What stands out about the build is the relay base w/ relay made from heat resistant material.
4 Channel AC/DC 24V Rail Mount Relay Interface Module, G2R-1-E
with this relay, you get the trusted Potter name without any complicated setup or fuss.
You will find that the Relay Bypass Switch Kit simplifies rewiring when swapping out a relay.
What stands out about this listing is that you get a 2 pack of relays in one order.