scope:

This Recommendation applies to mechanical switching devices intended to be installed in control circuits of switchgear and controlgear for the purpose of controlling, signalling, interlocking, etc. These devices are intended to perform solely switching operations and include micro-gap switches. This Recommendation applies only to devices, the rated insulation voltage of which does not exceed 1000 V a.c. (at a frequency not exceeding 1000 Hz) or 1200 V d.c. Mechanical switching devices serving the purpose of control switches, but forming an integral part of another mechanical switching device, such as certain control contacts or contactors or of circuit-breakers, are not covered by this Recommendation. However, if they are self-contained and can be used independently, they shall satisfy this Recommendation.