搜索一级毛片-搜一级毛片-她也啪在线视频精品网站-台湾午夜剧场-台湾一级毛片免费播放-台湾一级毛片武则天

XL distribution box is divided into power distribution box and lighting distribution box, which is the final stage equipment of the distribution system. XL distribution box is based on the electrical wiring requirements of the switchgear, measuring instruments, protective appliances and auxiliary equipment assembled in a closed or semi-closed metal cabinet or screen, forming a low-voltage distribution device. The circuit can be switched on or off by manual or automatic switch during normal operation. In case of failure or abnormal operation, cut off the circuit or alarm with the help of protective appliances. The measuring instrument can display various parameters in operation, and can also adjust some electrical parameters to prompt or signal deviation from the normal working state. It is commonly used in power generation, distribution and substation. Products meet GB721.12-2013 and other standards.

       The low-voltage electrical apparatus in the distribution box consists of a fuse, an AC contactor, a residual current action protector, a capacitor and a metering meter. The upper limit of ambient air temperature does not exceed 40℃; The               average ambient air temperature of 24h does not exceed 35℃; The lower limit of ambient air temperature is not less than -5 ° C or -25 ° C.