Time Mark EX257B-380VAC 3PH Power Monitor

⚫ Detects phase loss, low voltage, phase reversal⚫ 50Hz, 60Hz and 400Hz models⚫ Automatic or manual reset⚫ Five year unconditional warrantyMODEL 2573-Phase MonitorShown with optional 8-pin socket The Model 257 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, theModel 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 alsoavailable).The Model 257 does not require a neutral connection and can be used with Wye or Delta systems. Voltage rangesare sufficiently wide to allow for proper adjustment to existing conditions. Both “TRIP” and “NORM” conditionindicators are provided