Im not good with electrical, but as far as I understand, the are like most other switches and can be run through a relay, or off a switch so that they see almost no current.
They are used on ARB's new compressor, which must pull 20-25amps constant.
Hook up Im not sure. I just had a look at Fugs from his kit when he had it over.
Had me drooling compared to those stupid none sealed, lunchbox sized princess jobbies.
Fug can tell you more, he hooked his up a little while back. Im sure it would ground though. Pretty sure thats how the diapham works. Engages and disconnects the ground.