The circuit breaker of a diesel generator set is a switching device that can close, carry, and disconnect current under normal circuit conditions, close the circuit breaker within a specified time, and conduct and disconnect current under abnormal circuit conditions. Circuit breakers can be used for power distribution, infrequently starting diesel motors, protecting power lines and motors. When serious overload, short circuit, undervoltage and other faults occur, the circuit can be automatically cut off. Its function is equivalent to a combination of a fuse switch and an over/under heating relay. And usually there is no need to change the components after disconnecting the fault current. In addition, the circuit breaker of the diesel generator set also needs to have the following functions:

1. The circuit breaker should be able to operate reliably for a long time under rated conditions.

2. It should have sufficient short-circuit capacity. Due to the reliable voltage and high current of the power grid, when the circuit breaker opens, a strong arc is generated between the contacts. Only when the arc is completely extinguished can the circuit be opened. Therefore, it is required that the circuit breaker has sufficient short-circuit capacity, especially in the event of a short-circuit fault, it should be able to reliably cut off the short-circuit current and ensure sufficient thermal and dynamic stability.

3. Have the shortest possible start time. When a short circuit fault occurs in the power grid, it is required that the circuit breaker quickly cuts off the faulty circuit, which can shorten the fault time of the power grid and reduce the harm of short circuit current to short-term equipment.

How can we solve the problem of the circuit breaker not closing when we use diesel generators?

Firstly, you can use a Phillips screwdriver to unscrew the two screws that secure the circuit breaker. Then use a cross screwdriver to remove the red wire behind the circuit breaker, take out the circuit breaker, gently tap it on the table to ensure it is not damaged, and then try to close the circuit breaker! If it can be closed, it's fine. If it can't be closed, keep slapping! After the circuit breaker is tapped normally, install it correctly to ensure stable installation. Then fasten the generator circuit protection board and tighten all the screws on the front panel!

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