| 摘要 |
PURPOSE:To avoid any possibility of fire caused by abnormal current produced by intermeshing, interference or others of wire harness by detecting abnormal current by a current variation detecting sensor provided immediately after a battery and operating state of electrical equipments and then breaking the circuit. CONSTITUTION:A current variation sensor 3 and a breaker 4 are connected to a wire 2 immediately after a battery 1. The wire 2 is branched and connected to respective fuse-links 5 for systems. W/H connected to the fuse-links 5 are connected through fuses 6 to electrical equipments 7. An electrical equipment operation detecting circuit 8 is used to generate an output at the moment when switches of these electrical equipments are closed. When current variation is larger than a predetermined threshold value, a waveform shaping circuit 14 generates a short pulse to operate the breaker 4. |
