Is the circuit breaker in the circuit necessary?
when the current is slightly larger, will only cut off the other two phase to produce too much electric current Arched open
When the air is open, it is not recommended to use the fuse, need to protect, open the three-phase at the same time off, such as with the fuse
occasionally short-time overcurrent motor can withstand, but the fuse blown, but also affect the production.
