You must follow what is on the Tag of the unit if the only type of protection listed on the tag is fuses you must use fuses.
Some tags will say "Fuse or HCAR Breaker" then you can use either
You must also use the size listed. If the tag says 25 Amp fuse that is what you must use even if your branch circuit is #10 with a 30 amp breaker.
2002 NEC 440.52(A)(3) and as always 110.3(B)
[This message has been edited by iwire (edited 03-17-2003).]
