Littelfuse 250A Three-Phase Voltage MonitorLittelfuse 250A Voltage Monitor Product Description Model 250A is an auto ranging voltage monitor designed to protect 3 phase motors regardless of size. It is used on 190 480VAC, 50 to 60 Hz motors to protect the motors from damage caused by single phasing, low voltage, phase reversal, voltage unbalance, and also high voltage. Added features include the DPDT contacts that are used to perform two functions when parameters are exceeded in addition to
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