BraveSirRobbin
Moderator
Well, I'm guessing that isn't really the way you are wiring it up (you have the NO and C going to the Elk Relay output board and probably mean the coil instead); but, since you are using the P212S to power your relay coils, you should be OK as it will provide two amps of current, or in other words, you can have 40 or so relays on at once.
Also, you have an Elk TRG2640 shown, do you mean instead TRG2440 (I couldn't find a 2640 on Elk's site)?
Also, you have an Elk TRG2640 shown, do you mean instead TRG2440 (I couldn't find a 2640 on Elk's site)?