Description :

Type PFV Phase Failure Relay, popularly called Single phasing preventer. It operates almost instantaneously and protects the motor under any of the following conditions:

• When there is disconnection of any one of the lines to the motor.
• When the motor connections are reversed in phase.
• When supply voltage is unbalanced

Construction :

The electronic circuit is of the most modern design and high grade components are used to ensure efficient performance.

• It is designed to be used for motors of any HP.
• LED is provided on the relay which will be off in case of Single Phasing or Phase reversal of input terminals of the motor.
• It is normally supplied in a moulded dustproof enclosure.
• Relay can be supplied with time delay and under / over voltage cut-off if required.

Tests :

• When there is disconnection of any one of the lines to the motor.
• When the motor connections are reversed in phase.
• When supply voltage is unbalanced.

Specifications :