What are the reasons for the burnout of the combiner box?

‌The main reasons for the burnout of the combiner box include the following aspects‌:

Insecure wiring‌: The wiring between the photovoltaic string and the combiner box is not secure, and the contact is poor during operation, causing arcing. The fuse base melts under high temperature and causes a short circuit‌.

‌Wiring error‌: When the photovoltaic string is connected to the combiner box, the construction personnel did not correctly distinguish the positive and negative poles, and connected the positive pole of a string with the negative pole of other strings, causing a short circuit.

‌Power module failure‌: An internal fault occurred in the power module, causing arcing‌.

Circuit breaker problem‌: The phase interval of the circuit breaker is not installed, or the circuit breaker is too close to the casing, and the arcing distance is not enough‌.

‌Loose waterproof terminal‌: The waterproof terminal at the bottom of the combiner box is loose, causing the cable to loosen, resulting in arcing and burning the terminal‌.