PT 60947-10 - TC 121/SC 121A/PT 60947-10

IEC 60947-10:2026 applies to semiconductor circuit-breakers with a rated voltage up to 1 000 V AC or 1 500 V DC, intended to be installed and operated by instructed or skilled persons.
This document covers the following different types:
- semiconductor circuit-breakers (SCCBs) having semiconductor switching elements and, for isolation function, mechanical isolation contacts connected in series;
- semiconductor hybrid circuit-breakers (SCHCBs) having semiconductor switching elements and mechanical switching elements in parallel and in addition, for isolation function, mechanical isolation contacts connected in series.
In this document, where the term "circuit-breaker" only is used, it applies to both types.
This document applies regardless of the rated currents, the method of construction or the proposed applications of the circuit-breakers.
The object of this document is to state:
a) the characteristics of circuit-breakers;
b) the conditions with which circuit-breakers shall comply with reference to:
1) operation and behaviour in normal service;
2) operation and behaviour under specific abnormal circuit conditions (e.g. overload or short-circuit);
3) dielectric properties;
4) requirements on electromagnetic compatibility;
c) tests intended for confirming that these conditions have been met and the methods to be adopted for these tests;
d) information to be marked on or given with the circuit-breakers.