IS 6875 Pt.1-1973 Specification for control switches (switching gear for control and auxiliary circuits including contractor relays) for voltages up to 1 000 V AC and 1 200 V DC Part I General requirements and tests
1.1 This standard (Part I) applies to mechanical switching devices intended to be installed in control circuits or auxiliary circuits of switchgear and controlgear for the purpose of controlling, signalling, interlocking, etc. These devices are intended to perform solely switching operations and include the micro-gap switches.
Note — The general term ' control switch ' has been used in the subsequent clauses to cover all such devices.
1.2 It applies to control switches, the rated voltage of which does not exceed 1 000 V ac or 1 200 V dc.
1.3 The control switches used for special purpose, such as merchant ships, railways, road vehicles or aircrafts shall also comply with any supplementary requirements.
1.4 The control switches forming an integral part of another mechanical switching device, such as starters or circuit breakers are not covered by this standard. However, if they are self contained and can be used independently, they shall also comply with these requirements.
1.5 This standard does not cover the switching devices intended for isolating purposes.
1.6 Proximity switching devices and contactless switching devices are not covered in this standard.
1.7 The service conditions for which the control switches conforming to this specification are suitable are given in Appendix A.
IS 6875 Pt.1-1973 history
1974IS 6875 Pt.1-1973 Specification for control switches (switching gear for control and auxiliary circuits including contractor relays) for voltages up to 1 000 V AC and 1 200 V DC Part I General requirements and tests