EN 3773-004:2014
(Main)Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 004: UNC thread terminals - Product standard
Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 004: UNC thread terminals - Product standard
This European Standard specifies the characteristics of single-pole circuit breakers, temperature compensated with a rated current from 1 A to 25 A, used in aircraft on-board circuits at a temperature between – 55 °C and 125 °C and at an altitude of 22 000 m max.
These circuit breakers are operated by a push-pull type single push button (actuator), with delayed action "trip-free" tripping.
They will continue to function up to the short-circuit current.
Luft- und Raumfahrt - Schutzschalter, einpolig, temperaturkompensiert, Nennströme von 1 A bis 25 A - Teil 004: UNC-Klemmengewinde - Produktnorm
Série aérospatiale - Disjoncteurs unipolaires compensés en température, intensités nominales 1 A à 25 A - Partie 004 : Bornes à filetage UNC - Norme de produit
Aeronavtika - Odklopniki, enopolni, temperaturno kompenzirani, naznačeni tok od 1 A do 25 A - 004. del: UNC-navojni priključki - Standard za proizvod
Ta evropski standard določa značilnosti enopolnih temperaturno kompenziranih odklopnikov z naznačenim tokom od 1 A do 25 A, ki se uporabljajo v letalskih vezjih pri temperaturi med –55 °C in 125 °C ter na največji višini 22000 m.
Ti odklopniki se upravljajo z enim gumbom (sprožilom) vrste potisni-povleci, z zakasnjenim proženjem brez sprožila.
Delovali bodo do kratkega stika.
General Information
- Status
- Published
- Publication Date
- 14-Oct-2014
- Withdrawal Date
- 29-Apr-2015
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 2 - Electrical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2025
- Completion Date
- 21-Jan-2026
Relations
- Effective Date
- 17-Jul-2013
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
The EN 3773-004:2014 standard defines the product specifications for aerospace single-pole circuit breakers with temperature compensation, featuring rated currents from 1 A to 25 A. These circuit breakers are designed explicitly for aircraft on-board electrical circuits, operating reliably within a broad temperature range of –55 °C to 125 °C and at altitudes up to 22,000 meters. They employ a push-pull single push-button actuator with a delayed action "trip-free" tripping mechanism, ensuring safe and continuous operation even under short-circuit conditions. Established by CEN and ASD-STAN, this standard supersedes the earlier EN 3773-004:1999 and aligns European aerospace electric circuit protection components under unified technical requirements.
Key Topics
- Scope and Application: Applies to temperature-compensated circuit breakers designed to maintain operational integrity across extreme environmental conditions typical in aerospace environments.
- Mechanical Design: Includes detailed dimensional requirements, with terminals featuring UNC 8-32 thread for secure and standardized connectivity. Recommended tightening torque values ensure proper installation: ~4.00 ± 0.25 N·m for attachment nuts and ~1.6 ± 0.1 N·m for connection hardware.
- Electrical Characteristics: Rated for various voltages including 28 V DC and 115 V AC at 400 Hz, compatible with modern aircraft electrical systems. Features voltage drop limits, overload tripping thresholds, and short-circuit current endurance as per stringent aerospace safety criteria.
- Environmental Resistance: Validated for resistance to vibrations (up to 10 gn sinusoidal), shocks (50 gn), humidity, corrosion, contaminating liquids, and lightning-induced overvoltage, ensuring robustness in harsh flight conditions.
- Durability: Offers specified mechanical and electrical endurance with thousands of switching cycles under load and no-load conditions documented to maintain long-term reliability.
- Marking & Identification: Requires detailed product marking including manufacturer details, date codes, rated current labels, and terminal identification to support traceability and maintenance.
Applications
EN 3773-004:2014 single-pole circuit breakers are critical components in aerospace electrical protection systems. Their practical applications include:
- On-board aircraft electrical and avionics circuits operating at high altitudes and extreme temperature variations.
- Aircraft power distribution panels requiring reliable overcurrent protection with rapid fault clearance.
- Systems demanding trip-free, push-pull actuated breakers providing pilot and maintenance personnel intuitive control and assured safety.
- Usage in military, commercial, and general aviation sectors where compliance with standardized aerospace electric equipment elevates safety and interoperability.
- Environments exposed to mechanical stresses such as vibrations and shocks during flight without compromising circuit integrity.
Related Standards
The EN 3773-004:2014 standard complements and references several key aerospace and electrical standards, including:
- EN 2350: Aerospace series technical specifications for circuit breakers.
- EN 2282: Electric power supply characteristics for aircraft applications.
- EN 3773-001: Technical specifications for single-pole circuit breakers without terminal thread details.
- EN 6113: Specifications for circuit breaker connection and attachment hardware.
- TR 6083: Panel cut-out requirements for installation of electrical components in aerospace systems.
- FED-STD-595B: Standardized color codes for government procurement, applied to breaker button and marking colors for consistency.
This integration ensures full compliance with aerospace safety protocols, simplifies maintenance, and guarantees compatibility across a wide range of aircraft electrical system components.
By adhering to EN 3773-004:2014, aerospace manufacturers and maintenance providers ensure the usage of reliable, standardized single-pole circuit breakers with UNC thread terminals, capable of enduring extreme airborne operational environments while maintaining safety and performance standards.
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Frequently Asked Questions
EN 3773-004:2014 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 004: UNC thread terminals - Product standard". This standard covers: This European Standard specifies the characteristics of single-pole circuit breakers, temperature compensated with a rated current from 1 A to 25 A, used in aircraft on-board circuits at a temperature between – 55 °C and 125 °C and at an altitude of 22 000 m max. These circuit breakers are operated by a push-pull type single push button (actuator), with delayed action "trip-free" tripping. They will continue to function up to the short-circuit current.
This European Standard specifies the characteristics of single-pole circuit breakers, temperature compensated with a rated current from 1 A to 25 A, used in aircraft on-board circuits at a temperature between – 55 °C and 125 °C and at an altitude of 22 000 m max. These circuit breakers are operated by a push-pull type single push button (actuator), with delayed action "trip-free" tripping. They will continue to function up to the short-circuit current.
EN 3773-004:2014 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3773-004:2014 has the following relationships with other standards: It is inter standard links to EN 3773-004:1999, EN 3773-001:2024, EN ISO 20765-2:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3773-004:2014 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.]YRGLuft- und Raumfahrt - Schutzschalter, einpolig, temperaturkompensiert, Nennströme von 1 A bis 25 A - Teil 004: UNC-Klemmengewinde - ProduktnormSérie aérospatiale - Disjoncteurs unipolaires compensés en température, intensités nominales 1 A à 25 A - Partie 004 : Bornes à filetage UNC - Norme de produitAerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 004: UNC thread terminals - Product standard49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3773-004:2014SIST EN 3773-004:2015en,fr,de01-januar-2015SIST EN 3773-004:2015SLOVENSKI
STANDARDSIST EN 3773-004:20021DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3773-004
October 2014 ICS 49.060 Supersedes EN 3773-004:1999English Version
Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 004: UNC thread terminals - Product standard
Série aérospatiale - Disjoncteurs unipolaires compensés en température, intensités nominales 1 A à 25 A - Partie 004 : Bornes à filetage UNC - Norme de produit
Luft- und Raumfahrt - Schutzschalter, einpolig, temperaturkompensiert, Nennströme von 1 A bis 25 A - Teil 004: UNC-Klemmengewinde - Produktnorm This European Standard was approved by CEN on 12 October 2013.
CEN 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 CEN-CENELEC Management Centre or to any CEN 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 CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3773-004:2014 ESIST EN 3773-004:2015
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