(1) Check if the tripping force is too small, adjust the spring and increase the pulling force.
(2) Check if the energy storage spring force is reduced.
(3) Check if the mechanism is stuck, such as rust, deformation, etc.
After closing the circuit breaker, it is disconnected after a period of time
(1) Check if the long delay setting value of the overcurrent release is too small. If so, adjust it.
(2) Check if the parts of the electronic overcurrent release are damaged.