XL-21 low-voltage power distribution cabinet is a closed type, the shell is made of steel plate, the knife switch operating handle is installed on the upper part of the front right column, it can be used for switching power supply. A voltmeter is installed in front of the distribution box to indicate the voltage of the bus. There is a door in front of the distribution box. After the door is opened, all the equipment in the distribution box is open for maintenance. This distribution box USES the domestic self - designed components, with compact structure, easy maintenance, circuit scheme can be combined flexibly and so on. In addition to air circuit breaker and fuse for short circuit protection, the distribution box is also equipped with contactor and thermal relay. Operation button and indicator light can be installed at the front door.