SIST EN 60269-1:2007
(Main)Low-voltage fuses -- Part 1: General requirements
Low-voltage fuses -- Part 1: General requirements
This part of IEC 60269 is applicable to fuses incorporating enclosed current-limiting fuse-links with rated breaking capacities of not less than 6 kA, intended for protecting power-frequency a.c. circuits of nominal voltages not exceeding 1 000 V or d.c. circuits of nominal voltages not exceeding 1 500 V. Subsequent parts of this standard, referred to herein, cover supplementary requirements for such fuses intended for specific conditions of use or applications.
Niederspannungssicherungen -- Teil 1: Allgemeine Anforderungen
Fusibles basse tension -- Partie 1: Exigences générales
La présente partie de la CEI 60269 est applicable aux fusibles avec éléments de remplacement limiteurs de courant à fusion enfermée et à pouvoir de coupure égal ou supérieur à 6 kA, destinés à assurer la protection des circuits à courant alternatif à fréquence industrielle dont la tension nominale ne dépasse pas 1 000 V, ou des circuits à courant continu dont la tension nominale ne dépasse pas 1 500 V. Des parties subséquentes, auxquelles la présente norme se réfère, énoncent des exigences supplémentaires applicables aux fusibles prévus pour des conditions d'utilisation ou des applications particulières.
Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC 60269-1:2006)
Ta del IEC 60269 se uporablja za varovalke z zaprtimi tokovno-omejilnimi taljivimi vložki z naznačeno izklopno zmogljivostjo, ne manjšo od 6 kA, ki so namenjene za zaščito izmeničnih vezij z nazivnimi napetostmi, ne večjimi od 1 000 V, ali enosmernih vezij z nazivnimi napetostmi, ne večjimi od 1 500 V.
Naslednji deli tega standarda, navedeni v tem dokumentu, zajemajo dodatne zahteve za varovalke, namenjene za posebne pogoje uporabe ali aplikacije.
Taljivi vložki, namenjeni vključitvi v varovalčne-stikalne kombinacije v skladu z IEC 60947-3, morajo tudi ustrezati naslednjim zahtevam.
OPOMBA 1: O podrobnih lastnostih taljivih vložkov "a" (glej 2.2.4) v enosmernih vezjih naj se dogovorita uporabnik in proizvajalec.
OPOMBA 2: Spremembe in dopolnitve tega standarda, potrebne za nekatere vrste varovalk za posebne namene, na primer za nekatere varovalke za tirna vozila ali varovalke za visokofrekvenčna vezja, bodo zajete z ločenimi standardi, če bo to potrebno.
OPOMBA 3: Ta standard se ne uporablja za miniaturne varovalke, ki jih obravnava standard IEC 60127.
Namen tega standarda je določiti lastnosti varovalk ali delov varovalk (podstavka varovalke, nosilca varovalke, taljivega vložka) tako, da jih je mogoče nadomestiti z drugimi varovalkami ali deli varovalk, ki imajo zagotovljene enake lastnosti in so glede dimenzij zamenljive. V ta namen se ta standard nanaša zlasti na:
- naslednje lastnosti varovalk;
- njihove naznačene vrednosti,
- njihovo izolacijo,
- njihov dvig temperature v normalnem obratovanju,
- njihovo izgubno moč in sprejemljivo izgubno moč,
- njihove tokovno-časovne karakteristike,
- njihovo izklopno zmogljivost,
- njihove karakteristike odrezanih tokov in njihove karakteristike I2t;
- preskuse tipa za preverjanje lastnosti varovalk;
- označevanje varovalk.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2007
1DGRPHãþD
SIST EN 60269-1:2000
SIST EN 60269-1:2000/A1:2006
SIST EN 60269-2:1995
SIST EN 60269-2:1995/A1:1999
SIST EN 60269-2:1995/A2:2003
SIST EN 60269-3:1995
SIST EN 60269-3:1995/A1:2004
Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC 60269-1:2006)
Low-voltage fuses -- Part 1: General requirements (IEC 60269-1:2006)
Niederspannungssicherungen -- Teil 1: Allgemeine Anforderungen (IEC 60269-1:2006)
Fusibles basse tension -- Partie 1: Exigences générales (IEC 60269-1:2006)
Ta slovenski standard je istoveten z: EN 60269-1:2007
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 60269-1
NORME EUROPÉENNE
May 2007
EUROPÄISCHE NORM
ICS 29.120.50 Supersedes EN 60269-1:1998 + A1:2005, partially supersedes EN 60269-2:1995 + A1:1998 +
A2:2002 and EN 60269-3:1995 + A1:2003
English version
Low-voltage fuses -
Part 1: General requirements
(IEC 60269-1:2006)
Fusibles basse tension - Niederspannungssicherungen -
Partie 1: Exigences générales Teil 1: Allgemeine Anforderungen
(CEI 60269-1:2006) (IEC 60269-1:2006)
This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60269-1:2007 E
Foreword
The text of document 32B/483/FDIS, future edition 4 of IEC 60269-1, prepared by SC 32B, Low-voltage
fuses, of IEC TC 32, Fuses, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60269-1 on 2007-03-01.
This European Standard supersedes EN 60269-1:1998 + A1:2005, it also partially supersedes
EN 60269-2:1995 + A1:1998 + A2:2004 and EN 60269-3:1995 + A1:2003.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60269-1:2006 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60127 NOTE Harmonized in EN 60127 series (not modified).
IEC 60947-3 NOTE Harmonized as EN 60947-3:1999 (not modified).
__________
- 3 - EN 60269-1:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1)
IEC 60038 (mod) 1983 IEC standard voltages HD 472 S1 1989
+ corr. February 2002
IEC 60050-441 1984 International Electrotechnical Vocabulary - -
A1 2000 (IEV) -
Chapter 441: Switchgear, controlgear and
fuses
2) 3)
IEC 60269-2 - Low-voltage fuses - HD 60269-2 2007
Part 2: Supplementary requirements for fuses
for use by authorized persons (fuses mainly
for industrial application) - Examples of
standardized systems of fuses A to I
2) 3)
IEC 60269-3 - Low-voltage fuses - HD 60269-3 2007
Part 3: Supplementary requirements for fuses
for use by unskilled persons (fuses mainly for
household or similar applications) - Examples
of standardized systems of fuses A to F
2) 3)
IEC 60269-4 - Low-voltage fuses - EN 60269-4 2007
Part 4: Supplementary requirements for fuse-
links for the protection of semiconductor
devices
IEC 60364-3 (mod) 1993 Electrical installations of buildings - HD 384.3 S2 1995
Part 3: Assessment of general characteristics
IEC 60364-5-52 2001 Electrical installations of buildings - - -
Part 5-52: Selection and erection of electrical
equipment - Wiring systems
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993
1)
The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems.
2)
Undated reference.
3)
Valid edition at date of issue.
Publication Year Title EN/HD Year
IEC 60584-1 1995 Thermocouples - EN 60584-1 1995
Part 1: Reference tables
IEC 60617 data- Graphical symbols for diagrams - -
base
IEC 60664-1 1992 Insulation coordination for equipment within
+ A1 2000 low-voltage systems -
+ A2 2002 Part 1: Principles, requirements and tests EN 60664-1 2003
4)
IEC 60695-2-1/0 1994 Fire hazard testing - EN 60695-2-1/0 1996
Part 2: Test methods - Section 1/sheet 0:
Glow-wire test methods - General
5)
IEC 60695-2-1/1 1994 Fire hazard testing - EN 60695-2-1/1 1996
Part 2: Test methods -
Section 1/sheet 1: Glow-wire end-product test
and guidance
6)
IEC 60695-2-1/2 1994 Fire hazard testing - EN 60695-2-1/2 1996
Part 2: Test methods -
Section 1/sheet 2: Glow-wire flammability test
on materials
7)
IEC 60695-2-1/3 1994 Fire hazard testing - EN 60695-2-1/3 1996
Part 2: Test methods -
Section 1/sheet 3: Glow-wire ignitability test
on materials
ISO 3 1973 Preferred numbers - Series of preferred - -
numbers
ISO 478 1974 Paper - Untrimmed stock sizes for the ISO-A - -
series - ISO primary range
ISO 593 1974 Paper - Untrimmed stock size for the ISO-A - -
series - ISO supplementary range
ISO 4046 1978 Paper, board, pulp and related terms - - -
Vocabulary
4)
EN 60695-2-1/0 is superseded by EN 60695-2-10:2001, which is based on IEC 60695-2-10:2000.
5)
EN 60695-2-1/1 is superseded by EN 60695-2-11:2001, which is based on IEC 60695-2-11:2000.
6)
EN 60695-2-1/2 is superseded by EN 60695-2-12:2001, which is based on IEC 60695-2-12:2000.
7)
EN 60695-2-1/3 is superseded by EN 60695-2-13:2001, which is based on IEC 60695-2-13:2000.
