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IEC 62912-2 Ed. 1.0 en:2019 Railway applications - Direct current signalling monostable relays - Part 2: Spring type relays
standard by International Electrotechnical Commission, 08/16/2019
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IEC 62912-2:2019 gives requirements for direct current relays intended for safety-related applications in railway signalling installations.This document is applicable to non-proved signalling monostable relays of the spring type, whose return force is generated by elasticity of spring.
The return force can be provided either from a separate spring and/or from the contact springs themselves.