Applies to control circuit devices and switching elements intended for controlling, signalling and interlocking of switchgear and controlgear having a rated voltage not exceeding 1000 volt a.c. (at a frequency not exceeding 1000 Hz) or 600 V d.c. Provides special requirements for indicator lights and control switches with positive opening operation. This Standard is technically equivalent to and reproduced from IEC 947-5-1:1990, including the Corrigendum:1991 and Amendment 1:1994.