The voltage and power level suggests Power MosFET's as a good schoice - no
need for IGBT's. Of course there are many other considerations. Another
positive is that power loss will be next to nil at low freq's, and since it
sounds like you may be powering a load that's safely inside an enclosure,
using the FET in a low-side-switch config means that gate signal circuitry
will be minimal. There are many, many devices to choose from in the 100V
range, I believe between $1 & 1.50 US.

Chris


> I need to switch 48VDC, 12A to a load.  This won't be fast
> switching, just
> basically supply power to some DC/DC modules.
>
> So choices are relays (that I've always used for such an
> application) or
> maybe a FET of some sort? Or IGBT?
>
> Just looking for some suggestions.
>

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