A circuit breaker is a device that can be controlled both manually and automatically, used to control the system power supply on and off in the equipment circuit system. When suspecting a malfunction in the equipment circuit system, the main functional components of the power supply should be inspected Under normal circumstances, when it is in the on state, the input and output terminals are also in the on state (i.e. powered on); When it is in the disconnected state, the input and output terminals are also in the disconnected state When repairing the circuit breaker in the circuit, it is possible to use its on/off state characteristics and use a multimeter to detect the resistance value between the input terminal and output terminal of the circuit breaker in the event of a power outage to determine whether it is good or bad
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