Will AC-rated solid state relay work for DC application?

SS

Hi, Giuseppe. An AC SSR will turn on for a DC load, but it won't turn off. That's because the triac (or inverse parallel SCRs) at the output will only turn off at the zero voltage crossing of the AC line. That won't happen with DC, so you'll be stuck with a one time latch that will only turn off if you remove the power.

Use a DC SSR for DC. Usual cautions about current and voltage ratings apply, of course.

Good luck Chris

SS

Forgot to mention -- a 240VAC-rated SSR will always work for 120VAC. If you look at the data sheets, they will list a minimum as well as maximum load voltage. As I remember, that's usually around 24VAC for the 120VAC SSRs and 48VAC or so for the 240VAC SSRs.

Good luck Chris

Thanks very much for the info, Chris. Just what I needed to know. I really appreciate it!