Time Mark A257B


Relay Voltage Monitor 480V SPDT 10A 3Ph

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  • Factory New
FireAlarm.com Part #: 71966 Category: Manufacturer Part #: A257B


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). The Model 257 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.



Time Mark



Production Status



  • Detects phase loss, low voltage, phase reversal
  • 50Hz, 60Hz and 400Hz models
  • Automatic or manual reset
  • Five-year unconditional warranty


3-Phase Monitor; Model 257
Time Mark – Data Sheet