Protection circuit prevents power distribution box external circuit fault occurs

For the distribution  electri cenergy meter  capacity and above in 100kV · A distribution box, in the box by the side wall thermal windows, you should consider the mounting thermostat relay (JU-3-type or JU-4 subminiature temperature relay) and shaft flow fan, installed in the electrical control panel of the box on the left side  mcb circuit breaker  so that the inside temperature reaches a certain value (eg 40 ℃) can automatically start the exhaust fan, forced cooling exhaust heat to make the housing.
Use of protective  Air circuit breaker  distribution box powered external circuit failure. Choose smaller smart lack of protection, such as the choice of DA88CM-II phase motor protection module (Shanghai product) installed in the distribution box to prevent low-phase electric motor to run and burn.