INTERNATIONAL IEC
STANDARD 60269-1
Fourth edition
2006-11
Low-voltage fuses –
Part 1:
General requirements
” IEC 2006 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale XC
International Electrotechnical Commission
ɆɟɠɞɭɧɚɪɨɞɧɚɹɗɥɟɤɬɪɨɬɟɯɧɢɱɟɫɤɚɹɄɨɦɢɫɫɢɹ
For price, see current catalogue
60269-1 ¤ IEC:2006 – 3 –
CONTENTS
FOREWORD.9
INTRODUCTION.13
1 General .15
1.1 Scope and object.15
1.2 Normative references .17
2 Terms and definitions .19
2.1 Fuses and their component parts .19
2.2 General terms.21
2.3 Characteristic quantities .27
3 Conditions for operation in service .33
3.1 Ambient air temperature (T ) .33
a
3.2 Altitude.33
3.3 Atmospheric conditions.33
3.4 Voltage.35
3.5 Current.35
3.6 Frequency, power factor and time constant .35
3.7 Conditions of installation.35
3.8 Utilization category .35
3.9 Discrimination of fuse-links .37
4 Classification .37
5 Characteristics of fuses .37
5.1 Summary of characteristics.37
5.2 Rated voltage .39
5.3 Rated current .39
5.4 Rated frequency (see 6.1 and 6.2) .39
5.5 Rated power dissipation of a fuse-link and rated acceptable power dissipation
of a fuse-holder .41
5.6 Limits of time-current characteristics.41
5.7 Breaking range and breaking capacity.45
5.8 Cut-off current and I t characteristics.47
6 Markings.47
6.1 Markings of fuse-holders .47
6.2 Markings of fuse-links.49
6.3 Marking symbols.49
7 Standard conditions for construction .49
7.1 Mechanical design .49
7.2 Insulating properties and suitability for isolation.51
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of a fuse-holder .53
7.4 Operation .55
7.5 Breaking capacity .57
7.6 Cut-off current characteristic.57
7.7 I t characteristics .57
7.8 Overcurrent discrimination of fuse-links .59
7.9 Protection against electric shock.59
60269-1 ¤ IEC:2006 – 5 –
7.10 Resistance to heat.65
7.11 Mechanical strength.65
7.12 Resistance to corrosion .65
7.13 Resistance to abnormal heat and fire .65
7.14 Electromagnetic compatibility.65
8 Tests .67
8.1 General .67
8.2 Verification of the insulating properties and of the suitability for isolation .77
8.3 Verification of temperature rise and power dissipation.81
8.4 Verification of operation .87
8.5 Verification of the breaking capacity.97
8.6 Verification of the cut-off current characteristics. 109
8.7 Verification of I t characteristics and overcurrent discrimination . 109
8.8 Verification of the degree of protection of enclosures . 111
8.9 Verification of resistance to heat . 111
8.10 Verification of non-deterioration of contacts . 111
8.11 Mechanical and miscellaneous tests . 113
Annex A (informative) Measurement of short-circuit power factor. 139
Annex B (informative) Calculation of pre-arcing I t values for "gG", "gM", “gD” and
“gN” fuse-links and calculation of operating I t values at reduced voltage. 145
Annex C (informative) Calculation of cut-off current-time characteristic. 149
Annex D (informative) Effect of change of ambient temperature and surroundings on
the performance of fuse-links . 157
Figure 1 – Diagram illustrating the means of verification of the time-current
characteristic, using the results of the tests at the "gate" currents (example). 121
Figure 2 – Overload curve and time-current characteristic for "a" fuse-links . 123
Figure 3 – Time current zone for aM fuses. 125
Figure 4 – General presentation of the cut-off characteristics for a series of a.c. fuse-
links. 127
Figure 5 – Typical diagram of the circuit used for breaking capacity test (see 8.5). 129
Figure 6 – Interpretation of oscillograms taken during the a.c. breaking-capacity tests
(see 8.5.7) . 131
Figure 7 – Interpretation of oscillograms taken during the d.c. breaking-capacity tests
(see 8.5.7) . 133
Figure 8 – Glow-wire and position of the thermocouple . 135
Figure 9 –Test apparatus (example) . 137
Figure A.1 – Determination of circuit-impedance for calculation of power factor in
accordance with method I. 143
Figure C.1 – Cut-off current characteristic as a function of actual pre-arcing time . 155
60269-1 ¤ IEC:2006 – 7 –
Table 1 – Standard values of a.c. rated voltages for fuses .39
Table 2 – Conventional time and current for "gG" and "gM" fuse-links .43
a
Table 3 – Gates for specified pre-arcing times of "gG" and "gM" fuse-links .43
Table 4 – Gates for "aM ' fuse-links (all rated currents).45
Table 5 – Temperature rise limits ΔT = (T – T ) for contacts and terminals .53
a
Table 6 – Maximum arc voltage.57
Table 7 – Pre-arcing I t values at 0,01 s for "gG" and "gM" fuse-links .59
Table 8 – Rated impulse withstand voltage .61
Table 9 – Minimum clearances in air .61
Table 10 – Minimum creepage distances .63
Table 11 – Survey of complete tests on fuse-links and number of fuse-links to be tested .71
Table 12 – Survey of tests on fuse-links of smallest rated current of homogeneous
series and number of fuse-links to be tested.73
Table 13 – Survey of tests on fuse-links of rated currents between the largest and the
smallest rated current of a homogeneous series and number of fuse-links to be tested .75
Table 14 – Survey of complete tests on fuse-holders and number of fuse-holders to be
tested .75
Table 15 – Test voltage.79
Table 16 – Test voltage across the poles for the verification of the suitability for isolation .81
Table 17 – Cross-sectional area of copper conductors for tests corresponding to
Subclauses 8.3 and 8.4 .85
Table 18 – Cross-section areas of the copper conductors for the test of “aM” fuses .91
Table 19 – Table for test in Subclause 8.4.3.5 .95
Table 20 – Values for breaking-capacity tests on a.c. fuses . 101
Table 21 – Values for breaking capacity tests on d.c. fuses . 103
60269-1 ¤ IEC:2006 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
LOW-VOLTAGE FUSES –
Part 1: General requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60269-1 has been prepared by subcommittee 32B: Low-voltage
fuses, of IEC technical committee 32: Fuses.
This fourth edition cancels and replaces the third edition published in 1998 and amendment 1
(2005), as well as parts of IEC 60269-2 (1986) and IEC 60269-3 (1987) and constitutes a minor
revision.
The general re-organization of the IEC 60269 series has led to the creation of this new edition.
60269-1 ¤ IEC:2006 – 11 –
The text of this standard is based on following documents:
FDIS Report on voting
32B/483/FDIS 32B/490/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
IEC 60269 consists of the following parts, under the general title Low-voltage fuses:
Part 1: General requirements
NOTE This part includes IEC 60269-1 (third edition, 1998) and parts of IEC 60269-2 (second edition,
1986) and IEC 60269-3 (second edition, 1987).
Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for
industrial application) – Examples of standardized systems of fuses A to I
NOTE This part includes parts of IEC 60269-2 (second edition, 1986) and all of IEC 60269-2-1 (fourth
edition, 2004).
Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for
household or similar application) – Examples of standardized systems of fuses A to F
NOTE This part includes parts of IEC 60269-3 (second edition, 1987) and all of IEC 60269-3-1 (second
edition, 2004).
Part 4: Supplementary requirements for fuse-links for the protection of semiconductor devices
NOTE This part includes IEC 60269-4 (third edition, 1986) and IEC 60269-4-1 (first edition, 2002).
Part 5: Guidance for the application of low-voltage fuses
NOTE Currently IEC/TR 61818 (2003).
For reasons of convenience, when a part of this publication has come from other publications,
a remark to this effect has been inserted in the text.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60269-1 ¤ IEC:2006 – 13 –
INTRODUCTION
A reorganization of the different parts of the IEC 60269 series has been carried out, in order to
simplify its use, especially by the laboratories which test the fuses.
IEC 60269-1, IEC 60269-2, IEC 60269-3 and IEC 60269-3-1 have been integrated into either
the new part 1 or the new parts 2 or 3, according to the subjects considered, so that the
clauses which deal exclusively with “fuses for authorized persons” are separated from the
clauses dealing with “fuses for unauthorized persons”.
As far as IEC 60269-4 and IEC 60269-4-1 are concerned, they have been integrated into the
new part 4 which deals with the fuse-links used for semiconductor protection.
60269-1 ¤ IEC:2006 – 15 –
LOW-VOLTAGE FUSES –
Part 1: General requirements
1 General
1.1 Scope and object
This part of IEC 60269 is applicable to fuses incorporating enclosed current-limiting fuse-links
with rated breaking capacities of not less than 6 kA, intended for protecting power-frequency
a.c. circuits of nominal voltages not exceeding 1 000 V or d.c. circuits of nominal voltages not
exceeding 1 500 V.
Subsequent parts of this standard, referred to herein, cover supplementary requirements for
such fuses intended for specific conditions of use or applications.
Fuse-links intended to be included in fuse-switch combinations according to IEC 60947-3
should also comply with the following requirements.
NOTE 1 For "a" fuse-links, details of performance (see 2.2.4) on d.c. circuits should be subject to agreement
between user and manufacturer.
NOTE 2 Modifications of, and supplements to, this standard required for certain types of fuses for particular
applications – for example, certain fuses for rolling stock, or fuses for high-frequency circuits – will be covered, if
necessary, by separate standards.
NOTE 3 This standard does not apply to miniature fuses, these being covered by IEC 60127.
