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Why won't my fuses fit in my combination ECN enclosed control starter?

Verify the fuse clip rating - both amps and voltage.  If the starter was specified for a 240Vac motor, it would have 250V max fuse clips in it.  The types of fuses that should be used are class R rejection type fuses.  But they must be the correct amp rating and voltage to fit properly.  Class R fuses vary in diameter and length based on theirr voltage and amperage rating.