This product is installed at the bottom of the vehicle by hanging. Its main function is to move the components and functions of the car's electrical cabinet down to the lower end of the car, which can reserve more seating space for the car. At the same time, it also places higher demands on the integration level and under car protection performance of the product. Electrical components such as circuit breakers, transfer switches, control relays, smoke alarms, connectors, indicator lights, etc. are installed inside the box to achieve logical control, auxiliary distribution, and circuit protection functions related to various electrical systems such as traction, network, and braking.