Originally Posted by jCOSbrew
If you use a single contactor then the switch would enable the single contactor in both positions. The second set of terminal blocks could route the PID signal to SSR #1 or SSR #2 in a similar manor.
Electrically these are the same, just a different form factor of switch:
Are you saying that if I used these two switches back-to-back that I could get away with a single contactor? (I think I finally understand and that's what you're saying; one switch (the lower amperage one) to control whether the contactor passes power and the other (high amperage toggle-style one) to control to which element the power passes.)
If so, that's a good point and a good design option for someone who's extremely limited on control panel space. (I'm still going to try to squeeze all this into my little box.) -If I have to get rid of something (and I'm pretty sure I don't) I'll get rid of the main power-on switch and contactor and I'll just let the up stream spa panel act as my "main". -The E-stop will turn off power from the control panel, too.
I just placed my full order for all control panel components through Auber so you guys have convinced me to make a 180 degree turn around there.