This recommendation 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 1 200 V d.c.; it also contains additional requirements for integrally-fused ??rcuit-breakers. It applies whatever the rated currents@ the method of construc (e.g. conventionalcircuit-breakers@ moulded-case circuit-breakers) or the proposed appIication of the circkuitbreakers may be.