Richard Landreth posted:
...What gauge wire would be best to use?
Whatever wire gauge came with the switch and controller would work fine - probably AWG 24 or so. Note that the "large" current only flows momentarily when the switch flips position.
But so I'm clear, which implementation are you thinking of? You can buy a latching relay module off-the-shelf from, say, Azatrax for about $14 plus $8 shipping:
It has screw-terminals so you don't have to mess with soldering. And their AC version directly handles AC coil voltage so you don't have to mess with DC. But if, for example, the 10-15V operating voltage of the Azatrax latching relay is not suitable for however fast/slow you run your trolleys, then perhaps more assistance is in order. If you're on top of all this, then you're on your way and I await to hear how it works out!
OTOH I'm the consummate cheap-skate and have been known to amuse myself fiddling with low-cost eBay free-shipping-from-Asia gadgets where you can get it done for closer to $5 though you have to mess around with more wiring.
