IEEE C37.90-1978 - IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus
Standard Details
This standard applies only to relays and relay systems used to control power switchgear. It does not cover relays of types designed primarily for industrial control, for switching of communication or other low-level signals, or any other equipment not intended for the control of power equipment.
Sponsor Committee
Superseded by
Board Approval
Working Group Details