Electronic fuse

We tend to forget about fuses until one has blown, when it is time to locate and investigate an electrical overload problem. Once that is fixed, a new fuse must be installed. Typically, this will not be handy at the required rating, and the shops are closed. What a drag to serious experimenting! Fortunately, these problems can be overcome with the present circuit. The fuse described here never needs to be replaced, and is as good as new any time the reset switch is pressed.