Generac RTSC400A3 400A 1ph-120/240V Nema 3R Automatic Transfer Switch Features:
Generac RTSC400A3 400-Amp ATS Features:
The Generac RTSC400A3 Automatic Transfer Switch is built for homeowners needing large-capacity, seamless standby power switching for single-phase (120/240V) electrical systems. With a 400A rating, this switch can manage very high loads, making it ideal for homes with large electrical service panels or multiple high-demand appliances. It senses when utility power fails, automatically transfers your power load to your standby generator, and then returns to utility when it's back to acceptable levels—no manual intervention needed.
What makes the RTSC400A3 smart is its integrated load management. It can switch off or shift non-critical circuits—up to four HVAC loads—without requiring extra modules, helping to reduce the total generator capacity you’ll need. This keeps costs lower and system sizing simpler. For even more load control, you can expand with optional Smart Management Modules (SMMs) to handle additional loads as needed.
It’s built tough. The switch is housed in a NEMA 3R-rated aluminum enclosure suitable for outdoor or indoor installations, designed to resist rain, snow, ice, and debris. Internal components are heavy-duty, rated for high amperage, and engineered for frequent automatic switching. It carries a 5-year limited warranty for reassurance, and is designed to work with Generac’s Evolution and Nexus generator controllers so timing and sensing are integrated into the generator side of your system.
Key Features
-
400 Amp automatic transfer switch for single-phase, 120/240V systems
-
Non-service entrance rated (cannot serve as main disconnect)
-
Supports automatic open-transition switching between utility and generator power
-
Integrated load management—manages up to 4 HVAC loads without additional hardware
-
Option to expand load shedding/additional load modules via Smart Management Modules
-
NEMA 3R aluminum enclosure, weather-resistant and suitable for outdoor/sheltered installation
-
Uses Generac’s heavy-duty contactor and construction built for rugged, frequent operations
-
Compatible with Generac Evolution™ and Nexus™ generator controllers
-
Covered by a 5-year limited warranty
