Industrial-Grade Automatic Power Transfer for High-Voltage Three-Phase Systems

The Generac RTSN400K3 400 Amp Non-Service Rated Automatic Transfer Switch delivers robust, reliable backup power protection for industrial facilities, large commercial buildings, and high-voltage applications with 277/480V three-phase electrical service. Engineered for demanding industrial environments, this transfer switch ensures seamless utility-to-generator transitions that keep your critical operations running during power outages.

Built for High-Voltage Industrial Applications

The 277/480V three-phase configuration is the standard for industrial facilities, large commercial buildings, and high-power applications. With a 400-amp rating, the RTSN400K3 is designed to handle substantial electrical loads including large HVAC systems, industrial machinery, manufacturing equipment, data center infrastructure, and commercial building systems. This transfer switch is engineered to protect these critical systems with automatic switching technology that maximizes uptime and operational continuity.

Key Features & Specifications

• 400-amp rating – handles substantial industrial and commercial electrical demands
• 277/480V 3-phase configuration – designed specifically for high-voltage industrial three-phase electrical systems
• Non-service rated design – installs downstream of your main service disconnect for flexible system design
• Automatic operation – instant power transfer with zero manual intervention required
• NEMA 3R weatherproof enclosure – outdoor-rated for reliable performance in harsh industrial environments
• Generac-engineered integration – seamless compatibility with Generac industrial standby generators
• Fast transfer time – switches to backup power within seconds of detecting utility failure
• Heavy-duty construction – built for long-term reliability in demanding industrial environments

Ideal for Industrial & Large Commercial Applications

• Manufacturing plants and industrial production facilities
• Large commercial office buildings and corporate campuses
• Data centers and mission-critical server facilities
• Hospitals, medical centers, and healthcare campuses
• Educational institutions and university facilities
• Water treatment and wastewater facilities
• Food processing and cold storage operations
• Distribution centers and logistics facilities
• Any facility with 3-phase 277/480V electrical service requiring high-capacity backup power

Non-Service Rated Installation Flexibility

The non-service rated design means this transfer switch installs downstream of your existing main service disconnect. This configuration is ideal for facilities that already have a main electrical panel or where the transfer switch needs to protect specific critical loads rather than the entire electrical service. It provides flexibility in system design and allows for selective backup power distribution to essential equipment and systems.

Automatic Power Transfer for Mission-Critical Operations

When utility power fails, the RTSN400K3 instantly detects the outage, signals your Generac standby generator to start, and automatically transfers your electrical load to backup power once the generator reaches stable operating voltage. When utility power returns, the system seamlessly transfers back and signals the generator to shut down after a proper cool-down period—all completely automatic with no operator intervention required, ensuring continuous operation of critical systems.

Seamless Generac Generator Integration

The RTSN400K3 is designed to work flawlessly with Generac's complete line of industrial standby generators. The transfer switch communicates directly with your generator, coordinating startup sequences, monitoring readiness, managing load transfer, and controlling shutdown procedures—ensuring reliable, coordinated operation of your entire backup power system.

Built for Reliability in Demanding Environments

Housed in a NEMA 3R weatherproof enclosure, this transfer switch is engineered for outdoor installation and long-term reliability in harsh industrial weather conditions. Generac's proven industrial-grade transfer switch technology ensures dependable performance when your facility needs it most, with robust components designed for thousands of switching cycles over decades of service.

Professional Installation Required

This transfer switch must be installed by a licensed electrician familiar with high-voltage three-phase electrical systems and local electrical codes. Professional installation ensures safe, code-compliant operation and proper integration with your existing electrical infrastructure and Generac standby generator system.

Protect your industrial operations and production continuity with heavy-duty high-voltage backup power technology built for the most demanding environments.