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North Dakota | I am assuming that you are using a 20 volt DC input to the relay to close the contacts to a 3.3 Volt GPIO pin? If that is what you are looking for almost any 20-24 volt relay will work, the contacts will be able to take 3.3V from pins 1 or 17 to a GPIO pin.
I did a quick search on DigiKey and found a number of relays that might work. From PCB mounts to DIN rail mounts, it depends on how you wish to mount it and how much current it needs to carry.
A little more info on what you are trying to do might help. Are you switching a tenth of an amp or ten amps? | |
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Relay for raspberry pi project
