Now you can select a switch with any appearance or current rating and leave the dirty job of reliable high current switching to the ARC relay module. This unit contains four 40-amp plug-in relays and input fuse connectors for late model ATO blade-style fuses. If your car already possesses the required fusing, the unit can be wired to a point which bypasses its built-in fusing. This unit also features replaceable lugless connectors. Measures 5-1/8'' long x 1-7/8'' wide.High Current Relay Module Top Veiw: