Hello. Sign In
Standards Store

Look Inside

IEEE C37.90

2005 Edition, September 22, 2005

Complete Document

Relays and Relay Systems Associated with Electric Power Apparatus

Includes all amendments and changes through Reaffirmation Notice , March 31, 2011

View Abstract
Product Details
Document History

Detail Summary

Active, Most Current

Price (USD)
Single User
In Stock
Add to Cart

People Also Bought These:

NEMA 250
ANSI C119.4
IEEE 693

Product Details:

Description / Abstract:

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.


The purpose of this standard is to establish a common reproducible basis for designing and evaluating relays and relay systems.