Re-usable electrical fuse

A re-usable electrical fuse comprising, in combination, an elongated, non-electrically conductive, normally vertically-extending, transparent hollow capsule of high temperature resistant glass, a first pair of electrical switch contacts extending inwardly of said capsule at one end thereof, a second pair of electrical switch contacts extending inwardly of said capsule at the other end thereof, a charge of fusable metal within said capsule and normally disposed within the upper end portion thereof and in close-circuiting relation with respect to said first pair of electrical switch contacts, a first fuse circuit connector means in series with said first pair of electrical switch contacts, and a second fuse circuit connector means in series with said second pair of electrical switch contacts, whereby, upon a current overload occurring in an electrical load circuit connected in series with said first fuse circuit connector means, said charge of fusable metal will be brought to molten temperature to fall by gravity into the lower end portion of said capsule to solidify in close-circuiting relation with respect to said second pair of electrical switch contacts while at the same time open-circuiting said first pair of electrical switch contacts, as will be readily observable upon visual inspection of said capsule, whereupon said re-usable electrical fuse can be re-used simply by rotating it through 180 degrees end-for-end in a second normal position and connecting the electrical load circuit in series with said second pair of electrical switch contacts.