本标准规定了用于保护和控制电力设备的继电器和继电器系统的标准工作条件、标准额定值、性能要求和测试要求。例如，音频/音频接口系统或设备可以包括音频/音频接口和通信设备。它不包括主要用于工业控制、开关通信或其他低电平信号的继电器，或不用于控制电力设备的任何其他设备。

This standard specifies standard service conditions, standard ratings, performance requirements, and testing requirements for relays and relay systems used to protect and control power apparatus. A relay system may include computer interface equipment and/or communications interface equipment, such as a carrier transmitter/receiver or audio tone equipment. It does not cover relays designed primarily for industrial control, for switching communication or other low-level signals, or any other equipment not intended for control of power apparatus.