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FIELD FAILURE RELAYS 

Field Failure Relays, Field Loss Relay, Field Failure Relay

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  NO EXTERNAL POWER SUPPLY NEEDED

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 FIELD FAILURE RELAY, also known as FIELD LOSS RELAY protects the DC Shunt wound motor or main circuit,  under open field conditions, or in the absence of the field supply

 Speed of the Shunt Wound DC Motor increases as the field supply is weakened Theoretically motor runs at infinite  speed if run without field supply. This break opens the armature coils from the commutator and totally damages  the prime mover.

 The FIELD FAILURE RELAY, when used in series with the field circuit, ensures that no power is supplied to the  armature unless field circuit is complete.

 FIELD FAILURE RELAY is a truly current operated device. As there is no iron core, there is no magnetic storage
 and actuating time is less than 1.2 milliseconds

 This is also used as safety guard in DC clutches, solenoids and brakes.

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