Main Breaker A main breaker is a circuit breaker at the input or output of the bus, through which all of the bus power must flow.是什么意思_Main Breaker A main breaker is a circuit breaker at the input or output of the bus, through which all of the bus power must flow.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句