For the fuse standard system, the main IEC standards, UL standards and ISO standards, Chinese GB, German DIN and British BS are basically equivalent to IEC standards. IEC standards mainly include IEC 60127, IEC 60269, etc., UL mainly includes UL248, etc., ISO mainly includes ISO 8820 series, etc. For China's national standard GB, there are currently 37 national standards for fuses, which are currently being implemented or will be implemented soon, and there are corresponding industry standards corresponding to different voltage levels or industries.
The standards for road vehicles mainly refer to the GB31465 series of ISO 8820. In the actual development process of the vehicle, as for the selection of the fuse, in addition to the voltage and current, environmental factors such as temperature, ventilation and height, etc., as well as interference between electrical systems, etc., should also be considered. The following formula is a well-known fuse The manufacturer's selection method, which basically covers the relevant revisions, in fact, when the relevant fuses are selected, the main suppliers will implement the corresponding suggestions in order to better play their product characteristics.
A simple electrical system includes fuses, connecting wires and electrical appliances. The basic function of the fuse is to protect the wires from overheating. The fuse should be blown before causing thermal damage to the wires. Wires also need to be selected and checked accordingly. GBT 31465.2 gives the flow chart of type selection and checking. The selection of fuses is related to the rated current of the system, the maximum current impact, environmental factors, and connecting wires. And various companies have provided some general selection principles, but in the actual development process, the influence of the system circuit must also be considered. Electric vehicles are equipped with many power electronic devices, and some abnormal phenomena may occur in the interaction between them.
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