The manufacturer of Small Power Distribution Board can distribute electric energy reasonably to facilitate the opening and closing operation of the circuit. With high safety protection level, it can visually display the conduction state of the circuit. Several causes of Small Power Distribution Board failure are summarized.

(1) Faults caused by the influence of ambient temperature on low voltage apparatus

Low voltage apparatus is composed of fuse, AC contactor, residual current action protector, capacitor, meter, etc. The upper limit of ambient air temperature shall not exceed 40 ℃; The average value of ambient air temperature in 24h shall not exceed 35 ℃; The lower limit of ambient air temperature shall not be lower than -5 ℃ or -25 ℃.

When operating outdoors, it is not only exposed to direct sunlight to generate high temperature, but also generates heat during operation. Therefore, in the high temperature season in midsummer, the temperature in the box will reach more than 60 ℃, which greatly exceeds the specified ambient temperature of these electrical appliances

(2) Faults caused by product quality

Due to the large number of Small Power Distribution Boardes required and the short construction period, the Small Power Distribution Board factory needs a large number of low-voltage electrical appliances. As a result, the requirements for product quality are not strict, causing some products to fail soon after they are put into operation. For example, some types of circuit breakers cannot operate because their coils are burnt out shortly after the Small Power Distribution Board is put into operation.