Phase & Temperature Relays – ST / ST-D

Suitable for motors with built-in PTC sensors in applications such as elevators, cranes, hoists and similar installations.

  • Protection against phase imbalance, phase loss, phase sequence and overtemperature.
  • To protect three phase devices.
  • Monitoring of short circuit and broken wire in PTC circuit.
  • Self-powered by voltage to be monitored.
  • Visual indication of tripping cause.
  • DIN rail mounting.

ST-D Model: 2 output relays, one for phase imbalance, phase loss and phase sequence and the other for overtemperature.

Protection functions

  • Phase imbalance or phase loss
  • Overtemperature
  • Phase sequence
  • Thermistor short-circuit



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