Littelfuse LFC600603CID Powrgard Fuse Blocks (New)Features and Benefits DIN Rail (snap to release) mountable optional Universal mounting holes make for easy replacement Rejection feature that prevents the insertion of fuses with lower interrupting rating or voltage ratings Clip design reduces resistance and heat Non DIN Rail fuse blocks have interlocking feature allowing ganging to produce a fuseblock with any number of poles Covers available for most amperages