The 18-Pulse Drive in Square D Model 6 motor control center construction includes municipal and industrial pumping applications with adjustable-speed drives and power quality solutions. Key product features include fully rated horizontal main bus, unit disconnect, 18-pulse diode converter bridge, phase shifting autotransformer, ATV61/71 power converter, series line reactor, and precharge resistor and contactor.

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http://www.schneider-electric.us/products-services/products/motor-control-centers/model-6-low-voltage-motor-control-centers/