Why can't the plastic case circuit breaker be closed or broken

If you want to know why the plastic case circuit breaker cannot be opened, you first need to understand the following:
1. Whether the plastic case circuit breaker has a long service life: If the service life is not very long, the rust and aging faults of the internal metal mechanical parts of the circuit breaker can be eliminated, which can be considered from the working mode and wiring of the circuit breaker. For example, the interface of the circuit breaker connection is loose, causing the internal detection unit to fail to detect circuit faults, or the short-circuit rated current is too large, and it cannot be disconnected in time to ensure the safety of the circuit when a conventional small current fault such as a short-circuit occurs.
If the service life is long, you have to consider the aging of internal parts, or the electrical life or mechanical life of the circuit breaker has been reached, and the internal has been seriously damaged.

2. In the high-current installation environment, for safety reasons, the torsion of the handle will be increased to avoid accidental closing or power failure of the molded case circuit breaker. At this time, a special handle is required for operation, just buy a handle.
3. The reason why the molded case circuit breaker cannot be opened or closed may also be the internal mechanical parts or other components. At this time, you must not disassemble the circuit breaker by yourself, and report to the merchant who purchased it for replacement in time. If it exceeds the merchant The warranty period can be repaired in consultation with the merchant, or repurchased to replace it.

4. Different plastic case circuit breakers have different protection mechanisms. If the circuit breaker trips normally due to a line fault, it is a normal phenomenon that the electrician can troubleshoot the fault.
If you are not a professional electrician, you can't solve this problem yourself, you need professional personnel to operate it.