The object of this standard is to establish the characteristics of fuses or parts of fuses (fuse-
base, fuse-carrier, fuse-link) in such a way that they can be replaced by other fuses or parts of
fuses having the same characteristics provided that they are interchangeable as far as their
dimensions are concerned. For this purpose, this standard refers in particular to
– the following characteristics of fuses:
ƒ their rated values;
ƒ their insulation;
ƒ their temperature rise in normal service;
ƒ their power dissipation and acceptable power dissipation;
ƒ their time/current characteristics;
ƒ their breaking capacity;
ƒ their cut-off current characteristics and their I t characteristics.
– type test for verification of the characteristics of fuses;
– the marking of fuses.
60269-1 ¤ IEC:2006 – 17 –
1.2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 60038:1983, IEC standard voltages
IEC 60050(441):1984, International Electrotechnical Vocabulary (IEV) – Chapter 441:
Switchgear, controlgear and fuses
Amendment 1 (2000)
IEC 60269-2, Low-voltage fuses – Part 2: Supplementary requirements for fuses for use by
authorized persons (fuses mainly for industrial application) – Examples of standardized
systems of fuses A to I)
IEC 60269-3, Low-voltage fuses – Part 3: Supplementary requirements for fuses for use by
unskilled persons (fuses mainly for household or similar application) – Examples of
standardized systems of fuses A to F
IEC 60269-4, Low-voltage fuses – Part 4: Supplementary requirements for fuse-links for the
protection of semiconductor devices
IEC 60269-5, Low-voltage fuses – Part 5: Guidance for the application of low-voltage fuses
IEC 60364-3:1993, Electrical installations of buildings – Part 3: Assessment of general
characteristics
IEC 60364-5-52:2001, Electrical installations of buildings – Part 5-52: Selection and erection of
electrical equipment – Wiring system
IEC 60529:1989, Degrees of protection provided by enclosures (Code IP)
IEC 60584-1:1995, Thermocouples – Part 1: Reference tables
IEC 60617, Graphical symbols for diagrams
IEC 60664-1:2002, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-1/0:1994, Fire hazard testing – Part 2: Test methods – Section 1/sheet 0: Glow-
wire test methods – General
IEC 60695-2-1/1:1994, Fire hazard testing – Part 2: Test methods – Section 1/sheet 1: Glow-
wire end-product test and guidance
IEC 60695-2-1/2:1994, Fire hazard testing – Part 2: Test methods – Section 1/sheet 2: Glow-
wire flammability test on materials
IEC 60695-2-1/3:1994, Fire hazard testing – Part 2: Test methods – Section 1/sheet 3: Glow-
wire ignitability test on materials
60269-1 ¤ IEC:2006 – 19 –
ISO 3:1973, Preferred numbers – Series of preferred numbers
ISO 478:1974, Paper – Untrimmed stock sizes for the ISO-A series – ISO primary range
ISO 593:1974, Paper – Untrimmed stock size for the ISO-A series – ISO supplementary range
ISO 4046:1978, Paper, board, pulp and related terms – Vocabulary – Bilingual edition
2 Terms and definitions
NOTE For general definitions concerning fuses, see also IEC 60050-441.
For the purposes of this document, the following terms and definitions apply.
2.1 Fuses and their component parts
2.1.1
fuse
device that by the fusing of one or more of its specially designed and proportioned components
opens the circuit in which it is inserted by breaking the current when this exceeds a given value
for a sufficient time. The fuse comprises all the parts that form the complete device
[IEV 441-18-01]
2.1.2
fuse-holder
combination of the fuse-base with its fuse-carrier
NOTE Where, in this standard, the term "fuse-holder" is used, it covers fuse-bases and/or fuse-carriers, if no
clearer distinction is necessary.
[IEV 441-18-14]
2.1.2.1
fuse-base (fuse-mount)
fixed part of a fuse provided with contacts and terminals
[IEV 441-18-02]
NOTE Where applicable, covers are considered as part of the fuse-base.
2.1.2.2
fuse-carrier
movable part of a fuse designed to carry a fuse-link
[IEV 441-18-13]
2.1.3
fuse-link
part of a fuse including the fuse-element(s), intended to be replaced after the fuse has
operated
[IEV 441-18-09]
2.1.4
fuse-contact
two or more conductive parts designed to ensure circuit continuity between a fuse-link and the
corresponding fuse-holder
60269-1 ¤ IEC:2006 – 21 –
2.1.5
fuse-element
part of the fuse-link designed to melt under the action of current exceeding some definite value
for a definite period of time
[IEV 441-18-08]
NOTE The fuse-link may comprise several fuse-elements in parallel.
2.1.6
indicating device (indicator)
part of a fuse provided to indicate whether the fuse has operated
[IEV 441-18-17]
2.1.7
striker
mechanical device forming part of a fuse-link which, when the fuse operates, releases the
energy required to cause operation of other apparatus or indicators or to provide interlocking
[IEV 441-18-18]
2.1.8
terminal
conductive part of a fuse provided for electric connection to external circuits
NOTE Terminals may be distinguished according to the kind of circuits for which they are intended (for example,
main terminal, earth terminal, etc.) and also according to their design (for example, screw terminal, plug terminal,
etc.).
2.1.9
dummy fuse-link
test fuse-link with defined power dissipation and dimensions
2.1.10
test rig
defined test fuse-base
2.1.11
gauge-piece
additional part of a fuse-base intended to achieve a degree of non-interchangeability
2.2 General terms
2.2.1
enclosed fuse-link
fuse-link in which the fuse-element(s) is (are) totally enclosed, so that during operation within
its rating it cannot produce any harmful external effects, for example, due to development of an
arc, the release of gas or the ejection of flame or metallic particles
[IEV 441-18-12]
2.2.2
current-limiting fuse-link
fuse-link that during and by its operation in a specified current range, limits the current to a
substantially lower value than the peak value of the prospective current
[IEV 441-18-10]
60269-1 ¤ IEC:2006 – 23 –
2.2.3
"g" fuse-link
(full-range breaking-capacity fuse-link, formerly general purpose fuse-link)
current-limiting fuse-link capable of breaking under specified conditions all currents, which
cause melting of the fuse-element up to its rated breaking capacity
2.2.4
"a" fuse-link
(partial-range breaking-capacity fuse-link, formerly back-up fuse-link)
current-limiting fuse-link capable of breaking under specified conditions all currents between
the lowest current indicated on its operating time-current characteristic (k I in Figure 2) and its
2 n
rated breaking capacity
NOTE "a" fuse-links are generally used to provide short-circuit protection. Where protection is required against
over-currents less than k I in Figure 2, they are used in conjunction with another suitable switching device
2 n
designed to interrupt such small overcurrents.
2.2.5
temperatures
2.2.5.1
ambient air temperature
T
a
the temperature of the air surrounding the fuse (at a distance of about 1 m from the fuse or its
enclosure, if any)
2.2.5.2
fluid environment temperature
T
e
temperature of the fluid cooling the fuse-components (contact, terminal, etc.). It is the sum of
the ambient air temperature T and the temperature rise ΔT with respect to the ambient
a e
temperature of the internal fluid in contact with the fuse-components (contact, terminal, etc.) if
the latter is in an enclosure. If it is not in an enclosure, it is assumed that T is equal to T
e a
2.2.5.3
fuse-component temperature
T
fuse-component (contact, terminal, etc.) temperature T is that of the relevant part
2.2.6
overcurrent discrimination
coordination of the relevant characteristics of two or more overcurrent protective devices such
that, on the occurrence of overcurrents within stated limits, the device intended to operate
within these limits does so, while the other(s) do(es) not
2.2.7
fuse system
family of fuses following the same physical design principles with respect to the shape of the
fuse-links, type of contact, etc.
60269-1 ¤ IEC:2006 – 25 –
2.2.8
size
specified set of dimensions of fuses within a fuse system. Each individual size covers a given
range of rated currents for which the specified dimensions of the fuses remain unchanged
2.2.9
homogeneous series of fuse-links
series of fuse-links, within a given size, deviating from each other only in such characteristics
that for a given test, the testing of one or a reduced number of particular fuse-links of that
series may be taken as representative for all the fuse-links of the homogeneous series
NOTE The characteristics by which the fuse-links of a homogeneous series may deviate and details on which of
the fuse-links shall be tested are specified in association with the tests concerned (see Tables 12 and 13).
[IEV 441-18-34, modified]
2.2.10
utilization category (of a fuse-link)
combination of specified requirements related to the conditions in which the fuse-link fulfils its
purpose, selected to represent a characteristic group of practical applications (see 5.7.1)
2.2.11
fuses for use by authorized persons
(formerly called fuses for industrial application)
fuses intended to be used in installations where the fuse-links are accessible to and intended
to be replaced by authorized persons only
NOTE 1 Non-interchangeability and protection against accidental contact with live parts need not necessarily be
ensured by constructional means.
NOTE 2 Authorized person is understood to have the meaning defined for categories BA 4 "instructed" and BA 5
"skilled" in IEC 60364-3.
2.2.12
fuses for use by unskilled persons (formerly called fuses for domestic and similar
applications)
fuses intended to be used in installations where the fuse-links are accessible to, and can be
replaced by, unskilled persons
NOTE For these fuses, protection against direct contact with live parts is recommended and non-interchangeability
may be required, if necessary
2.2.13
non-interchangeability
limitations on shape and/on dimensions with the object of avoiding in a specific fuse-base the
inadvertent use of fuse-links having electrical properties other than those ensuring the desired
degree of protection
[IEV 441-18-33]
___________
Instructed: Persons adequately advised or supervised by skilled persons to enable them to avoid dangers which
electricity may create (operating and maintenance staff).
