Foreword This amendment has been developed to coordinate selected conformance tests and procedures with ANSI/IEEE C37.20.1-2002 Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear@ and particularly@ to recognize the amendment C37.20.1a-2005. C37.51 is published separately from ANSI/IEEE C37.20.1-2002 and C37.20.1a-2005 to facilitate its use and to permit timely revisions based on experience.
C37.51A-2010由NEMA - National Electrical Manufacturers Association 发布于 2010-01-01,并于 2011-03-05 实施。
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