M450 Autotransformer Closed-Transition Reduced Voltage Type

Metron/Metron-Eledyne Fire Pump Controllers conform to the latest requirements of Chapter 7, National Fire Protection Association Pamphlet 20, Standard for Centrifugal Fire Pumps as adopted by Underwriters' Laboratories and Factory Mutual. They are withstand rated and listed by Underwriters' Laboratories and approved by Factory Mutual Research Corporation. Sizes range from 15 to 600 horsepower, 200 to 600 volts, 60 Hz. These controllers are for use on Reduced Voltage type installations. To assure the best possible reliability, only the highest quality components all UL listed or UL recognized are used. The cabinet is fabricated of heavy gauge reinforced steel with drip-proof hood. All field wiring and service connections may be made from the front, allowing the controller to be mounted flush against a wall. The controller is completely wired, assembled, and tested at the factory before shipment, and ready for immediate installation. The M450 Series Autotransformer Fire Pump Controllers incorporate a heavy-duty autotransformer with taps available at 50%, 65%, and 80% to reduce the starting voltage to the motor. The autotransformer is factory wired to the 65% taps unless otherwise specified.The starting inrush current drawn from the power source is reduced to approximately 25% of normal when using the 50% tap, 42% of normal on the 65% tap, and 64% of normal on the 80% tap (other taps are available, consult factory representatives for more information).An adjustable timing relay is provided to control time between reduced voltage start and full voltage operation. An emergency start handle to close starting contactor independent of automatic control is also supplied as standard. When used, this handle will bypass the reduced voltage start feature and start the motor with full inrush current drawn from the power source.