JT&T Products; Fusible link wire is designed to "open" a circuit when electrical current overload occurs. This "opening" of the circuit stops the current and prevents damage to electrical instruments or to accessories, and is most often used when the placement of a fuse is not possible. Meets or exceeds S.A.E. J-156 specifications. A fusible link is not intended to be used in place of a fuse, only where a fuse cannot be used. When replacing fusible link, the wire gauge used should be 4 gauges smaller than the existing wiring circuit.