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Electronics => Beginners => Topic started by: Precious Roy on December 26, 2016, 12:42:28 pm

Title: Solid state relay question
Post by: Precious Roy on December 26, 2016, 12:42:28 pm

Hello,

You can buy there solid state relay boards http://www.ebay.nl/itm/5V-8-ch-Solid-State-Relay-Genuine-Keyes-Module-240V-AC-2A-Arduino-Flux-Workshop-/121957116913?hash=item1c6535ebf1:g:ZwwAAOSwKfVXEOsB (http://www.ebay.nl/itm/5V-8-ch-Solid-State-Relay-Genuine-Keyes-Module-240V-AC-2A-Arduino-Flux-Workshop-/121957116913?hash=item1c6535ebf1:g:ZwwAAOSwKfVXEOsB)

And i think this is the datasheet for the relays http://www.rhydolabz.com/documents/29/Solid_State_Relay_g3mb_datasheet.pdf (http://www.rhydolabz.com/documents/29/Solid_State_Relay_g3mb_datasheet.pdf)

but i am wondering I need to switch 24v ac and i get the feeling when reading the datasheet that they will not work for 24v ac

can any of you confirm or deny my suspicions?

Title: Re: Solid state relay question
Post by: snarkysparky on December 26, 2016, 01:01:34 pm

It may not work for the low voltage you specify.

The reason is outlined in this document on page 2-14

http://literature.rockwellautomation.com/idc/groups/literature/documents/at/700-at001_-en-e.pdf (http://literature.rockwellautomation.com/idc/groups/literature/documents/at/700-at001_-en-e.pdf)

The output side uses the applied voltage to trigger the internal triacs.  If it's below the design threshold it will trigger late or not at all.