> From:         Alan Gorham[SMTP:alan@MICROTIMA.CO.UK]
> Sent:         Monday, September 29, 2003 6:08 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE:] Options for switching ac and dc?

> I am aware of SSR products, but I have yet to find a single devce that would be
> capable of switching ac or dc.
> For example, the vast majority of SSR devices I have found use a triac output
>  with zero crossing detector and snubber network) and thus are not the best
> choice for dc switching I would have thought?

> Alan

True. I had forgotten that most SSRs are for AC switching. There are some, though,
that handle DC. A quick look through the Newark catalog shows that Crydom makes
2 versions with DC output: one with MOSFET output (up to 500  VDC output max),
and one with bipolar transistor output (60 VDC output max). Either of these placed
inside a bridge could also switch AC. See page 596 of catalog 120.

John Power

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