A simple way to see if a fuse has blown without removing it from its holder.Its not often you can design a circuit using just two components, but with just one resistor and an LED this circuit provides visual indication of when a fuse has blown. LED 1 is normally not lit, being "short - circuited" by the fuse, F1. Note that the LED will only light under fault conditions, i.e. a short circuit or shunt on the load. In this case the supply current is reduced to a safe level by R1.
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