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:
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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.
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Unfused or fused type circuit breakers.
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Manually operated or power operated circuit breakers with or without electromechanical or solid-state trip devices.
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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).
NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Arlington, Virginia. Its member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Worldwide annual sales of NEMA-scope products exceed $120 billion.
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