Difference between circuit breaker and disconnecting switch

The difference between circuit breaker and isolation switch is: 1, the arc extinguishing device is different; 2, the role is different; 3, switch control is different. If the circuit breaker and disconnecting switch are installed on the same line, the installation sequence should be power side - disconnecting switch - circuit breaker. The closing sequence is: first close the isolation switch, then close the circuit breaker. Switching sequence is: first break the circuit breaker, in the separation leave off.

Difference between circuit breaker and disconnecting switch

Concrete difference

1, the arc extinguishing device is different

The circuit breaker has an arc extinguishing device, which can not only operate the load current, but also operate the fault current;

The isolation switch does not have an arc extinguishing device, although it is specified to operate in the case of load current less than 5A.

Difference between circuit breaker and disconnecting switch

2. Different functions

Circuit breaker plays a very important role, mainly used for the protection of the line, because it is in the impact current protection, short circuit current protection, overload protection, single-phase grounding protection is no switch can replace. General circuit breakers are vacuum circuit breakers, no visible break point. With points, the circuit breaker can be closed, its breaking current is very large, in the 10KV line, the maximum breaking current is 20KA.

The isolation switch acts as an obvious disconnect point and is visible, disconnecting the load side of the power supply. But in the case of live, can not use the isolation switch to close. Because the isolation switch arc extinguishing ability is very low, in the case of power, can not speak the isolation switch down, if the load side current is very large, the isolation switch will burn, and endanger personal safety.

Difference between circuit breaker and disconnecting switch

3, switch control is different

Most of the circuit breakers are operated by remote electric control, and the breaker is referred to as QF. Circuit breaker has a good packaging form, so simply observing the circuit breaker, can not intuitively determine whether it is in the closed or disconnected position.

Most isolation switches are manually operated on the spot. Isolation switch is QS for short. Isolation switch structure is simple, from the appearance can be seen at a glance its running state, there is an obvious disconnect point during maintenance.