Do not disconnect under load

[Skagit]

If they are QO's from Square D it's perfectly acceptable.

I've built a few load centers for small DC system load center of Square QO breakers and panels. Many years of trouble free service. I recently did some more digging into this and discovered you can use them for up to 125V DC.

Here's the tech note from Schneider.

Are QO load centers suitable for use on a 125V DC application? | Schneider Electric USA

Interesting, even though the breakers say they are only rated for 48v DC? And they want you to use 2p breakers to disconnect both legs.