The load switch has a simple arc extinguishing device, which can carry a load on and off the circuit, and has a self-extinguishing function. It can switch on and off a certain load current and overload current (working current), but cannot cut off the short-circuit current (accident current). It must be used in series with a high-voltage fuse, and the short-circuit current can be removed with the help of the fuse. High-voltage load switches are generally used to control power transformers.
The circuit breaker can connect and disconnect the circuit under load, and when the system has a short-circuit fault, it can quickly cut off the short-circuit current. In other words, the circuit breaker can cut off the working current and the accident current, and it can also automatically remove the short-circuit fault under the action of the protection device. Circuit breakers are mainly used in motors that frequently break loads, large-capacity transformers, and substations.
1. The circuit breaker can cut off the working current and the accident current, while the load switch can only cut off the working current but not the accident current. This is the main difference.
2. To put it simply, circuit breakers are generally used in places that need to be opened frequently, and load switches are generally used in places that do not need to be opened frequently.
3. Under certain conditions, the load switch can replace the function of the circuit breaker, and the circuit breaker cannot replace the load switch.
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