ALLIED ELECTRONICS(CANADA) INC B257B RELAY MONITORING 3PH120V 10A SPDT 257 SERIES

The Model 257 continuously monitors 3- phase power lines for abnormal conditions. When properly adjusted, the Model 257 monitor will detect phase loss on a loaded motor even when regenerated voltage is present. This device consists of a solid-state voltage and phase-angle sensing circuit, driving an electromechanical relay. When correct voltage and phase rotation are applied, the internal relay will energize. A fault condition will de-energize the relay. When the fault is corrected, the monitor will automatically reset (a manual reset version is also available).