3RN2 (Thermister Relay)

  • 3RN2 thermistor motor protection relays are suitable for overload protection of explosion proof motors with protection type Ex e. The relays meet the requirements of EN 60079.
  • SIRIUS 3RN2 thermistor motor protection relays are thermal protection devices that are suitable, in combination with type A PTC thermistors, for monitoring temperatures of electrical drives, transformer windings, oils, bearings, air, etc.
  • The most frequent application is monitoring of three-phase motors in which the motor manufacturer has fitted a PTC sensor into every winding overhang and in which these PTC sensors are connected in series.
  • Operating temperature For operation from -25 °C to +60 °C, there are no restrictions for the control supply, switching current, or ON time.
  • Wide voltage range All 3RN2 thermistor motor protection relays are available for supply voltages 24 V AC/DC and 24 to 240 V AC/DC.

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