Switches are often used in life, and switches have two types of load switches and circuit breakers, both of which can be connected to the circuit power supply and cut off the circuit power, but the circuit breaker has overcurrent overload protection. The following small series will introduce the difference between the two.
The load switch refers to a control device with a simple arc extinguishing device that can carry the load and the circuit. It can interrupt a certain load current and overload current, but can not open the short-circuit current. It must be used in series with the high-voltage fuse to cut off the short-circuit current by means of a fuse. Specially dealing with current (fault current, rated current), the insulation level of the circuit breaker is very low, so the ability to deal with overvoltage is very weak. Specially designed to deal with voltage (high level of fracture insulation, can deal with high fracture withstand voltage value) switch is an isolating switch, commonly known as knife gate, isolating switch can not deal with any large current, rated current and short circuit current, can cut small current circulation .
The circuit breaker can open and close the circuit under load conditions, and can quickly cut off the short-circuit current when the system generates a short-circuit fault. It also automatically removes short-circuit faults under the action of the protection device. It can deal with current (rated current) and can deal with voltage (breaking insulation level is higher than circuit breaker, but lower than isolation switch), but the load switch can break and close the rated current, close the short-circuit current, but it is forbidden to open the short circuit. Current. Since the load switch cannot break the short-circuit current, it is necessary to install a fuse to provide remote backup protection.
Load switch - without protection (only with rated load for river operation) Circuit breaker - with protection (except for the above, can break the accident current) Isolation switch - for isolation (can not carry load operation)
Fuse - protection element (can break the accident current)
The main difference between circuit breaker and load switch
The circuit breaker can cut off the operating current and accident current.
The load switch can cut off the operating current and cannot cut off the accident current.
The current of the disconnector cannot be cut off. It can only be closed when there is no current.
Traditionally, load switches and circuit breakers are quite different. The load switch is mainly used to break and close the load current. The load switch can be used in combination with the high-voltage fuse to replace the high-priced circuit breaker and cut off the fault current, that is, the short-circuit current. Thus, the load switch is extinguished. The arc function is relatively weak, which reduces the manufacturing cost; also because the conventional load switch is not used to cut off the fault current, there is no need to connect with the protection device and the automatic device, so most of the load switches are manually operated and cannot be operated electrically. The circuit breaker is designed to take into account not only the breaking and closing of the load current, but also the short-circuit current after the fault has been cut off. It must be connected to the protection device and the automatic device, thus having the manual and electric coupling. Brake function. However, from the modern point of view, especially the introduction of foreign technology, the load switch manufacturing is more and more like a circuit breaker, and the individual load switches increase the arc extinguishing capability and increase the electric operation function.
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