scope:

Scope and object

This International Standard applies to auxiliary electromechanical contact units associated (or intended to be associated) with circuit-breakers for overcurrent protection, and with residual current operated circuit-breakers with or without integral overcurrent protection for household and similar installations, having a rated voltage not exceeding 440 V a.c. and 250 V d.c., and a rated current not exceeding 10 A.

NOTE 1 These requirements may also be used as guidance for auxiliary contacts units intended to be assembled with other switching devices for household and similar installations.

NOTE 2 It is recommended that the advice of the manufacturer be sought concerning any application with low level energy appliances ( low level values of current and/or voltage.) For low-energy contacts, specific recommendations are given in IEC 60947-5-4.

The object of this standard is to state

a) the characteristics of the auxiliary contact units;

b) their electrical and mechanical requirements with respect to

1) the various duties to be performed;

2) the significance of the rated characteristics and of the markings;

3) the tests to verify the rated characteristics;

c) the functional requirements to be satisfied by the auxiliary contact units with respect to

1) environmental conditions, including those of enclosed equipment;

2) dielectric properties;

3) terminals;

4) safety of use.