On 2008-07-06, flipper wrote:

Having the fuse on the input to the variac provides progressively less and
less protection as the voltage setting is reduced - finally providing none
at all.

Well, even an output fuse isn't 'perfect' because max current at mid
scale is less than at 1-1 so if you 'protect' mid scale you limit the

assuming the device is wound all the way with the same gauge of wire
max current output near mid scale is more than anywhere else (except at
exactly 100%, or 0% where the only limit is the current handling capacity of
the wiper!)

--

Bye.
Jasen