What stands out about the model PSR-SCP-24UC/ESA4/2X1/1X2 2963750 is how it helps avoid mix-ups during replacements.
Foxboro, Relay Kit, C0136XQ
You will find that the relay stays cool to the touch even after repeated cycles, which adds confidence during longer testing sessions.
What stands out about NULL type, implying it's a simple, no-frills option.