Skilled: Persons with technical knowledge or sufficient experience to enable them to avoid dangers which
electricity may create (engineers and technicians).
60269-1 ¤ IEC:2006 – 27 –
2.3 Characteristic quantities
2.3.1
rating
general term employed to designate the characteristic values that together define the working
conditions upon which the tests are based and for which the equipment is designed
[IEV 441-18-36]
NOTE Rated values usually stated for low-voltage fuses are: voltage, current, breaking capacity, power dissipation
and acceptable power dissipation, and frequency, where applicable. In the case of a.c., rated voltage and rated
current are stated as r.m.s. symmetrical values; in the case of d.c., when ripple is present, the rated voltage is
stated as a mean value, the rated current as an r.m.s. value. The above applies to any value of voltage and current,
if not indicated otherwise.
2.3.2
prospective current (of a circuit and with respect to a fuse)
current that would flow in the circuit if each pole of the fuse were replaced by a conductor of
negligible impedance.
For a.c., the prospective current is expressed by the r.m.s. value of the a.c. component
NOTE The prospective current is the quantity to which the breaking capacity and characteristics of the fuse are
normally referred, e.g. I t and cut-off current characteristics (see 8.5.7).
[IEV 441-17-01 modified]
2.3.3
gates
limiting values within which the characteristics, for example time-current characteristics, are
obtained
2.3.4
breaking capacity of a fuse
value of prospective current that a fuse is capable of breaking at a stated voltage under
prescribed conditions of use and behaviour
[IEV 441-17-08 modified]
2.3.5
breaking range
breaking range is a range of prospective currents within which the breaking capacity of a fuse-
link is assured
2.3.6
cut-off current
maximum instantaneous value reached by the current during the breaking operation of a fuse-
link when it operates in such a manner as to prevent the current from reaching the otherwise
attainable maximum
2.3.7
cut-off current characteristic; let-through current characteristic
curve giving the cut-off current as a function of the prospective current under stated conditions
of operation
NOTE In the case of a.c., the values of the cut-off currents are the maximum values which can be reached
whatever the degree of asymmetry. In the case of d.c., the values of the cut-off currents are the maximum values
reached related to the time constants as specified.
[IEV 441-17-14]
60269-1 ¤ IEC:2006 – 29 –
2.3.8
peak withstand current (of a fuse-holder)
value of cut-off current that the fuse-holder can withstand
NOTE The peak withstand current is not less than the highest cut-off current of any fuse-link with which the
fuseholder is intended to be associated.
2.3.9
pre-arcing time; melting time
interval of time between the beginning of a current large enough to cause a break in the fuse-
element(s) and the instant when an arc is initiated
[IEV 441-18-21]
2.3.10
arcing time of a fuse
interval of time between the instant of the initiation of the arc in a fuse and the instant of final
arc extinction in that fuse
[IEV 441-17-37 modified]
2.3.11
operating time; total clearing time
sum of the pre-arcing time and the arcing time
[IEV 441-18-22]
2.3.12
I t; Joule integral
integral of the square of the current over a given time interval:
t
2 2
I t = i dt
³
t
2 2
NOTE 1 The pre-arcing I t is the I t integral extended over the pre-arcing time of the fuse.
2 2
NOTE 2 The operating I t is the I t integral extended over the operating time of the fuse.
NOTE 3 The energy, in joules, released in 1 Ω of resistance in a circuit protected by a fuse is equal to the value of
2 2
the operating I t expressed in A s.
[IEV 441-18-23]
2.3.13
I t characteristic
2 2 2
curve giving I t values (pre-arcing I t and/or operating I t) as a function of prospective current
under stated conditions of operation
2.3.14
I t zone
2 2
range contained by the minimum pre-arcing I t characteristic and the maximum operating I t
characteristic, under specified conditions
2.3.15
rated current of a fuse-link
I
n
value of current that the fuse-link can carry continuous
...
SLOVENSKI SIST EN 60269-1
STANDARD
november 2007
Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC 60269-1:2006)
Low-voltage fuses – Part 1: General requirements (IEC 60269-1:2006)
Fusibles basse tension – Partie 1: Exigences générales (CEI 60269-1:2006)
Niederspannungssicherungen – Teil 1: Allgemeine Anforderungen
(IEC 60269-1:2006)
Referenčna oznaka
ICS 29.120.50 SIST EN 60269-1:2007 (sl)
Nadaljevanje na straneh II in III ter od 1 do 78
© 2016-07. Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN 60269-1 : 2007
NACIONALNI UVOD
Standard SIST EN 60269-1:2007 (sl), Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC
60269-1:2006), ima status slovenskega standarda in je enakovreden evropskemu standardu EN
60269-1:2007 (en), Low-voltage fuses – Part 1: General requirements (IEC 60269-1:2006), 2007-05.
NACIONALNI PREDGOVOR
Mednarodni standard IEC 60269-1:2006 je pripravil tehnični pododbor Mednarodne elektrotehniške
komisije IEC/SC 32B Nizkonapetostne varovalke, potrdil pa odbor Mednarodne elektrotehniške
komisije IEC 32 Varovalke. Vzporedno je standard potrdil tehnični odbor Evropskega komiteja za
standardizacijo v elektrotehniki CLC/TC 32 Varovalke, katerega tajništvo vodi DKE.
Slovenski standard SIST EN 60269-1:2007 je prevod evropskega standarda EN 60269-1:2007. V
primeru spora glede besedila slovenskega prevoda v tem standardu je odločilen izvirni evropski
standard v angleškem jeziku. Slovensko izdajo standarda je pripravil tehnični odbor SIST/TC EVA
Električne varovalke.
Odločitev za privzem tega standarda je 7. novembra 2007 sprejel tehnični odbor SIST/TC EVA
Električne varovalke.
TERMINOLOGIJA
V terminološki bazi IEC – Elektropediji se po skupini terminoloških standardov IEC 60050 uvajata
naslednja prevoda izrazov:
angl. nominal value, fr. valeur nominale, nem. Nennwert
nazivna vrednost: primerna približna vrednost veličine za opis ali prepoznavo sestavine, naprave,
stroja ali opreme (angl. a suitable approximate quantity value used to designate or identify a
component, device or equipment)
angl. rated value, fr. valeur assignée, nem. Bemessungswert
naznačena vrednost: vrednost veličine, ki jo navede proizvajalec za določene obratovalne pogoje
sestavine, naprave ali opreme (angl. a quantity value assigned, generally by a manufacturer, for a
specified operating condition of a component, device or equipment)
ZVEZA Z NACIONALNIMI STANDARDI
S privzemom tega evropskega standarda veljajo za omejeni namen referenčnih standardov vsi
standardi, navedeni v izvirniku, razen tistih, ki so že sprejeti v nacionalno standardizacijo:
SIST EN 60038:1996 Standardne napetosti IEC (nadomeščen s SIST EN 60038:2011)
SIST HD 60269-2 Nizkonapetostne varovalke – 2. del: Dodatne zahteve za varovalke, ki jih
uporabljajo strokovne osebe (uporaba varovalk zlasti v industriji) –
Primeri tipov standardiziranih varovalk od A do K
SIST HD 60269-3 Nizkonapetostne varovalke – 3. del: Dodatne zahteve za varovalke, ki jih
uporabljajo nestrokovne osebe (uporaba varovalk zlasti v gospodinjstvu
in podobnih okoljih) – Razdelki od A do F: Primeri tipov standardiziranih
varovalk
SIST EN 60269-4 Nizkonapetostne varovalke – 4. del: Dodatne zahteve za taljive vložke za
zaščito polprevodniških naprav
SIST-TP CLC/TR 60269-5 Nizkonapetostne varovalke – 5. del: Navodila za uporabo nizkonape-
tostnih varovalk
SIST HD 384.3 S2:2000 Električne inštalacije zgradb – 3. del: Ocena splošnih karakteristik
SIST IEC 60364-5-52:2006 Električne inštalacije zgradb – 5-52. del: Izbira in namestitev električne
opreme – Inštalacijski sistemi
II
SIST EN 60269-1 : 2007
SIST EN 60529:1997 Stopnja zaščite, ki jo zagotavlja ohišje (koda IP)
SIST EN 60584-1:1998 Termočleni – 1. del: Specifikacije potencialov (EMF) in tolerance
SIST EN 60617 Grafični simboli za sheme
SIST EN 60664-1:2004 Uskladitev izolacije za opremo v okviru nizkonapetostnih sistemov –
1. del: Načela, zahteve in preskusi
SIST EN 60695-2-1/0:1999 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek
1/list 0: Preskusne metode z žarilno žico – Splošno (nadomeščen s SIST
EN 60695-2-10:2013)
SIST EN 60695-2-1/1:1999 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek
1/list 1: Preskus končnega proizvoda z žarilno žico in navodilo
(nadomeščen s SIST EN 60695-2-11:2014)
SIST EN 60695-2-1/2:1999 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek
1/list 2: Preskus vnetljivosti materialov z žarilno žico (nadomeščen s SIST
EN 60695-2-12:2011)
SIST EN 60695-2-1/3:1999 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek
1/list 3: Preskus vžigljivosti materialov z žarilno žico (nadomeščen s SIST
EN 60695-2-13:2011)
SIST ISO 3:1995 Standardna števila – Standardne vrste števil
SIST EN ISO 217:2013 Papir – Neobrezane pole – Označevanje in dovoljena odstopanja za
osnovne in dopolnilne formate ter navedba vzdolžne smeri vlaken v
papirju (MD) (ISO 217:2013) (nadomestil ISO 478:1974)
SIST ISO 4046 Papir, karton, lepenka, vlaknine in izdelki iz teh materialov – Slovar
(razveljavljen)
OSNOVA ZA IZDAJO STANDARDA
– privzem standarda EN 60269-1:2007
PREDHODNA IZDAJA
– SIST EN 60269-1:2000, Low-voltage fuses – Part 1: General requirements (IEC 60269-1:1998)
– SIST EN 60269-1:2000/A1:2006, Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC
60269-1:1998/A1:2005)
OPOMBE
– Povsod, kjer se v besedilu standarda uporablja izraz "evropski" ali "mednarodni" standard, v
– Nacionalni uvod in nacionalni predgovor nista sestavni del standarda.
