Time Mark A258B

Phase Monitoring Relay, 480 VAC, SPDT, 10A, 240 VAC, 8-Pin Octal, 258 Series | Time Mark Corporation A258B

Voltage Monitor 480V AC SPDT 10A 240V

PHASE MONITOR, 380-500VAC PH-PH 3-PH

The Model 258 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the Model 258 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). The Model 258 does not require a neutral connection and can be used with Wye or Delta systems. Voltage ranges are sufficiently wide to allow for proper adjustment to existing conditions. Both TRIP and NORM condition indicators are provided to aid in adjustment and system trouble-shooting.