• -₹100.00
Model  : PFR-ASP

Model : PFR-ASP

₹500.00 Save ₹100.00
Tax included


Voltage Sensing type
ABS Body
Auto Start Unit
Single Phase Protection
Preventor ON Indication
Auto Start ON Indication
Dry Relay Contacts for both Auto Start and Preventor
Compact design
Compatible with all 3 Phase Starters
Suitable for DOL and Star Delta Starters
Supply sequence reverse blink indication


1HP to 20HP

This is an Auto Start Unit with voltage sensing type Single Phase Preventor. This product turns OFF the 3 Phase Motor during the loss of supply phase and also turns ON the 3 Phase Motor on the arrival of power supply. This product provides the protection to the motor against single phasing. The relay contacts C1 and C2 (Normally Open) will close as soon as the supply voltage in the proper sequence is detected in all the 3 lines. The Preventor ON LED turns ON when the 3 Phase sequence is OK. The preventor ON led turns OFF and C1 and C2 open in case of a loss in phase. The Auto Start ON Led turns ON only for the 5 seconds when the motor ON is attempted. The Switch provided on the device can be used to Turn ON/OFF the Auto Start Unit.


Weight:300 Grams

Length: 10 cms

Breadth: 15 cms

Height: 9 cms


Red , Yellow and Blue 3 core wires to incoming 3 Phase Supply

Red and Yellow (C1 and C2) 2 core wires in series with the STOP/OFF push button of the motor starter

Red and Black (K1 and K2) 2 core wires in parallel with the START/ON push button of the motor starter

Technical Specifications:

3 Phase 440V Incoming Power Supply
Relay Contacts C1 and C2, K1 and K2 are Normally Open Dry Contacts
Operating Voltage Range: 220 to 450V AC
Tripping time: Less than 2 seconds
Auto Start Relay Pulse Time: 5 seconds
Minimum wire size for the relay contacts - 0.5 sq mm


Naren Auto Start Unit with Single Phase Preventor Model PFR-ASP is used in the majority of 3 Phase motor starters both as Auto Start and as a mandatory protection mechanism against single phasing. This product protects the motor quickly responds to single phasing by turning OFF the motor starter instantaneously when the single phasing is detected. It also turns ON the motor as soon as the 3 Phase supply is back by checking the incoming power supply. It thus makes sure the motor runs for as long as the 3 Phase supply is present and at the same time providing protection against Single Phasing.


This product carries a warranty of 6 months from the date of purchase. Any issues within the warranty period will be attended to free of cost at our works in Bangalore. Post the warranty period, the product will be eligible for the paid service at our works. The invoice copy acts as a warranty card. The shipping of the product for repair will have to be done by the consumer.

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