Relay fuse

Simple battery chargers and power supplies are not normally provided with a current Iimiter. In many cases, however, it would be advantageous if the unit were proof against short-circuits. An electro-mechanlcal fuse which serves that function and which can be added to the unit is shown in the diagram. There are two variations, one for power supplies (a) and the other for battery chargers (b). The circuit will be described on the basis of (a).