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Underwriters Laboratories 845 standard for low voltage motor control centers requires a short circuit withstand rating on the bus for only 3 cycles. However, in power distribution systems today low voltage motor control centers are increasingly fed from low voltage low voltage power circuit breakers located in low voltage switchgear ahead of or in a motor control center line up; these low voltage...
This paper will discuss the importance of reliable and repeatable performance of molded case circuit breakers in today's power distribution systems. The paper will review existing standards for maintenance of molded case breakers including procedures outlined in NEMA AB4 and IEEE1458. Common misconceptions and system application issues regarding these devices will be discussed. Several examples of...
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