First part is the primary winding of a current transformer (C.T.) which is connected in series with the line to be protected.
Second part consists of secondary winding of C.T. and the relay operating coil.
Third part is the tripping circuit which may be either AC or DC. It consists of a source of supply, the trip coil of the circuit breaker and the relay stationary contacts.
Fig. 1.1 Basic Trip Circuit
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