In another question (DC-DC booster fails with lead-acid battery source) I described a problem with a DC-DC booster that destroyed itself by dragging a large current when its output was disconnected.
This did not happend when the power source was a sw-mode (maybe due to its overload circuit), but when a Lead-acid battery was used who could deliver large burst current (>40A).
Apparantly this is a consequence of the DC-booster design. So I need some shut-off circuit which could be a resettable fuse, but I think that this is somewhat a primitive solution.
Maybe its possible to use some power FET, but im not much into how to design control a shut-off state at, say at 8A - and certainly not to make it well working.