Question about piface digital 2

acca 11 hours ago

Hello

I have a piface digital 2, i'd like to know the max rated voltage for the relays

It is written 250VAC 10A on the relays body but 20V 5A on the element 14 product page.

Could someone help me please ?

0 michaelkellett 10 hours ago

The relays may be capable of working at 250V but the board probably is not.

You would need to see the underside of the board (if truly good for mains switching you would expect to see slots machined in the pcb under the relays to provide isolation from the signal circuits).

But it has exposed terminals and poor mechanical fixings to the Pi board so I would not consider it safe in any circumstances.

It would be OK with 20V .

MK
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0 dang74 10 hours ago

Not super familiar with this product, but my impression from looking at the photos is that relays reside on the piface board. Could it be a case that the relays themselves handle up to 250VAC but there are other components on the board that restrict its use to a lower voltage. Even the spacing of the traces, if they are too close can restrict the voltage level.
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0 acca 8 hours ago in reply to dang74

Ok, thanks to you both

That's clear !
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0 Robert Peter Oakes 7 hours ago

I have had these for many years and michaelkellett and dang74 are correct, the relays are indeed rated for the higher values but the board both electrically and mechanically (It mounts a bit flimsy to be honest) are not, it would put you and your equipment at greater risk if you used it for mains or anything close to it. Sure you can use it for AC or DC, but stick to no more than 20V (24V psu for control should be perfectly ok)

For better safety look at integrating a SONOFF or SHELLY mains control module and use node red or home assistant on the PI, what are you looking to build?

is this the one you have or the newer one

PiFace Digital II on a PI2, Windows 10 IoT and a cool demo
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