The General Purpose Relay works well in simple automation setups, and swapping one out takes only minutes.
Hasco HS212 6V DC Polarized Relay DC6 6 Volt DPDT
If you want a simple switch that can manage more current, you will find that this power relay works well.
A that Dayton labels its relays clearly, so you don't have to guess at specs.
A nice touch is the gentle tension in the terminals on this unbranded relay, which grips wires without crimping them hard.
The relay carries the TMC brand, and that matters when you want consistent performance over time.
The General Purpose Relay feels sturdy in hand, and the clicking action is satisfying during on and off cycles.