Circuit Breakers are circuit protection switching element. There are medium voltage vacuum and SF6 gas types. In case of malfunction; The relay sends a trip signal to the breaker based on the high current information coming from the current transformer, and the breaker opens the circuit within a period of milliseconds. Circuit Breakers can safely open the feeder under load and in case of malfunction. While usage on high voltage Sf6 insulated ones seen.
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