The circuit breaker has an arc extinguishing device, so the circuit breaker can be operated with load, not only can operate the load current, but also operate the fault (short-circuit) current; the circuit breaker has a good packaging form, so simply observing the circuit breaker can not intuitively determine it. In the closed or open position.
The isolating switch does not have an arc extinguishing device. Although the regulations stipulate that it can be operated in situations where the load current is less than 5A, it is generally unable to operate with load; but the isolating switch has a simple structure, and its operating status can be seen at a glance from the appearance. Obviously disconnected.
The circuit breaker is referred to as "switch" in use, and the isolating switch is referred to as "switch" in use, and the two are often used in combination.