Selection criteria for vacuum circuit breakers

Vacuum circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overload or short-circuit and under-voltage faults, they can automatically cut off the circuit. Its function is equivalent to a fuse type. Combination of switch and overheating relay, etc. Moreover, it is generally not necessary to change the components after breaking the fault current. At present, it has been widely used. The following is an introduction to the selection guide of vacuum circuit breakers.
General principles for the selection of vacuum circuit breakers:

In order to ensure the safety of high-voltage electrical appliances in normal operation, maintenance, short-circuit and overvoltage conditions, high-voltage electrical appliances should be selected according to the following conditions:

① Select according to normal working conditions, including voltage, current, frequency, mechanical load, etc.;

② According to short-circuit conditions, including short-time withstand current, peak withstand current, making and breaking current, etc.;

③ Select according to environmental conditions, including temperature, humidity, altitude, earthquake, etc.;

④ Select according to the ability to withstand overvoltage including insulation level;

⑤ According to the different characteristics of various high-voltage electrical appliances, including the operation performance of the switch, the coordination of the protection characteristics of the fuse, the load of the transformer and the accuracy level, etc.