Dual input, 4 element question

[jeffmeh]

Yes, you need to switch after the load for what you are doing. And I think you can use those Auber mini spdt contactors without anything wired to the NO terminal, if you want to save some space, with a basic 3-position rotary switch.

 

[machfive55]

The auber mini contactors are great. They even come with terminals, although the terminals aren't the best. So far they seem to be working well although I haven't put them under the load yet. That test is coming soon.

 

[jeffmeh]

I have a few other suggestions, If I may.

After your hot lines enter the panel, use a switch and a 2 pole contactor, running both hot lines through the contactor. This would be your main power switch, and when off, the only parts of your panel that have hot lines to them are the switch and the line terminals of the contactor.

If you want, you can wire a 120v LED indicator light in parallel with each element. This would show you when each element is actually receiving power.

Have fun.