Abstract: A fused electrical connector having a molded body containing a fuse receptacle with a keyed construction. The keyed construction of the fuse receptacle is complementary to the fuse itself or a keyed construction attached to the fuse such that only a fuse having the correct key can be fitted to a particular connector. The keyed construction of the fuse receptacle may include channels and recesses which cooperate with formations on body parts which fit around a standard cartridge fuse. The keyed construction of the fuse receptacle may also include a central block which cooperate with a non-standard cartridge fuse.