– Ta nacionalni dokument je enakovreden EN 60269-1:2007 in je objavljen z dovoljenjem
CEN/CENELEC
Rue de Stassart 36
1050 Bruselj
Belgija
This national document is identical with EN 60269-1:2007 and is published with the permission of
CEN /CENELEC
Rue de Stassart, 36
1050 Bruxelles
Belgium
III
EVROPSKI STANDARD EN 60269-1
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM maj 2007
ICS: 29.120.50 Nadomešča EN 60269-1:1998 + A1:2005; delno nadomešča EN 60269-2:1995
+ A1:1998 + A2:2002 in EN 60269-3:1995 + A1:2003
Slovenska izdaja
Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC 60269-1:2006)
Low-voltage fuses – Fusibles basse tension – Niederspannungssicherungen –
Part 1: General requirements Partie 1: Exigences générales Teil 1: Allgemeine Anforderungen
(IEC 60269-1:2006) (CEI 60269-1:2006) (IEC 60269-1:2006)
Ta evropski standard je CENELEC sprejel 1. marca 2007. Člani CENELEC morajo izpolnjevati
notranje predpise CEN/CENELEC, s katerimi so predpisani pogoji za privzem tega evropskega
standarda na nacionalno raven brez kakršnihkoli sprememb.
Najnovejši seznami teh nacionalnih standardov z njihovimi bibliografskimi podatki se na zahtevo lahko
dobijo pri Centralnem sekretariatu ali kateremkoli članu CENELEC.
Ta evropski standard obstaja v treh uradnih izdajah (angleški, francoski in nemški). Izdaje v drugih
jezikih, ki jih člani CENELEC na lastno odgovornost prevedejo in izdajo ter prijavijo pri Centralnem
sekretariatu, veljajo kot uradne izdaje.
Člani CENELEC so nacionalni elektrotehniški komiteji Avstrije, Belgije, Bolgarije, Cipra, Češke
republike, Danske, Estonije, Finske, Francije, Grčije, Islandije, Irske, Italije, Latvije, Litve,
Luksemburga, Madžarske, Malte, Nemčije, Nizozemske, Norveške, Poljske, Portugalske, Romunije,
Slovaške, Slovenije, Španije, Švedske in Združenega kraljestva.
CENELEC
Evropski komite za standardizacijo v elektrotehniki
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Centralni sekretariat: Rue de Stassart 35, B-1050 Bruselj
© 2007 CENELEC Lastnice avtorskih pravic so vse države članice CENELEC. Ref. št. EN 60269-1:2007 E
SIST EN 60269-1 : 2007
VSEBINA Stran
Predgovor k evropskemu standardu . 5
Dodatek ZA (normativni): Sklicevanje na mednarodne publikacije z njihovimi ustreznimi
evropskimi publikacijami . 6
Predgovor k mednarodnemu standardu . 8
Uvod . 10
1 Splošno . 11
1.1 Področje uporabe in predmet standarda . 11
1.2 Zveze s standardi . 11
2 Izrazi in definicije . 12
3 Pogoji za delovanje in uporabo . 19
3.1 Temperatura zraka okolice (T ) . 19
a
3.2 Nadmorska višina . 19
3.3 Atmosferske razmere . 20
3.4 Napetost . 20
3.5 Tok . 20
3.6 Frekvenca, faktor moči in časovna konstanta . 20
3.7 Pogoji za vgradnjo . 20
3.8 Kategorija uporabe . 20
3.9 Selektivnost taljivih vložkov . 21
4 Razvrstitev . 21
5 Karakteristike varovak . 21
5.1 Povzetek karakteristik . 21
5.2 Naznačena napetost . 21
5.3 Naznačeni tok . 22
5.4 Naznačena frekvenca . 22
5.5 Naznačena izgubna moč taljivega vložka in naznačena sprejemljiva izgubna moč držala
varovalke . 22
5.6 Meje tokovno-časovne karakteristike . 22
5.7 Prekinitveno območje in izklopna zmogljivost . 24
5.8 Karakteristike odrezanih tokov in karakteristike I t . 25
6 Označevanje . 26
6.1 Označevanje držal varovalke . 26
6.2 Označevanje taljivih vložkov . 26
6.3 Simboli za označevanje . 26
7 Standardni konstrukcijski pogoji . 27
7.1 Mehanska konstrukcija . 27
7.2 Izolacijske lastnosti in primernost za galvansko ločitev . 28
7.3 Dvig temperature, izgubna moč taljivega vložka in sprejemljiva izgubna moč držala
varovalke . 28
7.4 Delovanje . 29
7.5 Izklopna zmogljivost . 30
7.6 Karakteristike odrezanega toka . 30
7.7 Karakteristike I t . 31
7.8 Nadtokovna selektivnost taljivih vložkov . 31
7.9 Zaščita pred električnim udarom . 31
SIST EN 60269-1 : 2007
7.10 Odpornost proti segrevanju . 34
7.11 Mehanska trdnost . 34
7.12 Odpornost proti koroziji. 34
7.13 Odpornost proti neobičajnim temperaturam in ognju . 34
7.14 Elektromagnetna združljivost . 34
8 Preskusi . 34
8.1 Splošno . 34
8.2 Preverjanje izolacijskih lastnosti in primernosti za galvansko ločitev . 40
8.3 Preverjanje dviga temperature in izgubne moči . 42
8.4 Preverjanje delovanja . 45
8.5 Preverjanje izklopne zmogljivosti . 49
8.6 Preverjanje karakteristik odrezanega toka . 54
8.7 Preverjanje karakteristik I t in nadtokovne selektivnosti . 55
8.8 Preverjanje stopnje zaščite ohišij . 55
8.9 Preverjanje odpornosti proti vročini . 55
8.10 Preverjanje neposlabšanja kontaktov . 55
8.11 Mehanski in drugi preskusi . 56
Dodatek A (informativni): Merjenje kratkostičnega faktorja moči . 69
Dodatek B (informativni): Izračun vrednosti talilnega I t za taljive vložke "gG", "gM", "gD" in
"gN" ter izračun celotnih vrednosti I t pri znižani napetosti . 72
Dodatek C (informativni): Izračun tokovno-časovnih karakteristik odrezanega toka . 73
Dodatek D (informativni): Vpliv spremembe temperature okolice na lastnosti taljivih vložkov . 77
Literatura. 78
Preglednica 1: Standardne vrednosti izmeničnih naznačenih napetosti za varovalke . 22
Preglednica 2: Konvencionalni časi in toki za taljive vložke "gG" in "gM" . 23
Preglednica 3: Meje za določene talilne čase taljivih vložkov "gG" in "gM" . 24
Preglednica 4: Območje mejnih vrednosti za taljive vložke "aM" (vsi naznačeni toki) . 24
Preglednica 5: Meje dviga temperature ΔT = (T – T ) za kontakte in priključke . 29
a
Preglednica 6: Najvišje obločne napetosti . 30
Preglednica 7: Vrednosti talilnega I t pri 0,01 s za taljive vložke "gG" in "gM" . 31
Preglednica 8: Naznačena udarna zdržna napetost . 32
Preglednica 9: Najkrajše izolacijske razdalje na zraku . 32
Preglednica 10: Najkrajše plazilne razdalje . 33
Preglednica 11: Pregled vseh preskusov taljivih vložkov in število taljivih vložkov, ki se
preskusijo . 37
Preglednica 12: Pregled preskusov taljivih vložkov z najmanjšimi naznačenimi toki
v homogeni vrsti in število taljivih vložkov, ki se preskusijo . 38
Preglednica 13: Pregled preskusov taljivih vložkov z naznačenimi toki med največjim in
najmanjšim naznačenim tokom v homogeni vrsti in število taljivih vložkov, ki se preskusijo . 39
Preglednica 14: Pregled vseh preskusov držal varovalk in število držal varovalk, ki se
preskusijo . 39
Preglednica 15: Preskusne napetosti . 41
Preglednica 16: Preskusna napetost med poli za preverjanje primernosti za galvansko ločitev . 42
Preglednica 17: Prerezi bakrenih vodnikov za preskuse po točkah 8.3 in 8.4 . 44
Preglednica 18: Prerezi bakrenih vodnikov za preskus varovalk "aM" . 47
Preglednica 19: Preglednica za preskus v točki 8.4.3.5 . 48
SIST EN 60269-1 : 2007
Preglednica 20: Vrednosti za preskuse izklopne zmogljivosti izmeničnih varovalk . 51
Preglednica 21: Vrednosti za preskuse izklopne zmogljivosti enosmernih varovalk . 52
Slika 1: Diagram prikazuje način preverjanja tokovno-časovne karakteristike s prikazom
rezultatov preskusov pri mejnih tokih (primer) . 60
Slika 2: Krivulja preobremenitve in tokovno-časovne karakteristike za taljive vložke tipa "a" . 61
Slika 3: Tokovno-časovno območje za varovalke aM . 62
Slika 4: Splošna predstavitev karakteristik odrezanih tokov za izmenične taljive vložke tipa "a" . 63
Slika 5: Tipičen diagram tokokroga za preskus izklopne zmogljivosti . 64
Slika 6: Razlaga oscilogramov, pridobljenih med preskusom izmenične izklopne zmogljivosti . 65
Slika 7: Razlaga oscilogramov, pridobljenih med preskusom enosmerne izklopne zmogljivosti . 66
Slika 8: Žarilna žica in pozicija termočlena . 67
Slika 9: Preskusna naprava (primer) . 68
Slika A.1: Določitev impedance tokokroga za izračun faktorja moči po metodi I . 71
Slika C.1: Karakteristike odrezanega toka kot funkcija dejanskega talilnega časa . 76
SIST EN 60269-1 : 2007
Predgovor k evropskemu standardu
Besedilo dokumenta 32B/483/FDIS, prihodnje 4. izdaje IEC 60269-1, ki ga je pripravil pododbor SC
32B Nizkonapetostne varovalke pri tehničnem odboru IEC/TC 32 Varovalke, je CENELEC 1. marca
2007 po vzporednem glasovanju v IEC in CENELEC sprejel kot EN 60269-1.
