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.

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