I ran into this problem, an AC unit is fed from a busduct, the busduct has a fused disconnect switch the fuse rated at 225A type-J, the AC unit is fed thru VFD, a local 200AS/200AF fused disconnect switch (Fuse type-RK5) is located upstream of the VFD, the problem is the 225A fuse by the busduct blow out before the local 200A Fuse, looking at the time current curves that will make sense to happen, I have tried to use get two fuses from the same manufacture but no luck, any other ideas?
Thank you
Thank you