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

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.

Features

• 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.

Applications

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.

https://www.fanox.com/products/pumps-protection-and-control/pump-protection-relays/pf-r/

Choose from the table below the PF-R model that fits your motor-pump. Fanox offers a wide selection of current transformers for higher current levels.