Ta evropski standard nadomešča EN 60269-1:1998 + A1:2005; delno nadomešča EN 60269-2:1995 +
A1:1998 + A2:2002 in EN 60269-3:1995 + A1:2003.
Določena sta bila naslednja datuma:
– zadnji datum, do katerega mora EN dobiti status
nacionalnega standarda bodisi z objavo istovetnega besedila
ali z razglasitvijo (dop) 2008-03-01
– zadnji datum, ko je treba razveljaviti nacionalne standarde,
ki so z EN v nasprotju (dow) 2010-03-01
Dodatek ZA je dodal CENELEC.
Razglasitvena objava
Besedilo mednarodnega standarda IEC 60269-1:2006 je CENELEC odobril kot evropski standard brez
kakršnihkoli sprememb.
V uradni verziji je treba v Literaturi dodati opombe k naslednjima standardoma:
IEC 60127 OPOMBA Harmoniziran s skupino standardov 60127 (nespremenjen)
IEC 60947-3 OPOMBA Harmoniziran kot EN 60947-3:1999 (nespremenjen)
SIST EN 60269-1 : 2007
Dodatek ZA
(normativni)
Sklicevanje na mednarodne publikacije z njihovimi ustreznimi evropskimi
publikacijami
Pri uporabi tega dokumenta so nujno potrebni naslednji referenčni dokumenti. Pri datiranih
sklicevanjih velja le navedena izdaja dokumenta. Pri nedatiranih sklicevanjih se uporablja zadnja
izdaja publikacije (vključno z dopolnili).
OPOMBA: Kadar je mednarodna publikacija spremenjena in so spremembe označene z (mod), se uporablja ustrezni
dokument EN/HD.
Zamenjati sklicevanja na
Standard Leto Naslov EN/HD Leto
1)
IEC 60038 (mod) 1983 Standardne napetosti IEC HD 472 S1 1989
+ corr. februar 2002
Mednarodni elektrotehniški slovar – Poglavje 441:
IEC 60050-441 1984 – –
Stikalne naprave in varovalke
A1 2000
2) 3)
IEC 60269-2 – Nizkonapetostne varovalke – HD 60269-2 2007
2. del: Dodatne zahteve za varovalke, ki jih
uporabljajo strokovne osebe (uporaba
varovalk zlasti v industriji) – Primeri tipov
standardiziranih varovalk od A do I
2) 3
IEC 60269-3 – Nizkonapetostne varovalke – HD 60269-3 2007
3. del: Dodatne zahteve za varovalke, ki jih
uporabljajo nestrokovne osebe (uporaba
varovalk zlasti v gospodinjstvu in podobnih
okoljih) – Primeri tipov standardiziranih
varovalk od A do F
2) 3
IEC 60269-4 – Nizkonapetostne varovalke – EN 60269-4 2007
4. del: Dodatne zahteve za taljive vložke za
zaščito polprevodniških naprav
IEC 60364-3 (mod) 1993 Električne inštalacije zgradb – HD 384.3 S2 1995
3. del: Ocena splošnih karakteristik
IEC 60364-5-52 2001 Električne inštalacije zgradb – – –
5-52. del: Izbira in namestitev električne
opreme – Inštalacijski sistemi
IEC 60529 1989 Stopnja zaščite, ki jo zagotavlja ohišje EN 60529 1991
(koda IP)
+ corr. maj 1993
IEC 60584-1 1995 Termočleni – 1. del: Referenčne tablice EN 60584-1 1995
1)
Naslov HD 472 S1 is: Nazivne napetosti za javna nizkonapetostna električna omrežja.
2)
Dedatirano sklicevanje.
3)
Veljavna izdaja na datum izida.
SIST EN 60269-1 : 2007
Standard Leto Naslov EN/HD Leto
IEC 60617 baza Grafični simboli za sheme – –
IEC 60664-1 1992 Uskladitev izolacije za opremo v okviru EN 60664-1 2003
nizkonapetostnih sistemov – 1. del: Načela,
+ A1 2000
zahteve in preskusi
+ A2 2002
4)
IEC 60695-2-1/0 1994 Preskušanje požarne ogroženosti – 2. del: EN 60695-2-1/0 1996
Preskusne metode – Oddelek 1/list 0:
Preskusne metode z žarilno žico – Splošno
5)
IEC 60695-2-1/1 1994 Preskušanje požarne ogroženosti – 2. del: EN 60695-2-1/1 1996
Preskusne metode – Oddelek 1/list 1:
Preskus končnega proizvoda z žarilno žico
in navodilo
6)
IEC 60695-2-1/2 1994 Preskušanje požarne ogroženosti – 2. del: EN 60695-2-1/2 1996
Preskusne metode – Oddelek 1/list 2:
Preskus vnetljivosti materialov z žarilno
žico
7)
IEC 60695-2-1/3 1994 Preskušanje požarne ogroženosti – 2. del: EN 60695-2-1/3 1996
Preskusne metode – Oddelek 1/list 3:
Preskus vžigljivosti materialov z žarilno
žico
ISO 3 1973 Standardna števila - Standardne vrste – –
števil
ISO 478 1974 Papir – Velikosti neobrezanih pol za – –
formate ISO-A – Osnovni format ISO
ISO 593 1974 Papir – Velikosti neobrezanih pol za – –
formate ISO-A – Dopolnilni format ISO
ISO 4046 1978 Papir, karton, lepenka, vlaknine in izdelki iz – –
teh materialov – Slovar
4)
EN 60695-2-1/0 je nadomeščen z EN 60695-2-10:2001, ki temelji na IEC 60695-2-10:2000.
5)
EN 60695-2-1/1 je nadomeščen z EN 60695-2-11:2001, ki temelji na IEC 60695-2-11:2000.
6)
EN 60695-2-1/2 je nadomeščen z EN 60695-2-12:2001, ki temelji na IEC 60695-2-12:2000.
7)
EN 60695-2-1/3 je nadomeščen z EN 60695-2-13:2001, ki temelji na IEC 60695-2-13:2000.
SIST EN 60269-1 : 2007
MEDNARODNA ELEKTROTEHNIŠKA KOMISIJA
Nizkonapetostne varovalke –
1. del: Splošne zahteve
Predgovor k mednarodnemu standardu
1) IEC (Mednarodna elektrotehniška komisija) je svetovna organizacija za standardizacijo, ki združuje vse nacionalne
elektrotehnične komiteje (nacionalni komiteji IEC). Cilj IEC je pospeševati mednarodno sodelovanje v vseh vprašanjih
standardizacije s področja elektrotehnike in elektronike. V ta namen poleg drugih aktivnosti izdaja mednarodne standarde,
tehnične specifikacije, tehnična poročila, javnosti dostopne specifikacije (PAS) in vodila (v nadaljevanju: publikacije IEC). Za
njihovo pripravo so odgovorni tehnični odbori. Vsak nacionalni komite IEC, ki ga zanima obravnavana tema, lahko sodeluje
v tem pripravljalnem delu. Prav tako lahko v pripravi sodelujejo mednarodne organizacije ter vladne in nevladne ustanove, ki
so povezane z IEC. IEC deluje v tesni povezavi z mednarodno organizacijo za standardizacijo ISO skladno s pogoji,
določenimi v soglasju med obema organizacijama.
