What does UL say about it. Would it void UL listing I wouldn't touch the appliance. If its commercial does it have a max fuse size listed, is the SO factory. I would look at the nameplate and factory cord size. Maybe up the feeder size after calculating the length of run but still keep the 30a brk recept and factory cord. Why use 125% is it there an inductive load to?If it's got a 30a line cord and trips a 30a brk it is a sign that there’s something wrong like low volts or leakage to ground(which can kill) by not tripping a 40a brk near as fast as a 30a if at all which brings me back to the UL question. I always Check for ground potential (chassis to chassis) with all metal objects in reach of my kitchen installations
