MB Quart 4-Circuit Relay Bank The Gmr-Rb4, a 4-circuit relay bank, offers universal compatibility and plug-and-play convenience for effortless integration with the Gmr7V1 Source Unit. Capable of handling up to four 20-amp circuits, it facilitates the easy addition and management of 12V accessories. Its installation is made simple with a three-wire connection, and the built-in LED indicators promptly signal any blown fuses. It is an excellent choice for efficient power management across various vehicle configurations. Features: Plug-and-play For Gmr7V1 Source Unit (sold separately) Four 12V circuits 80A(max) total / 20A(max) per circuit JST connector to the female JST connector Know which fuse is blown via the glowing LED indicator