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PF-R - Three-Phase Pump Protection Relay, without Level Sensors


Underload protection by COS Φ



The great advantage of PF-R relays is that, by using the motor itself as a sensor, without requiring any external detectors. The relay monitors the cos φ of the motor and stops it before a breakdown occurs due to dry running, cavitation, or a closed valve.


  • Does not require level sensors to detect dry running.
  • For 3-phase motors from 1 to 630 A and over*.
  • Cable feed through relay itself.
  • Precise motor heating and cooling memory, reproduces its thermal image.
  • Visual indication of tripping cause.
  • Adjustable reset time for cos φ.


Suitable for 3-phase submersible pumps, petrol station pumps, and other types of pumps and systems where running without load is critical (dry well, broken transmission belt, etc.).

Protection functions

  • Overload.
  • Underload cos φ.
  • Phase imbalance or phase loss.
  • Phase sequence.

External Display Module (OD-PF)

This optional display module is to be mounted externally, on the panel door or a draw-out unit in a motor control centre (MCC).

  • LEDs indicate cause of the trip cause.
  • Reset push button (Ø22 mm, 7/8”).
  • Easy to install.
  • Connects to the relay by the module’s flat cable (2 m , 6.5 ft).
  • Suitable for motor control centres (MCC) and panel boards.
  • Weight: 0.05 kg / 2 oz.
  • Protection degree: IP50.

* Fanox offers a wide selection of current transformers for higher current levels.

Product Details
10 Items
Data Sheet

English/ Data Sheet PF-R

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PF-R - Three-Phase Pump Protection Relay, without Level Sensors

PF-R - Three-Phase Pump Protection Relay, without Level Sensors

Underload protection by COS Φ

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