Brand: Install Bay. MPN: RL3040. New Radio Wiring RelayRadio Wiring Relay; Economy 30/40 AMP;SPECIFICATIONS:WARNING CA Proposition 65: YesWARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.govFEATURES:30/40 Amp Economy RelayThe RL 3040 relay is an electrically operated switch.Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. The coil current can be on or off so relays have two switch positions and most have double throw (changeover) switch contacts. Relays allow one circuit to switch a second circuit which can be completely separate from the first. For example a low voltage battery circuit can use a relay to switch a 230V AC mains circuit. There is no electrical connection inside the relay between the two circuits the link is magnetic and mechanical.We at Metra always strive to listen to our customers. You have told us to do a better job at telling the Metra story. For over 60 years Metra has maintained its cutting edge by paying attention to our marketplace and innovating products to fit the needs of the installer. We are the Installer s Choice because we are installers. We design our products to be easy to use and easy on the eyes. If you can see a Metra product then we haven t done our job. Metra Turbokits are designed to be heard but not seen. This means that our fit and finish is the best in the business. Why trust your installation to a shoddy and time consuming kit? Our GSXL Turbowires are designed with the same philosophy in mind. Their longer length for ease of installation and thicker OEM cables with OEM connectors make for a mighty install with no down time on returns or angry customers.