Dumb question: You said in the original post that this breaker feeds "some vital UPS equipment and another computer equipment panelboard". I can't tell from that whether the other panelboard is behind the UPS, or is separate from the UPS.
If it's behind the UPS, perhaps you can have the UPS take the load while you change out the trip unit at 2:00 AM Sunday morning?
[This message has been edited by SolarPowered (edited 08-21-2004).]
