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I don't really remember but I got them from auber instruments, along with the box, heatsink, switches, ssrs, pids. and rtd temp sensors. I think that I used the 2 pole, 40/50 amp, 120V coil relay wired to the on off key switch, and the 2 pole, 30/40 amp, 120V coil relay wired to each element. I was going to add some pictures of my control panel, but nothing happens when I click the "Add Images" button.