have different classifications. Some of them include Class H and K. These two classes are considered full-size and have either 250V or 600V voltage rating. Their amp ratings can go as 600A. Their difference is with the current-limiting and interrupt specifications. Class H, for instance, can only provide 10,000A interrupt capacity. K fuses, on the other hand, can be 50,000A or 100,000A. Class K fuses can be K1 or K5. Bussmann offers K5 and H fuses. Here at MRO Supply, you can get them. Our K5 and H fuses from Bussmann are all certified authentic and brand-new. Browse our huge selection now.