IEC 62912-2:20 19给出了铁路信号装置中安全相关应用的直流继电器的要求。 本文件适用于弹簧型信号单稳态继电器，其复位力由弹簧的弹性产生。 返回力可以由单独的弹簧和/或由接触弹簧本身提供。

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.