Discussion
Primary function of a circuit breaker is :
Answer: A
The primary function of a circuit breaker is to protect the circuit from overloading and faults.
A circuit breaker is a switch that can make and break the circuit under normal conditions and, crucially, interrupt the large currents of an overload or short circuit, isolating the faulty section before the equipment is damaged.
It does not energise the relay; the relay senses the fault and energises the breaker's trip coil. Measuring fault current is done by current transformers and relays, and raising voltage is the job of a transformer.
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