Best Automatic Transfer Switches for Home Generators

Why an Automatic Transfer Switch Matters for Home Generators

An automatic transfer switch (ATS) is the unsung hero of any home backup power system. Without it, you would need to manually flip breakers and plug cords into a portable generator every time the grid goes down — often in the dark, during a storm, and under stress. An ATS detects a utility power outage, starts your standby generator, and transfers the electrical load to the generator within seconds. When grid power returns, it switches the load back and shuts the generator down safely.

Choosing the right ATS depends on your generator size, your home's electrical service rating, whether you want whole-house or essential-circuit coverage, and whether you need smart monitoring features. Below are the 7 best automatic transfer switches for home generators, ranked by reliability, capacity, and value.

1. Generac RTSW200A3 Service Rated Transfer Switch

Generac is the most recognized name in home standby power, and the RTSW200A3 is one of its most popular service-rated switches. It handles 200 amps and works with Generac's Guardian and Protector series generators. Because it is service rated, it includes a built-in disconnect and circuit breaker, which simplifies installation and can reduce the number of separate boxes on your wall.

The switch uses a mechanically held contactor that only draws power during transfer, which means lower standby energy consumption. It also supports Generac's Wi-Fi and Mobile Link monitoring, so you can check generator status from your phone. For homeowners with a Generac generator, this is the natural first choice.

2. Kohler RXT Series Automatic Transfer Switch

Kohler's RXT series is a strong alternative for homeowners who want a service-rated switch with fast transfer times. The RXT200 runs at 200 amps and pairs with Kohler's residential generators, including the 14kW and 20kW models. Transfer time is typically under 10 seconds, which keeps sensitive electronics from rebooting.

The RXT uses a robust contactor design and offers optional load-shedding modules, so you can power large loads like an electric range or central air without upsizing your generator. Kohler's OnCue Plus remote monitoring adds another layer of convenience. If you already own a Kohler generator, the RXT is the matching switch to buy.

3. Reliance Controls Pro/Tran 2 Transfer Switch

If you use a portable generator rather than a permanently installed standby unit, the Reliance Controls Pro/Tran 2 is one of the best manual transfer switches that still offers a semi-automatic experience. It comes in 6-, 10-, and 12-circuit configurations and installs next to your main panel. You plug your generator into an inlet box, then flip the individual circuit breakers to move selected loads to generator power.

While it is not fully automatic, the Pro/Tran 2 is affordable, easy to install, and ideal for essential-circuit coverage. It prevents backfeeding, which is a serious safety hazard, and it lets you choose exactly which circuits run during an outage. For budget-conscious homeowners with a portable generator, this is a top pick.

4. Eaton ATS Service Entrance Rated Switch

Eaton makes some of the most durable transfer switches on the market. Its service entrance rated ATS models come in 100, 200, and 400 amp versions and are compatible with most major generator brands, including Generac, Briggs & Stratton, and Cummins. The service entrance rating means the switch can be installed between the meter and the main panel, eliminating the need for a separate disconnect.

Eaton switches use a double-throw contactor with silver alloy contacts for long life and reliable switching. They also offer optional surge protection and metering. If you want a brand-agnostic switch that will work with whatever generator you choose, Eaton is an excellent option.

5. Cummins PowerCommand Automatic Transfer Switch

Cummins is a heavy-duty name in power generation, and its PowerCommand ATS brings commercial-grade reliability to residential installations. The switch is available in 100 to 400 amp ratings and pairs seamlessly with Cummins QuietConnect home generators. It features a programmable controller that can manage load shedding, exercise cycles, and remote monitoring.

The PowerCommand line is known for fast, reliable transfers and excellent build quality. It is a bit more expensive than entry-level switches, but for homeowners who want a set-and-forget system with advanced diagnostics, the investment is worth it. Cummins also offers strong dealer support across the country.

6. Briggs & Stratton 100-Amp Automatic Transfer Switch

Briggs & Stratton's 100-amp ATS is a solid mid-range choice for smaller homes and essential-circuit setups. It is designed to work with the company's standby generators and includes a 16-circuit load center, so you can power specific rooms without installing a separate subpanel. The switch is service rated and includes a built-in disconnect.

Installation is straightforward, and the unit is NEMA 3R rated for outdoor use. If your home has a 100-amp service or you only need to back up a handful of critical circuits, this switch offers good value. It also supports Briggs & Stratton's InfoHub monitoring system for remote status checks.

7. ASCO Series 300 Automatic Transfer Switch

ASCO is a premium brand in the transfer switch world, and the Series 300 is a favorite for homeowners who want maximum configurability. It is available in 100 to 400 amp ratings and supports both single-phase and three-phase power. The switch uses a reliable solenoid-operated mechanism and offers optional bypass isolation, which lets you service the switch without interrupting power.

ASCO switches are often used in light commercial applications, so they are overbuilt for most homes — which is exactly why they last. They integrate with a wide range of generator brands and can be paired with ASCO's power management software. For a top-tier, future-proof installation, the Series 300 is hard to beat.

How to Choose the Right Automatic Transfer Switch

Before buying, check three things: your home's electrical service amperage (usually 100, 200, or 400 amps), your generator's output and starting wattage, and whether you want whole-house or essential-circuit coverage. Also confirm that the switch is compatible with your generator brand, since some manufacturers use proprietary communication protocols.

Finally, always hire a licensed electrician for installation. A transfer switch is a critical safety device that prevents backfeeding and protects utility workers. Done right, it will keep your lights on for years to come.