2) Uradne odločitve ali sporazumi IEC o tehničnih vprašanjih, pripravljeni v tehničnih odborih, v katerih so prisotni vsi
nacionalni komiteji, ki jih tema zanima, izražajo, kolikor je mogoče, mednarodno soglasje o obravnavani temi.
3) Publikacije IEC imajo obliko priporočil za njihovo uporabo na mednarodni ravni in jih kot takšne sprejmejo nacionalni
komiteji IEC. Čeprav IEC skuša na vse primerne načine zagotavljati točnost tehničnih vsebin v publikacijah IEC, IEC ne
more biti odgovoren za način, kako se določila uporabljajo, ter za morebitne napačne razlage končnih uporabnikov.
4) Da bi pospeševali mednarodno poenotenje, so se nacionalni komiteji IEC zavezali, da bodo v svojih nacionalnih in
regionalnih standardih čim pregledneje uporabljali mednarodne standarde. Vsako odstopanje med standardom IEC in
ustreznim nacionalnim ali regionalnim standardom je treba v slednjem jasno označiti.
5) IEC ni določil nobenega postopka označevanja, ki bi kazal na njegovo potrditev in ne more biti odgovoren za katero koli
opremo, ki bi bila deklarirana kot skladna z eno od njegovih publikacij.
6) Vsi uporabniki naj bi si zagotovili zadnjo izdajo teh publikacij.
7) IEC ali njegovi direktorji, zaposleni, uslužbenci ali agenti, vključno s samostojnimi strokovnjaki ter člani tehničnih odborov in
nacionalnih komitejev IEC, ne prevzemajo nobene odgovornosti za kakršno koli osebno poškodbo, škodo na premoženju ali
katero koli drugo škodo kakršne koli vrste, bodisi posredne ali neposredne, ali za stroške (vključno z zakonitim lastništvom)
in izdatke, povezane s publikacijo, njeno uporabo ali zanašanjem na to publikacijo IEC ali katero koli drugo publikacijo IEC.
8) Pozornost je treba posvetiti normativnim virom, na katere se sklicuje ta publikacija. Uporaba navedenih publikacij je nujna
za pravilno uporabo te publikacije.
9) Opozoriti je treba na možnost, da bi lahko bil kateri od elementov tega mednarodnega standarda predmet patentnih pravic.
IEC ni odgovoren za identificiranje nobene od teh patentnih pravic.
Mednarodni standard IEC 60269-1 je pripravil pododbor 32B Nizkonapetostne varovalke pri tehničnem
odboru IEC/TC 32 Varovalke.
Ta četrta izdaja razveljavlja in nadomešča tretjo izdajo, objavljeno v letu 1998 in dopolnilo A1 (2005)
ter tudi dele standardov IEC 60269-2 (1986) in IEC 60269-3 (1987) in pomeni večjo tehnično
spremembo.
Splošna reorganizacija skupine standardov IEC 60269 je vodila k oblikovanju nove izdaje.
Besedilo tega standarda je osnovano na naslednjih dokumentih:
FDIS Poročilo o glasovanju
32B/483/FDIS 32B/490/RVD
SIST EN 60269-1 : 2007
Vse informacije o glasovanju za potrditev tega standarda lahko najdete v poročilu o glasovanju,
navedenem v gornji preglednici.
IEC 60269 sestavljajo naslednji deli pod skupnim naslovom Nizkonapetostne varovalke:
1. del: Splošne zahteve
OPOMBA: Ta del vključuje IEC 60269-1 (tretja izdaja, 1998) in dele IEC 60269-2 (druga izdaja, 1986) in IEC 60269-3
(druga izdaja, 1987).
2. del: Nizkonapetostne varovalke – 2. del: Dodatne zahteve za varovalke, ki jih uporabljajo
strokovne osebe (uporaba varovalk zlasti v industriji) – Primeri tipov standardiziranih varovalk
od A do I
OPOMBA: Ta del vključuje dele IEC 60269-2 (druga izdaja, 1986) in celoten IEC 60269-2-1 (četrta izdaja, 2004).
3. del: Nizkonapetostne varovalke – 3. del: Dodatne zahteve za varovalke, ki jih uporabljajo
nestrokovne osebe (uporaba varovalk zlasti v gospodinjstvu in podobnih okoljih) – Razdelki od
A do F
OPOMBA: Ta del vključuje dele IEC 60269-3 (druga izdaja, 1987) in celoten IEC 60269-3-1 (druga izdaja, 2004).
4. del: Nizkonapetostne varovalke – 4. del: Dodatne zahteve za taljive vložke za zaščito
polprevodniških naprav
OPOMBA: Ta del vključuje IEC 60269-4 (tretja izdaja, 1986) in IEC 60269-4-1 (prva izdaja, 2002).
5. del: Nizkonapetostne varovalke – 5. del: Navodila za uporabo nizkonapetostnih varovalk
OPOMBA: Trenutni IEC/TR 61818 (2003).
Kadar je v to publikacijo vključen del druge publikacije, je za lažjo uporabo to označeno s pripombo v
besedilu.
Tehnični odbor je sklenil, da bo vsebina tega standarda ostala nespremenjena do datuma, določenega
za zaključek periodičnega pregleda, ki je določen na spletni strani IEC "http://webstore.iec.ch" pri
podatkih za to publikacijo. Po tem datumu bo publikacija:
– ponovno potrjena,
– razveljavljena,
– zamenjana z novo izdajo ali
– dopolnjena.
SIST EN 60269-1 : 2007
Uvod
S preureditvijo različnih delov skupine standardov IEC 60269 naj bi se poenostavila njihova uporaba,
še posebej v laboratorijih, ki preskušajo varovalke.
Standardi IEC 60269-1, IEC 60269-2, IEC 60269-3 in IEC 60269-3-1 so bili skladno z obravnavanimi
področji vključeni ali v novi 1. del ali v novi 2. ali 3. del, tako da so deli, ki obravnavajo izključno
"varovalke za pooblaščene osebe", ločeni od delov, ki obravnavajo "varovalke za nepooblaščene
osebe".
Standarda IEC 60269-4 in IEC 60269-4-1 sta bila vključena v novi 4. del, ki obravnava taljive vložke, ki
se uporabljajo za zaščito polprevodnikov.
SIST EN 60269-1 : 2007
Nizkonapetostne varovalke – 1. del: Splošne zahteve (IEC 60269-1:2006)
1 Splošno
1.1 Področje uporabe in predmet standarda
Ta del IEC 60269 se uporablja za varovalke z zaprtimi tokovno-omejilnimi taljivimi vložki z naznačeno
izklopno zmogljivostjo, ne manjšo od 6 kA, ki so namenjene za zaščito izmeničnih vezij z nazivnimi
napetostmi, ne večjimi od 1 000 V, ali enosmernih vezij z nazivnimi napetostmi, ne večjimi od 1 500 V.
Naslednji deli tega standarda, navedeni v tem dokumentu, zajemajo dodatne zahteve za varovalke,
namenjene za posebne pogoje uporabe ali aplikacije.
Taljivi vložki, namenjeni vključitvi v varovalčne-stikalne kombinacije v skladu z IEC 60947-3, morajo
tudi ustrezati naslednjim zahtevam.
OPOMBA 1: O podrobnih lastnostih taljivih vložkov "a" (glej 2.2.4) v enosmernih vezjih naj se dogovorita uporabnik in proizvajalec.
OPOMBA 2: Spremembe in dopolnitve tega standarda, potrebne za nekatere vrste varovalk za posebne namene, na primer
za nekatere varovalke za tirna vozila ali varovalke za visokofrekvenčna vezja, bodo zajete z ločenimi standardi,
če bo to potrebno.
OPOMBA 3: Ta standard se ne uporablja za miniaturne varovalke, ki jih obravnava standard IEC 60127.
Namen tega standarda je določiti lastnosti varovalk ali delov varovalk (podstavka varovalke, nosilca
varovalke, taljivega vložka) tako, da jih je mogoče nadomestiti z drugimi varovalkami ali deli varovalk,
ki imajo zagotovljene enake lastnosti in so glede dimenzij zamenljive. V ta namen se ta standard
nanaša zlasti na:
- naslednje lastnosti varovalk;
- njihove naznačene vrednosti,
- njihovo izolacijo,
- njihov dvig temperature v normalnem obratovanju,
- njihovo izgubno moč in sprejemljivo izgubno moč,
- njihove tokovno-časovne karakteristike,
- njihovo izklopno zmogljivost,
- njihove karakteristike odrezanih tokov in njihove karakteristike I t;
- preskuse tipa za preverjanje lastnosti varovalk;
- označevanje varovalk.
1.2 Zveze s standardi
Za uporabo tega standarda so nujno potrebni spodaj navedeni referenčni dokumenti. Pri datiranih
sklicevanjih se uporablja le navedena izdaja. Pri nedatiranih sklicevanjih se uporablja zadnja izdaja
publikacije (vključno z dopolnili).
