Description
Generac RTSW400A3 Automatic Smart Transfer Switch Overview
The Generac RTSW400A3 is a 400-amp automatic smart transfer switch for 120/240-volt single-phase service. It is made for use with Generac generators that run an Evolution or Nexus controller. Generac’s Digital Power Management technology lets the generator cycle power on and off as needed for different appliances, so the generator is not asked to carry every load at once.
The switch is service entrance rated, with load-side and line-side disconnect breakers, and it installs between the main meter and the service panel. It can manage up to four individual HVAC loads with no extra hardware, such as air conditioners, water heaters and well pumps on 24 VAC control. Up to eight Smart Management Modules, sold separately, can be added to extend load control. Specifications list a maximum of 96,000 watts, 400 amps for both generator and utility input, 60 Hz operation, 2 poles and built-in load shedding and load prioritizing. The enclosure is a NEMA 3R aluminum box with a gray powder-coat finish, and the switch is UL listed, with lugs accepting #4 or 2-250 MCM wire.
Key Features
- Digital Power Management that cycles loads on and off as needed
- Manages up to four HVAC loads without additional hardware
- Accepts up to eight Smart Management Modules, sold separately
- Frequency monitoring design that needs no control wire
- Load prioritizing and lock-out of non-essential loads
- Service entrance rated, installed between the main meter and service panel
- NEMA 3R indoor/outdoor aluminum enclosure, wall mountable, with gray baked powder coating
Who It’s For
Owners of a single-phase Generac generator with an Evolution or Nexus controller who want a 400-amp switch that prioritizes loads and manages HVAC equipment. It suits homes and small buildings where the switch serves as the service entrance disconnect, backed by a one-year limited warranty.
Specifications
| Model | RTSW400A3 |
| Brand | Generac |
| Maximum Wattage | 96,000 Watts |
| Voltage | 120/240 Single-Phase |
| Frequency | 60 Hertz |
| Rated Amps | 400 Amps |
| ATS Service Disconnect | Yes |
| ATS Poles | 2 Poles |
| ATS Load Shedding | Built-In |
| ATS Load Prioritizing | Built-In |
| Max Generator Input | 400 Amps |
| Max Utility Input | 400 Amps |
| Enclosure | Outdoor NEMA 3R |
| Enclosure Material | Aluminum |
| Lug Range | #4 or 2 – 250 MCM |
| UL Listed | Yes |
| Weight (lbs.) | 140 (63.50 kgs) |
| Dimensions (LxWxH)(in.) | 48 x 22 x 10 (121.92 x 55.88 x 25.40 cm) |
Frequently asked questions
Which generators work with the Generac RTSW400A3?
It is made for Generac generators that run an Evolution or Nexus controller on 120/240-volt single-phase service. The frequency monitoring design needs no control wire between the switch and the generator.
Where is the RTSW400A3 installed?
The switch is service entrance rated, with load-side and line-side disconnect breakers, and it installs between the main meter and the service panel. Its NEMA 3R aluminum enclosure is wall mountable for indoor or outdoor use and has a gray baked powder coating.
How many loads can the Generac RTSW400A3 manage?
It manages up to four individual HVAC loads with no extra hardware, such as air conditioners, water heaters and well pumps on 24 VAC control. Up to eight Smart Management Modules, sold separately, can be added to extend load control through Digital Power Management.
What are the RTSW400A3 electrical ratings?
Specifications list a maximum of 96,000 watts, 400 amps for both generator and utility input, 60 Hz operation, 2 poles and a 22,000 amp withstand rating. Lugs accept #4 or 2-250 MCM wire, and the switch is UL listed.
How big and heavy is the switch?
The listing gives dimensions of 48 x 22 x 10 in (121.92 x 55.88 x 25.40 cm) and a weight of 140 lb (63.50 kg). A one-year limited warranty is listed for the RTSW400A3.
Buying advice: read our guide to automatic vs manual transfer switches, or browse all automatic transfer switches.
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