Thermistor Motor Protection

Thermistor Motor Protection

The thermistor relay will monitor a series circuit of up to 6 thermistors having a healthy resistance, not exceeding 1.5kΩ. Should overheating occur, the individual resistance of a thermistor will rapidly increase above 3.3kΩ, at which point, the normally energised relay will de-energise. In non-latch mode, the relay will re-energise when the circuit resistance drops below 1.8kΩ. In latch mode the unit can be reset when the external normally closed contact is opened, provided that circuit resistance is below 1.8kΩ. In the event of a short circuit on the thermistor circuit terminals or in the event of supply loss, the unit will de-energise.

  • Monitors up to 6 thermistors.
  • Transformer isolation of thermistor circuit.
  • Short circuit protection of thermistor circuit.
  • Latch-on facility selectable.
  • LED indicator for relay energised.
  • LED indicator for supply.
  • Output relay SPCO 10A.

Order Code : TM1

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