Once installed, the ARD4UR model keeps things tidy, and you will find that the labeling makes future checks much easier.
MEASUREMENT TECHNOLOGY MTL 2211 2-CHANNEL IS-INPUT SWITCH OPERATED RELAY 24VDC
What stands out about this one is the Model 700-P400A1 label, which makes reorders quick and painless.
you will find that this relay comes from Functional Devices, Inc., a brand I do trust.