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Fuse Monitor / Alarm

source: RED Free Circuit Designs

 

It came to me in a flash. 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. Should the inevitable "big-bang" happen in your workshop then LED1 will illuminate and led you know all about it!  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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