I See Electromagnetic Fields!
- Mar 28, 2020
I like Ben but I disagree with that video and would never use an AC breaker for 48VDC which in this case is really 54Vdc.
AC breakers depend on Zero crossing and that does not exist with DC. You get an Arc going in that breaker and it won't matter if it fly's open. It may work and it may not but I would not take the chance.
QO breakers (at least some of them) are DC rated. Two pole breaker interrupting circuit and that voltage isn't a problem.
Short-circuit current interrupt rating may not be high enough for lithium, need to figure out battery bank capability and wire resistance.
Some other breakers (e.g. from Midnight) have higher ratings, as do some fuses.