IEC 60038:1983 Standardne napetosti IEC
IEC 60050(441):1984 Mednarodni elektrotehniški slovar – Poglavje 441: Stikalne naprave in
varovalke
Dopolnilo 1 (2000)
IEC 60269-2 Nizkonapetostne varovalke – 2. del: Dodatne zahteve za varovalke, ki jih
uporabljajo strokovne osebe (uporaba varovalk zlasti v industriji) – Primeri
tipov standardiziranih varovalk od A do I
SIST EN 60269-1 : 2007
IEC 60269-3 Nizkonapetostne varovalke – 3. del: Dodatne zahteve za varovalke, ki jih
uporabljajo nestrokovne osebe (uporaba varovalk zlasti v gospodinjstvu in
podobnih okoljih) – Primeri tipov standardiziranih varovalk od A do F
IEC 60269-4 Nizkonapetostne varovalke – 4. del: Dodatne zahteve za taljive vložke za
zaščito polprevodniških naprav
IEC 60269-5 Nizkonapetostne varovalke – 5. del: Navodila za uporabo nizkonapetostnih
varovalk
IEC 60364-3:1993 Električne inštalacije zgradb – 3. del: Ocena splošnih karakteristik
IEC 60364-5-52:2001 Električne inštalacije zgradb – 5-52. del: Izbira in namestitev električne
opreme – Inštalacijski sistemi
IEC 60529:1989 Stopnja zaščite, ki jo zagotavlja ohišje (koda IP)
IEC 60584-1:1995 Termočleni – 1. del: Referenčne tablice
IEC 60617 Grafični simboli za sheme
IEC 60664-1:2002 Uskladitev izolacije za opremo v okviru nizkonapetostnih sistemov – 1. del:
Načela, zahteve in preskusi
IEC 60695-2-1/0:1994 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek 1/list
0: Preskusne metode z žarilno žico – Splošno
IEC 60695-2-1/1:1994 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek 1/list
1: Preskus končnega proizvoda z žarilno žico in navodilo
IEC 60695-2-1/2:1994 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek 1/list
2: Preskus vnetljivosti materialov z žarilno žico
IEC 60695-2-1/3:1994 Preskušanje požarne ogroženosti – 2. del: Preskusne metode – Oddelek 1/list
3: Preskus vžigljivosti materialov z žarilno žico
ISO 3:1973 Standardna števila - Standardne vrste števil
ISO 478:1974 Papir – Velikosti neobrezanih pol za formate ISO-A – Osnovni format ISO
ISO 593:1974 Papir – Velikosti neobrezanih pol za formate ISO-A – Dopolnilni format ISO
ISO 4046:1978 Papir, karton, lepenka, vlaknine in izdelki iz teh materialov – Slovar
2 Izrazi in definicije
OPOMBA: Za splošne definicije glede varovalk glej tudi IEC 60050-441.
V tem dokumentu so uporabljeni naslednji izrazi in definicije:
2.1 Varovalke in njihovi sestavni deli
2.1.1
varovalka
naprava, ki s stalitvijo ene ali več posebej načrtovanih in skladnih komponent odpre tokokrog, v
katerega je nameščena. Tokokrog se odpre s prekinitvijo toka, ko ta preseže določeno vrednost v
ustreznem času. Varovalka vključuje vse dele, ki sestavljajo kompletno napravo
[IEV 441-18-01]
2.1.2
držalo varovalke
kombinacija podstavka in nosilca varovalke
OPOMBA: Izraz "držalo varovalke", uporabljen v tem standardu, pomeni podstavke varovalk in/ali nosilca varovalk, če ni
potrebno podrobnejše razlikovanje.
[IEV 441-18-14]
SIST EN 60269-1 : 2007
2.1.2.1
podstavek varovalke
stalen del varovalke, opremljen s kontakti in priključki
[IEV 441-18-02]
OPOMBA: Kjer je to uporabno, pokrovi veljajo za del podstavka varovalke.
2.1.2.2
nosilec varovalke
premičen del varovalke, namenjen za prenašanje taljivega vložka
[IEV 441-18-13]
2.1.3
taljivi vložek
del varovalke, ki vsebuje varovalni(-e) element(-e), namenjen(-e) za zamenjavo po delovanju
varovalke
[IEV 441-18-09]
2.1.4
kontakt varovalke
dva ali več prevodnih delov, zasnovanih za zagotovitev stalnega stika med taljivim vložkom in
ustreznim držalom varovalke
2.1.5
taljivi element
del taljivega vložka, zasnovan, da se pod vplivom čezmernega toka z določeno vrednostjo v
določenem časovnem obdobju stali
[IEV 441-18-08]
OPOMBA: Taljivi vložek lahko vsebuje več vzporednih taljivih elementov.
2.1.6
indikacijska naprava (indikator)
del taljivega vložka, ki kaže, da je varovalka delovala
[IEV 441-18-17]
2.1.7
udarjalo
mehanska naprava, oblikovana kot del taljivega vložka, ki ob delovanju varovalke sprosti energijo,
potrebno za sprožitev delovanja drugega aparata ali indikatorjev ali za zagotovitev sinhroniziranja
ostalih naprav
[IEV 441-18-18]
2.1.8
priključek
prevodni del varovalke, ki zagotavlja električno povezavo z zunanjim tokokrogom
OPOMBA: Priključki so lahko različni, skladno z vrsto tokokroga, za katerega so namenjeni (na primer glavni priključek,
ozemljilo itd.), in tudi glede na njihovo obliko (na primer vijačni priključek, vtični priključek itd.).
2.1.9
nadomestni taljivi vložek
preskusni taljivi vložek z določeno izgubno močjo in dimenzijami
SIST EN 60269-1 : 2007
2.1.10
preskusna priprava
določen preskusni podstavek varovalke
2.1.11
velikostni vložek, kalibrirni kos
dodatni del podstavka varovalke, namenjen zagotavljanju stopnje nezamenljivosti
2.2 Splošni izrazi
2.2.1
zaprt taljivi vložek
taljivi vložek, v katerem je (so) taljivi element(-i) popolnoma zaprt(-i), torej med delovanjem v okviru
svojega učinkovanja ne more proizvesti nikakršnih škodljivih zunanjih učinkov, na primer sproščanja
plina ali izbruha plamena ali kovinskih delcev med razvojem obloka
[IEV 441-18-12]
2.2.2
tokovno omejilni taljivi vložek
taljivi vložek, ki med delovanjem v določenem tokovnem območju omejuje tok na vrednost, ki je
bistveno manjša od temenske vrednosti pričakovanega toka
[IEV 441-18-10]
2.2.3
taljivi vložek "g"
(taljivi vložek za celotno območje izklopne zmogljivosti, v preteklosti taljivi vložek za splošno uporabo)
tokovno omejilni taljivi vložek, pod določenimi pogoji sposoben prekinitve vseh tokov ki povzročijo
taljenje taljivega elementa do njegove naznačene izklopne zmogljivosti
2.2.4
taljivi vložek "a"
(taljivi vložek za omejeno območje izklopne zmogljivosti, v preteklosti taljivi vložek za pomožno uporabo)
tokovno omejilni taljivi vložek, pod določenimi pogoji sposoben prekinitve vseh tokov med najmanjšim
tokom, označenim na njegovi tokovno-časovni karakteristiki (k I na sliki 2), in njegovo naznačeno
2 n
izklopno zmogljivostjo
OPOMBA: Taljivi vložki "a" se na splošno uporabljajo za zagotovitev kratkostične zaščite. Kadar je zahtevana zaščita pred
nadtoki, manjšimi od k I na sliki 2, so uporabljeni v povezavi z drugo ustrezno stikalno enoto, zasnovano za
2 n
prekinitev takšnih majhnih nadtokov.
2.2.5
temperature
2.2.5.1
temperatura zraka okolice
T
a
temperatura zraka okoli varovalke (na razdalji približno 1 m od varovalke ali njenega ohišja, če obstaja)
2.2.5.2
temperatura tekočine v okolici
Te
temperatura tekočine, ki hladi sestavne dele varovalke (kontakt, priključek itd). Je vsota temperature
zraka okolice T in dviga temperature ΔT glede na temperaturo okolice notranje tekočine, ki je v stiku
a e
s sestavnimi deli varovalke (kontaktom, priključkom itd), če je le-ta znotraj okrova. Če varovalka ni v
okrovu, se šteje, da je T enak T
e a
SIST EN 60269-1 : 2007
2.2.5.3
temperatura sestavnih delov varovalke
T
temperatura sestavnega dela varovalke (kontakta, priključka itd.)
2.2.6
nadtokovna selektivnost
usklajenost ustreznih karakteristik dveh ali več nadtokovnih zaščitnih naprav tako, da naprava ob pojavu
nadtoka v določenih mejah predvideno deluje znotraj teh mej, medtem ko druga(-e) naprava(-e) ne
2.2.7
sistem varovalk
družina varovalk, pri katerih so glede oblike taljivih vložkov, vrste kontaktov itd. upoštevana enaka
načela zasnove
2.2.8
velikost
določen niz dimenzij varovalk znotraj sistema varovalk. Vsaka posamezna velikost zajema območje
naznačenih tokov, za katere se določene dimenzije varovalk ne spreminjajo
2.2.9
homogena vrsta taljivih vložkov
niz taljivih vložkov z določeno velikostjo, ki se med seboj razlikujejo samo v takšnih karakteristikah, da
je za določen preskus mogoče vzeti preskušanje enega ali zmanjšanega števila taljivih vložkov v tej
seriji za reprezentativno za vse taljive vložke v homogeni vrsti
OPOMBA: Karakteristike, od katerih taljivi vložki v homogeni vrsti lahko odstopajo, in podrobnosti, ki jih je treba pri taljivih
vložkih preskušati, so podrobneje navedene
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.