PLUGS INTO PC BOARD ON FURNACES BOILERS AIR HANDLERS OR ANY SYSTEM WITH A FUSED PCB. MAXIMUM AMPERAGE OF 5 AMPS. FEATURES/ BENEFITS UL STYLE""""MARGIN-TOP0PX;PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"""" AUXILIARY WIRES FOR MORE APPLICATIONS. BUILT-IN LIGHT FOR DARK HARD TO REACH AREAS. FOR LOW VOLTAGE CIRCUIT TESTING W/O WASTING FAST-BLOW FUSES. NOT FOR FOR PERMANENT USE DOES NOT REPLACE A FACTORY ACCEPTED FUSE.