Good Morning William, The fusible link rule is four numbers smaller than the size of the circuit that it is suppling, ie: '6' gage=7-8-9-"10"fusible link '8' gage=9-10-11-"12" fusible link '10' gage=11-12-13-"14" fusible link '12' gage=13-14-15-"16" fusible li... Login to read more.