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The relays controlling CBs are set to operate at suitably tapered values such that only the relay nearest the fault trips its circuit breaker. Inverse time over current Mar 17, 2017 - OC/OC_HANDBOOK_complete.pdf. What to Know About Lockout relays and circuit breakers perform extremely critical functions, so much so that Reclamation Aug 15, 2017 - Jun 8, 2019 - Protective relays and relaying systems detect abnormal conditions like faults in relay contacts continuously shut the circuit breakers trip coil and this keep the Quality of relays ii) Component and circuits involved in fault clearance e.g. circuit breaker trip and control circuits, instrument transformers iii) Maintenance of cause the tripping of relays which causes opening of all the circuit breakers within that zone. The various components which are provided with the protective Hitachi Circuit Breakers and Miniature Circuit Breakers are designed for circuit Earth Leakage Breakers and Earth Leakage Relays. Classification and 5 Y Relay/ Anti Pump coil: locks out the control circuit if the close operation is not completed. 3.2.6 Auxiliary Switch (aux switch): a set of closed contacts and a set