Time Mark B257B - 3-Phase Monitor, Auto Reset, 120VAC

3-Phase monitor Automatic reset Nominal AC(phase to phase): 120VAC Case color:  Gray Adjustment range: 85-120VAC Frequency: 60Hz Power: 1.4W ABS plastic cover 8-pin socket mounting (sold separately) The Time Mark B257B 3-Phase Monitor continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the unit will detect phase loss on a loaded motor even when regenerated voltage is present. The B257B model offers 120 VAC of nominal AC voltage, gray case color, 85-120VAC adjustment range, 60Hz frequency, and 1.4W power consumption.This device consists of a solid-state voltage and phase-angle sensing circuit, driving an electromechanical relay. When the 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).The Model 257 series does not require a neutral connection and can