The technology has a long history, and the reliability is sufficient; the use cost is low, and a fuse is more than a dime; the use is simple, but the design is complex, the electrical design efficiency is low, the design change cost is high, and the test verification period is long; although the protection is not accurate, it is sufficient. , there is no problem after the design; it needs to be replaced after the fuse, and the “accessibility” design is required to facilitate maintenance; the fuse margin is large, and the wiring harness margin is larger, resulting in high wiring harness costs.