Automatic Transfer Switch Black, AC120V 15A Key benefits Keeps critical loads powered automatically by switching between two AC inputs: AC Input 2 for utility or shore power and AC Input 1 for inverter or generator. No manual intervention required when the utility source changes. Minimizes interruption to sensitive electronics with a transfer time under 30 milliseconds. Most computers and smart devices continue operating through the switch event. Improves electrical switching reliability with a four power SPST relay design that prevents arcing common in DPDT designs. Live and Neutral are switched together while ground conductors remain continuously connected for consistent grounding. Built for indoor or outdoor use thanks to an IP68 rated, flame retardant polycarbonate enclosure with a silicone rubber seal and 304 stainless steel screws. Designed to resist moisture and dust in demanding environments. Technical highlights Operating range: AC 90 to 135V, 50 or 60 Hz Maximum continuous current: 15A Transfer time: less than 30 milliseconds Relay configuration: four SPST relays, both Live and Neutral switched Ground connection: continuous internal grounding Enclosure: IP68 rated polycarbonate with silicone rubber seal and 304 stainless steel fasteners Color: Black Compatible input sources: utility, shore power, inverter, generator Why this switch solves common problems Eliminates manual switching between backup and utility power, preventing missed transfers during outages. Reduces risk of relay arcing and contact wear by using independent power relays for each conductor. Maintains continuous grounding while switching live and neutral, helping stabilize system behavior during transfers. Durable enclosure protects electronics from moisture and dust where other switches may fail. Practical applications RV and camper shore power management: Automatically transfer loads to onboard inverter power when shore power is lost and switch back when shore power returns. Marine systems: Seamlessly switch between shore power and generator or inverter on boats, with a waterproof enclosure suited to wet environments. Home backup systems and off grid installations: Coordinate power between utility, generator, and inverter sources for critical circuits like routers, home office equipment, or sump pumps. What to check before installation Confirm system voltage is within AC 90 to 135V and that connected loads do not exceed 15A. Use appropriate wiring and circuit protection sized to your installation and local electrical codes. Verify the intended AC inputs correspond to AC Input 1 for inverter or generator and AC Input 2 for utility or shore power. This automatic transfer switch is a compact, reliable solution for automatic source selection between inverter or generator power and utility or shore power while offering fast transfers, robust relay design, and a weather resistant enclosure for versatile installations.