Regarding the difference between an isolating switch and a load switch and a vacuum circuit breaker, the isolating switch has no special arc extinguishing device, and its arc extinguishing ability is weak. The load switch is a branch with a special arc extinguishing contact, arc extinguishing device and spring breaking device Close switch, vacuum circuit breaker, reliable arc extinguishing device.

The difference between isolating switch and load switch and vacuum circuit breaker

1. Isolating switch

The isolating switch has no special arc extinguishing device, and its arc extinguishing ability is weak, so it is generally used to isolate the voltage and connect or cut off the circuit that has been cut off by the short circuit and the load current does not flow. Current.

The main purpose of the isolation switch is to isolate the power supply voltage when the electrical equipment needs to be repaired, and create an obvious disconnection point to ensure the safety of the maintenance personnel.

2. Load switch

The load switch is a switching switch with a dedicated arc extinguishing contact, an arc extinguishing device and a spring breaking device.

From the structural point of view, the load switch is similar to the isolating switch (there are visible segment points in the alternate state), but it can be used to open and close the circuit, which is similar to the circuit breaker.

However, the circuit breaker can control any circuit, while the load switch can only open and close the load current, or open and close the overload current. Therefore, it is only used to cut off and connect the circuit under normal conditions, and cannot be used as a short-circuit fault current.

However, it is required that its structure can pass the fault current of the short-circuit time without being damaged. Because the arc extinguishing device and contact of the load switch are designed to cut off and switch on the load current.

Therefore, in most cases, the load switch should be used in conjunction with a high-voltage fuse, and the task of dividing the short-circuit fault current by the accessory.

The switching frequency and operating life of load switches often exceed that of circuit breakers.