I took one apart to see the inside: 1. The contacts inside are small. I doubt the contacts will withstand 200 amps. They are just too small.2. Completely new! The contacts are already partially burned from the factory!3. There is no DC or AC voltage range on E9 type circuit breakers. They don't have a tuned circuit inside to break the arc. A small plastic flange slides between the contacts, interrupting the arc. It will probably work equally well at 12 VDC or 200 VDC.4. The mechanism that actuates the plastic flange is quite weak and therefore slowly moves the flange into place. I bet under load the contacts will wear out before the arc breaks!
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