Don't go unprotected. Electrical accessories can send voltage spikes through your system that can damage everything from light bulbs to diagnostic computers. The safe way to add electrical accessories is with Cirkit Boss, the first circuit isolator that provides both constant and ignition hot circuits. Adding extra ignition hot fused circuits used to mean tapping into an existing wire or into a spare circuit at the fuse block. The better, safer way is to use an add-on, relay activated fuse block. Only a small activation wire from any ignition source is needed to turn on the relay that turns on the fuse block. All Cirkit Boss models are made using TXL cross link polyethylene wire rated to 275� @ 600 volts. All wires are factory machine terminated. Circuits are individually fused for up to 10 amp applications and use a heavy duty 30 amp relay. Every Cirkit Boss includes a 30 amp in-line circuit breaker, relay, mounting hardware, & an assortment of terminals.