Service conditions, electrical ratings, thermal ratings, and testing requirements are defined for relays and relay systems used to protect and control power apparatus. This standard establishes a common reproducible basis for designing and evaluating relays and relay systems.

This standard establishes the service conditions, ratings (electrical, thermal, and mechanical), and testing requirements for relays, relay systems, and control devices used for the protection and control of electric power apparatus. For devices with communication ports, where the device does not perform protection or control functions, testing of the communication functions is covered by IEEE Std. 1613. Where the device performs protection or control functions and has communication ports, tests for all communication functions are covered by the IEEE C37.90 family of standards.

This standard establishes a common reproducible basis for validating designs and testing for the service conditions, electrical ratings, thermal ratings, and testing requirements for relays, relay systems, and control devices used for the Protection and Control of Electric Power Apparatus.