Temperature Protection Relay: TPR-6


The TPR-6 Temperature Protection Relay is designed to protect electric motors, transformers and other systems from overheating. The TPR-6 has up to 14 temperature inputs that can be programmed to measure thermistors (PTC or NTC) and RTDs (Pt100).

Dependable Performance in a Compact Package

The TPR-6 monitors 1-14 RTD/Thermistor temperature inputs. It accurately measures the temperature increase to protect the motor / transformer from damage due to heat build-up in the windings and / or bearings. The built-in self test protects against disconnected sensors and operator faults.

Performance Features

TPR-6 Application
  • Advanced microprocessor based circuitry
  • Display of operating RTD or Thermistor Data, Fault and Statistics
  • Programmable inputs and outputs
  • RS-485 communication with MODBUS protocol
  • Easy installation and friendly operation
  • Two level protection for Alarm and Trip
  • Selection between Trip and Trip fail-safe
  • Analog output related to any input or input combinations
  • RTD / Thermistor selection - RTDs 100 ohm Platinum (PT100) - Thermistor - PTC or NTC
  • Disconnected sensor protection

Protection Features

  • RTD / Thermistor with two levels for each input
  • Thermistor PTC / NTC selection
  • Over temperature Alarm and Trip to each input
  • Continuous analog output signal
  • External fault 1 and 2

Protection Functions

Exact input can be assigned to any of the following items:

  • Alarm only - Relay A
  • Trip only - Relay B
  • Alarm and Trip
  • Disabled
  • Enabling Auto Reset
  • Programmable Relay C

Typical Applications

  • Low Voltage and Medium Voltage motors (Windings & Bearings)
  • Motors driven by Variable Frequency Drives
  • Transformers
  • Multiple winding and bearing devices (turbines)