Load switch is a switch between circuit breaker and disconnecting switch, with a simple arc extinguishing device, can cut off the rated load current and certain overload current, but can not cut off the short circuit current.
The circuit breaker
Circuit breaker refers to the switching device that can close, load and break the current under normal circuit conditions and can close, load and break the current under abnormal circuit conditions within a specified time.The circuit breaker is divided into high voltage circuit breaker and low voltage circuit breaker according to its use scope.
The difference between a load switch and a circuit breaker
The load switch can turn on and off the normal working current and short-circuit current. Schneider's load switch cabinet SM6 can turn on and off the normal working current for about 200 times and the short-circuit current for about 20 times.But the high voltage circuit breaker generally can open the normal current to reach 10,000 times, and open the short circuit current also has dozens of times (generally 20 ~ 50 times).But high voltage circuit breakers are more expensive.The current load switch can be operated electrically, that is, with tripping and closing coils.So, circuit breakers are used where they need to be broken frequently, and load switches are used where they don't need to be broken often.
1, the load switch can be broken with load, with the function of self-extinguishing arc, but its breaking capacity is very small and limited.
2, the isolation switch is generally not able to break the load, there is no arc extinguisher on the structure of the isolation switch can break the load is different from the structure of the load switch, relatively simple.
3, load switch and isolation switch, can form an obvious break point, most circuit breakers do not have isolation function, there are a few circuit breakers isolation function.
4, the isolation switch does not have the protection function, the load switch protection is generally plus the fuse protection, only the quick break and over current
5, the breaking capacity of the circuit breaker can be made very high in the manufacturing process.Mainly rely on the current transformer secondary equipment to protect.Can have short circuit protection, overload protection, leakage protection and other functions.