(1) Check whether the load current matches the rated current of the disconnector.
(2) Verify if the load time constant and load current magnitude are properly matched.
(3) Inspect for overheating at contact points with bus ducts or outgoing electrical connections.
(4) Check for damage or looseness in the arc chute grid.
(5) Detect abnormal arcing sounds in the arc chute due to poor contact.
(6) Examine auxiliary contacts for signs of burning.
(7) Confirm signal consistency with power circuit division/integration states.
(8) Inspect overvoltage release coils for overheating or abnormal noises.
(9) Check insulation shafts and short-circuit rings on magnets for damage.
(10) Verify integrity of transmission mechanism's shaft pins and springs.
(11) Ensure electromagnetic coil reclosing mechanisms are functioning normally.
DC Circuit Breaker Application Guidelines
Select disconnector types based on:
● Circuit rated voltage
● Protection requirements
● Structural characteristics
For ≤600A circuits with low short-circuit capacity: Molded case circuit breakers
Higher current applications: All-round disconnectors
Leakage protection scenarios: Use leakage protector disconnectors
Transformer/power distribution protection: All-round disconnectors
Motor protection: Molded case circuit breakers (optional)