OVERCURRENT PROTECTION DEVICE

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Provided is an overcurrent protection device which cuts off a load circuit so as to protect the load circuit when a rare shortcircuit or a dead shortcircuit has occurred. The overcurrent protection device includes : first overcurrent detection means which detects a back electromotive force generated in a power supply cable; and second overcurrent detection means which detects that a load current ID arranged in each of load circuits has become an overcurrent. Furthermore, the overcurrent protection device includes delay means which outputs a delay signal with a first delay time when an overcurrent is detected by the first overcurrent detection means and outputs a delay signal with a second delay time which is shorter than the first delay time when an overcurrent is detected by the second overcurrent detection means. With this configuration, it is possible to cut off the load circuit with the first delay time upon occurrence of a rare shortcircuit and with the second delay time upon occurrence of a dead shortcircuit.