Electrical and electronic circuits protection device for motor vehicle, has disconnection units that cause breakdown of protection fuse if closed current traversing closed current circuit becomes abnormally high

摘要

The device has an electric energy distribution network (1) that is fed in parallel from a battery (2) by a high current circuit (3) having a power switching relay (4) and by a closed current circuit (5) having a protection fuse (6). Disconnection units (7) cause the breakdown of the fuse if the closed current (Iv) traversing the closed current circuit becomes abnormally high. The disconnection units (7) are switched by control units (8) if the closed current is greater than a current threshold determined for a duration greater than a given duration threshold.