(1) Check whether the load current is in line with the rated current of the disconnector

(2) Whether the whole time constant of the load and the amount of load current are matched with each other

(3) Whether there is an over-temperature condition at the contact place with the bus duct or the outgoing electrical connection line of the group

(4) Whether the magnetic blowing grid is damaged and loose

(5) Whether there is a charging and discharging sound in the magnetic blowing grid due to the poor contact of the contact point

(6) Whether the auxiliary contact is burned

(7) Whether the data signal is consistent with the division and integration of the power supply circuit

(8) Whether the overvoltage detached solenoid coil has overtemperature and abnormal sound

(9) Whether the crankshaft of the insulation layer of the short-circuit fault ring on the magnet is damaged

(10) Whether the crankshaft position pin and elastic yellow in the transmission mechanism are intact

(11) The electromagnetic coil reclosing organization is not in all normal conditions

DC circuit breaker - how to use the disconnector for the maintenance of power distribution equipment in the basic knowledge of low-voltage electrical appliances? The type of disconnector should be selected according to the rated voltage of the power supply circuit, the maintenance regulations and the structural characteristics of the disconnector. For example, for the rated voltage below 600A, the short-circuit capacity is not large in the place, generally use the molded case circuit breaker, if the rated voltage is relatively large, the all-round isolation switch should be used, in the leakage protector provisions, should also be used leakage protector disconnector. Under normal circumstances, the maintenance of transformers and power distribution equipment adopts all-round disconnectors, and the maintenance of motors can be optional molded case circuit breakers. If you want to use a selectivity, you should use an all-round disconnector, and if you want to be small and have a low price, you should use a molded case circuit breaker.