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Low-voltage switchgear and control gear - Part 2: Circuit-breakers

Executive summary

Requirements for circuit-breakers for low voltage switchgear and control gear.

Abstract

This European Standard applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V A.C. or 1 500 V D.C.; it also contains additional requirements for integrally fused circuit-breakers.

The object of this standard is to state:

a) the characteristics of circuit-breakers;

b) the conditions with which circuit-breakers need to comply with reference to:

1) operation and behaviour in normal service;

2) operation and behaviour in case of overload and operation and behaviour in case of short-circuit, including co-ordination in service (discrimination and back-up  protection);

3) dielectric properties;

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 apparatus.

This standard applies to circuit-breakers with varying rated currents, method of construction or proposed applications.

The requirements for circuit-breakers which are also intended to provide earth leakage protection, additional requirements for circuit-breakers with electronic over-current protection, additional requirements for circuit-breakers for IT systems, requirements and test methods for electromagnetic compatibility of circuit-breakers, requirements for circuit-breakers not fulfilling the requirements for overcurrent protection, requirements for modular residual current devices (without integral current breaking device), requirements and test methods for electromagnetic compatibility of circuit-breaker auxiliaries are contained in annexes to this standard.

History and related standards

This European Standard supersedes BS EN 60947-2:1996 which is withdrawn.

This standard includes the following cross-references:

IEC 60050(441):1984, IEC 60051 (all parts) , IEC 60068-2-14:1984,

IEC 60068-2-30:1980, IEC 60364 ( all parts), IEC 60364-4-41:1982,

IEC 60695-2-10:2000, IEC 60695-2-11:2000, IEC 60695-2-12:2000,

IEC 60695-2-13:2000, IEC 60755:1983, IEC 60898, IEC 60934, IEC 60947-1:1999, IEC 60947-4-1:2000, IEC 61000-3-2:2000, IEC 61000-3-3:1994,

IEC 61000-4-2:1995, IEC 61000-4-3:2002, IEC 61000-4-4:1995,

IEC 61000-4-5:1995, IEC 61000-4-6:1996, IEC 61000-4-11:1994,

IEC 61000-5-2:1997, IEC 61008-1:1990, IEC 61009-1:1991, CISPR 11:1997 and CISPR 22:1997.

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