Test Procedures cover enclosed low-voltage AC circuit breakers.June 20, 2012 -
NEMA published ANSI/NEMA C37.50 Low-Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures, the first new edition in 24 years. Document covers stationary or drawout circuit breakers of 2-, 3-, or 4-pole construction, with 1 or more rated max voltages of 635, 508, and 254 V for application on systems having nominal voltages of 600, 480, and 240 V. It applies to unfused or fused type breakers as well as manually operated or power operated units.
NEMA Publishes ANSI/NEMA C37.50 Low-Voltage AC Power Circuit Breakers Used in Enclosures-Test Procedures |
National Electrical Manufacturers Association (NEMA)
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Press release date: June 5, 2012
ROSSLYN, Va., -The National Electrical Manufacturers Association (NEMA) published ANSI/NEMA C37.50 Low-Voltage AC Power Circuit Breakers Used in Enclosures-Test Procedures.
The first new edition in twenty four years, ANSI/NEMA C37.50 covers the test procedures for enclosed low-voltage ac power circuit breakers as follows:
a) Stationary or drawout circuit breakers of two-, three-, or four-pole construction, with one or more rated maximum voltages of 635 V (600 for units incorporating fuses), 508 V, and 254 V for application on systems having nominal voltages of 600, 480, and 240 V.
b) Unfused or fused type circuit breakers.
c) Manually operated or power operated circuit breakers with or without electromechanical or solid-state trip devices.
d) Fused drawouts consisting of current-limiting fuses in a drawout assembly intended to be connected in series with a low-voltage ac power circuit breaker to form a non-integrally fused circuit breaker.
This document applies to both integrally and non-integrally fused circuit breakers.
ANSI/NEMA C37.50-2012 may be downloaded at no cost at www.nema.org/stds/c37-50.cfm. A hard copy may be purchased for $62 by visiting global.ihs.com, or contacting IHS by phone at 800-854-7179 (U.S. only) or 303-397-7956 (international).
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