A fuse holder including a housing defining an enclosed region and an opening to the enclosed region, a pair of contacts at opposite ends of the enclosed region and spaced to engage end cap terminals on the ends of a tubular fuse moved into the enclosed region, and a fuse carrier that is pivotally mounted on the housing at the housing opening and movable between a closed position, in which the contacts electrically engage the end cap terminals and the opening is closed by the carrier, and an open position, in which a fuse can be inserted into the fuse carrier, the fuse carrier defining an elongated fuse insertion region for receiving the tubular fuse, one end of the region being sized to receive a small diameter projection on the end of the tubular fuse but to block a full diameter end of a fuse of the same diameter, the opening to the housing being sized to permit closure of the carrier with a tubular fuse having a small diameter projection in the one end, but to block closure of a fuse having the same overall length but a full diameter end at the one end of the fuse insertion region.