Quote:
Originally Posted by jeff5may
If you're running low voltage (24vdc or less), contact arcing is less of a problem and regular AC rated contactors can work. Once the voltage goes up above about 50vdc, the contactors with magnets inside must be used. When the switch contacts open, the magnets repel the arc and blow it out.
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I was involved in the design/build of Chicago's 3200 series transit cars which operate on 600VDC. We wanted to redesign a disconnect due to space considerations. GE said sorry, all the engineers that did that sort of thing were dead. We got a 50 year old design and made it fit.
Your comments immediately made sense. Those disconnects had huge blast chutes.
You and Mike are probably right about using solid state devices. As for Mike's suggestion to vent any excess heat through the window, it just occurred to me the garage could always take the unused heat. That would keep the condensation down.
Thank you both for the help.