①Check whether the load current is in accordance with the rated current of the disconnecting switch.

②Whether the load time constant and load current are compatible with each other.

③ Is there any over-temperature condition in the contact place with busbar or group outlet electrode connecting line?

④whether there is no damage to the magnetic blowing grid and loose conditions

⑤ magnetic blowing grille is not due to poor contact point contact phenomenon resulting in charging and discharging sound

⑥Auxiliary contacts are not burned.

⑦ data signal labeling and power supply circuit is divided and closed is not consistent with the situation

⑧ overpressure off the electromagnetic coil there is no over-temperature conditions and abnormal sound

⑨ magnet on the short-circuit fault ring insulation layer of the crankshaft has not been damaged.

⑩ drive mechanism in the crankshaft position pin and spring yellow is not intact

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

DC circuit breaker-low-voltage electrical basic knowledge of the power distribution equipment to maintain the use of disconnect switches how to use? Should be based on the rated voltage of the power circuit, maintenance regulations and the structural characteristics of the disconnecting switch to select the type of disconnecting switch. For example, for the rated voltage below 600A, the short circuit capacity is not big place, generally use plastic case circuit breaker; If the rated voltage is bigger, should take the all-purpose disconnecting switch; In the leakage protector provisions, should also take the leakage protector type disconnecting switch. In general, the maintenance of transformers and power distribution equipment routes using all-round type disconnect switches, maintenance of motor optional molded case circuit breaker. If the adoption of the importance of selectivity, should take the omnipotent disconnecting switch; and if the importance of small size, the provisions of the low price, should take the molded case circuit breaker.