Motor management relay features and benefits

July 31st, 2012, Published in Articles: Energize

The SEL-849 motor management relay supports pumping applications for water, chemicals, and petroleum; air-based applications, including fans, blowers, air handlers, and compressors; chiller applications, such as compressors and air-conditioning; and applications involving bulk materials, such as conveyors, crushers, screeners, feeders, augers, and bucket elevators. The compact form-factor 71,1 X 127,0 X 152,4 mm easily installs in small motor control center (MCC) drawers and buckets. Built-in current transformers save room and reduce installation time.The web interface makes it easy for electricians and technicians to configure and monitor the relay. Several communications protocol options allow the relay. to be used with old and new control systems. MCCs typically have large fault-current potential, resulting in increased arc-flash hazards. The relay’s arc-flash detection capability significantly reduces total arc-flash energy. All SEL relays are designed to operate in harsh environments where other relays may fail. The relay. operates in extreme conditions, with an operating temperature of -40° to +85°C, and is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions. The relay. also provides many of the same functions as a programmable logic controller (PLC). Multiple communications options, a variety of I/Os, and programmable Selogic control equations make the relay. a complete automation and protection solution.

Contact Rudolf van Heerden, SEL, Tel 012 664-5930,

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