Use AC SSR for DC?

[iXod]

Can a solid-state relay specified for an AC load voltage conduct a low (12) DC voltage instead?

The SSR input trigger voltage is specified as 4-32 vdc and load as 24-240 vac.

Thanks.

[ledtester]

Maybe. This page says it depends on what the switching element is:

https://www.allaboutcircuits.com/technical-articles/basics-of-ssr-solid-state-relay-the-switching-device/

Apparently MOS-based SSR's can be used to drive either AC or DC loads.

[Zero999]

Can a solid-state relay specified for an AC load voltage conduct a low (12) DC voltage instead?

The SSR input trigger voltage is specified as 4-32 vdc and load as 24-240 vac.

Thanks.

That's not enough information to go on. As mentioned above, it will only work if it has a MOSFET output stage. My hunch is that it's probably a TRIAC, as it's only speicified to work on AC. This means if it's used with DC, it will act as a one shot device. In other words, once triggered, it will turn on and stay on, until the DC power is interrupted.

[S. Petrukhin]

Turning off TRIAC in a DC circuit is fairly easy. To do this, it is necessary to briefly bypass. It is best to do this with a low-power TRIAC + capacitor circuit. This circuit will briefly take over the flowing current while the capacitor is charged and the TRIAC closes. When the capacitor is charged, the auxiliary TRIAC will also close. An auxiliary TRIAC can be a triac optocoupler.