Model# 257

3 Phase Monitor

The Model 257 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the Model 257 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 electro-mechanical 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 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.

  • Detects Phase Loss, Low Voltage, Phase Reversal
  • 50Hz, 60Hz, and 400Hz Models
  • Automatic or Manual Reset


Nominal AC Voltage Phase-to-Phase120Vac, 208/240Vac, 480Vac, or 380Vac
Adjustment Range85-120Vac, 160-240Vac, 380-480Vac or 300-400Vac
Frequency50Hz, 60Hz or 400Hz
Repeat Accuracy+0.1% of set point (fixed conditions)
Power Consumption1.4W, 2.4W, 3.7W or 3.0W
Transient Protection2500VAC for 10msec
Operating Temperature20°F to +131°F

Model# 257-3-Phase-Monitor

  • CSA

  • RU


Need Assistance? Call: 614-889-6152

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