IEC 62912:2015 gives requirements for direct current relays intended for safety-related applications in railway signalling installations. This International Standard is applicable to monostable relays of type N and type C.
IEC 62912 Ed. 1.0 b:2015
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Railway applications – Direct current signalling monostable relays of type N and type C
International Electrotechnical Commission , 07/24/2015
Pages: 29
