A circuit breaker is a switching device that can make, carry, and break currents under normal circuit conditions, and can make, carry, and break currents under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague; generally, those above 3kV are called high-voltage electrical appliances...
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