Originally Posted by Kanaris /forum/post/15490002
Then you can make your own...
You need to go to any electrical supply house and get a 20 amp contactor with a 120v relay in it... then power it's relay with those cheap remote control units like I described above.. which will trigger the 20 amp contacts to close and open..
I did something similar to this. I use a Niles AC-3 12-volt trigger off my Rotel receiver, to energize 2 separate 2 pl/20amp/120v coil contactors, each in their own boxes. Each contactor controls a 20-amp circuit; one supplies two Aragon 8008 amps, for my main L/C/Rs (also to a seperate relay which turns on a closet ventilation motor). The other for two Mackies and a Rythmik amp, for subs.
If you enclose them in large enough boxes, you can line the box with insulation, reducing the switching noise (and sometimes the contactors might buzz a little). I use 8x8x6 boxes.
In the trades, this is called "slaving out the relay" (I'm an ex-HVACer tech). The idea is to not load up the low voltage circuit too much, thereby not dropping the 12 volts to where it will not operate the relay coils.
At one time I was using a multichannel preamp, instead of the rotel, that didn’t have 12 v triggers or switched outlets. I had to use a Xantech current sensing unit, to switch on a 12 volt power supply, to energize the Niles AC-3, in turn to turn on the relay boxes...worked fine, but talk about a mouse trap