Bussmann BP/HHM-RP ATM In-line fuse holder with cover - 30 amp max - in-line fuse holders for mini fuses. Body material withstands high temps. Protective cover has removable straps. A fuse must be properly and fully inserted into the holder to provide a solid connection. Poor or improper insertion of the fuse can result in failure of the fuse and holder, thus not protecting the device for which it was intended. Fuses Not Included. When selecting a fuse holder, always match the device to the wire being fused. Using an undersized fuse holder will increase electrical resistance in the circuit and reduce performance.