The safe way to add electrical accessories to any vehicle is with a CirKit Boss. The first circuit isolator system available with both constant and ignition-hot circuit kits. Kits include an in-line circuit breaker, relay, relay/fuse block base with preterminated harness and mounting hardware and terminals. Protects your OEM and is easy to install. Provides three ignition-hot circuits with a maximum total amperage handling of 40 Amps. This kit includes: 40-amp SPST relay, 40-amp circuit breaker, Relay base/fuse block with harness, Crimp-on terminals and mounting hardware.