| 摘要 |
A dual fuse system is provided to prevent power interruption in advance, by using a subsidiary fuse when a fuse is blown out because of temporary over current state or fuse defect. In a dual fuse system, a first fuse(51) is connected to a current path serially between a power supply(1) and a load(2). A standby fuse circuit is connected to the first fuse in parallel, and is a serial circuit of a diode and a second fuse(53). A first display unit changes a display state if the first fuse is blown out. A second display unit changes a display state if the second fuse is blown out. A power supply state display unit informs whether a power is applied or not.
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