Generac 400-Amp Service-Rated Automatic Transfer Switch – Model RTSW400A3

The Kohler 400-Amp ATS (Automatic Transfer Switch) is designed to serve as the primary service disconnect while automatically transferring power between utility and generator sources during an outage. Engineered for high-capacity standby generator systems, this service-rated ATS delivers dependable, hands-free operation and code-compliant power management.

Built to Generac’s performance and safety standards, the RTSW400A3 is ideal for large homes or light commercial applications requiring a 400-amp service entrance solution. It ensures reliable backup power transfer, system protection, and long-term durability in demanding installations.

Specifications

Model Number: RTSW400A3

Amperage Rating: 400 Amps

Switch Type: Service-rated automatic transfer switch

Function: Automatic power transfer and service disconnect

Application: Large residential and light commercial standby generator systems

Compatibility: Generac standby generators