Power Transfer Switch; 57 Series; Transfers Power Between Shore And Generator; Used With Arterra WF-8900 Series Power Inverters; Automatic; 120 Volt AC; 50 Amp; 5 Inch Width x 5-5/8 Inch Height x 5 Inch Depth Product Info Designed to provide trouble-free changeover of power between shore power and generator. This is used for a 30 Amp or 50 Amp AC service. Mounts easily onto a flat surface and is engineered for safe, reliable performance. The unit’s DC coil prevents AC "chatter" noise and drop-out in low-voltage conditions. Accidental coupling of power from or to shore line and generator is prevented by a "break before make" configuration. Weight: 9.7500 Function: Transfers Power Between Shore And Generator Voltage: 120 Volts AC Ampere Rating: 50 Ampere Length (IN): 5 Inch Width (IN): 5 Inch Height (IN): 5-5/8 Inch Color: Black Mounting Type: Floor Features Designed To Provide Trouble-Free Changeover Of Power Between Shore Power And Generator Accidental Coupling Of Power From Or To Shore Line And Generator Is Prevented By A "Break Before Make " Configuration Mounts Easily Onto A Flat Surface And Is Engineered For Safe, Reliable Performance Limited 2 Year Warranty