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Difference between Disconnect Switch and Circuit breaker

2023-02-23

2023-02-23

The difference between the disconnect Switch and the circuit breaker is mainly reflected in: different uses and different equipment structures.

1 .The main purpose of disconnect Switch and circuit breakers is different.
(1) The main purpose of the disconnect Switch is to provide an obvious disconnection point for the circuit. For example, when the isolating switch is disconnected for maintenance, obvious fractures can be seen, so that relevant personnel can quickly and accurately judge whether the primary circuit measures are in place when confirming the safety measures.
(2) The main purpose of the circuit breaker is to break the load current or fault current in the circuit. For example, in the power supply network, if a primary equipment has a short circuit fault, the corresponding circuit breaker will trip according to the command of the protection device to separate the fault equipment from the power grid and ensure the normal operation of the rest of the power grid.
(3) The main function of the disconnect Switch and circuit breaker is not the only one. For example, the disconnect Switch has a constant current breaking capacity and can break some no-load current (please compare the parameters of the Disconnect Switch and the size of the no-load current). The movable circuit breaker can also provide an obvious breaking point for the circuit after the position changes.

2. The equipment structure of disconnect Switch and circuit breaker is different.
(1) The circuit breaker needs to quickly cut off the load current or fault current. There is a fast mechanism to quickly break the circuit breaker contact, and there is an arc extinguishing device to extinguish the arc.

(2) The breaking speed of disconnect Switch contact is much slower than that of circuit breaker, electric operating mechanism or manual operating mechanism; There is no arc-extinguishing device except the load disconnect Switch. (The load disconnect Switch is an disconnect Switch with an arc extinguishing device, which can break the load current, but cannot break the fault current, and its main function is to provide an obvious breaking point)


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