I would guess the devices in question are some sort of electric trip unit, along these lines: https://www.eaton.com/content/dam/eaton/products/electrical-circu

I would guess the devices in question are some sort of electric trip unit, along these lines: https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/molded-case-circuit-breakers/power-defense-molded-case-circuit-breakers/power-xpert-release-trip-units-for-power-defense-mn012007en.pdf https://www.eaton.com/content/dam/eaton/products/electrical-... I don’t see anything in the manual about needing to power it down for reconfiguration. All the relevant buttons, set screws, etc should be accessible without removing any dead fronts, so they can be safely accessed while the system is live.