International Electrotechnical Commission

Circuit-breakers for equipment (CBE) - Edition 3.2 Consolidated Reprint
 N 60934

Annotation

This International Standard is applicable to mechanical switching devices designed as "circuitbreakers for equipment" (CBE) for household and similar applications. CBEs according to this standard are intended to provide protection to circuits within electrical equipment including its components (e.g. motors, transformers, internal wiring). This standard covers also CBEs applicable for protection of electrical equipment in case of undervoltage and/or overvoltage. This standard also covers CBEs which are suitable for isolation.

NOTE The term "equipment" includes appliances.

CBEs are not applicable for overcurrent protection of wiring installations of buildings.

CBEs according to this standard have:

– a rated voltage not exceeding 440 V a.c. (between phases) and/or d.c. not exceeding 250 V;

– a rated current not exceeding 125 A;

– a short-circuit capacity (Icn) of at least 6xIn (a.c types) and 4xIn (d.c.-types) but not exceeding 3 000 A.

CBEs may have a conditional short-circuit current rating in association with a specified shortcircuit protective device (SCPD). A guide for coordination of a CBE associated in the same circuit with a SCPD is given in Annex F.

For CBEs having a degree of protection higher than IP20 according to IEC 60529, for use in locations where hazardous environmental conditions prevail (e.g. excessive humidity, heat or cold or deposition of dust) and in hazardous locations (e.g. where explosions are liable to occur), special constructions may be required.