What is the Generac Smart Switch 400 Amp 120/240V NEMA 3R used for?

It is an automatic transfer switch (ATS) designed to safely transfer power between the utility grid and a Generac standby generator, providing reliable whole-home or light commercial backup power.

Is the Generac Smart Switch 400 Amp service entrance rated?

Yes, this model is service entrance rated and includes a built-in disconnect breaker, eliminating the need for a separate service panel.

Can the Generac Smart Switch handle large electrical loads?

Yes, it supports single-phase systems up to 400 amps, making it ideal for large residential homes and light commercial applications.

Does the Generac Smart Switch work outdoors?

Yes, it comes in a NEMA 3R weather-resistant enclosure that protects against rain, snow, and corrosion.

How does the Generac Smart Switch transfer power?

The switch continuously monitors utility power. During an outage, it signals the generator to start and automatically transfers load to generator power. Once utility power returns, it switches back and shuts down the generator.

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Generac Smart Switch 400 Amp Service Rated 120/240 1Ø NEMA 3R Generac Smart Switch 400 Amp Service Rated 120/240 1Ø NEMA 3R

Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R

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Generac Smart Switch 400 Amp Service Rated 120/240 1Ø NEMA 3R Generac Smart Switch 400 Amp Service Rated 120/240 1Ø NEMA 3R

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SKU PES-PS-GEN-0353

OEM Authorized Dealer BABA Compliant Full OEM Warranty 7-10 Business Day Delivery

$3,093.45 USD

$ $3,093.45 USD

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Generac Smart Switch 400 Amp Service Rated 120/240 1Ø NEMA 3R Generac Smart Switch 400 Amp Service Rated 120/240 1Ø NEMA 3R $3,093.45

Specifications

Amperage 400A

NEMA Rating NEMA 3

What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R — Reliable Whole-Home Power Transfer

The Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R is a premium automatic transfer switch (ATS) designed for seamless integration with Generac standby generators. Built for single-phase systems up to 400 amps, this Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R model provides a safe, smooth, and fully automatic transition of power between the utility grid and backup generator. It features a durable outdoor-rated enclosure and advanced load management capabilities, ensuring reliable operation for large residential and light commercial applications.

Product Features

Smart Automatic Power Transfer

Automatically senses power outages and transfers electrical load to the generator, restoring utility power once normal supply resumes.

Service Entrance Rated

This Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R includes a built-in disconnect breaker, eliminating the need for a separate service panel.

Advanced Load Management

Compatible with Generac Smart Management Modules (SMM) for intelligent load prioritisation and efficient generator capacity use.

Weather-Resistant NEMA 3R Enclosure

Outdoor-rated aluminium enclosure offers superior corrosion resistance and long-lasting durability even in harsh weather conditions.

Seamless Compatibility

Pairs perfectly with Generac air-cooled and liquid-cooled standby generators, supporting both residential and light commercial systems.

How It Works

The Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R continuously monitors the incoming utility line. Upon detecting an outage, it signals the generator to start, then automatically transfers load power to the generator output. When utility power is restored, it safely switches back and shuts down the generator.

Specifications

Model	RTSW400A3
Amperage	400 Amp
Voltage	120/240 V AC
Phase	Single Phase
Enclosure Rating	NEMA 3R (Outdoor Rated)
Service Rated	Yes
Poles	2-Pole
Operating Temperature Range	-22 °F to 140 °F (-30 °C to +60 °C)
Compatibility	Generac Air-Cooled & Liquid-Cooled Generators
Dimensions (L × W × H)	42 × 24 × 12 in (1066 × 610 × 305 mm)
Weight	≈ 110 lb (49.9 kg)
Mounting	Wall Mount
Warranty	5 Years (Limited Manufacturer Warranty)
Manufacturer	Generac Power Systems

Specifications verified from official Generac datasheet (RTSW400A3).

What is your return policy?

What’s covered by your return policy?

How long will it take to receive my order?

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R — Reliable Whole-Home Power Transfer

Product Features

Smart Automatic Power Transfer

Automatically senses power outages and transfers electrical load to the generator, restoring utility power once normal supply resumes.

Service Entrance Rated

This Generac Smart Switch 400 Amp Service Rated 120/240V Single-Phase NEMA 3R includes a built-in disconnect breaker, eliminating the need for a separate service panel.

Advanced Load Management

Compatible with Generac Smart Management Modules (SMM) for intelligent load prioritisation and efficient generator capacity use.

Weather-Resistant NEMA 3R Enclosure

Outdoor-rated aluminium enclosure offers superior corrosion resistance and long-lasting durability even in harsh weather conditions.

Seamless Compatibility

Pairs perfectly with Generac air-cooled and liquid-cooled standby generators, supporting both residential and light commercial systems.

How It Works

Specifications

Model	RTSW400A3
Amperage	400 Amp
Voltage	120/240 V AC
Phase	Single Phase
Enclosure Rating	NEMA 3R (Outdoor Rated)
Service Rated	Yes
Poles	2-Pole
Operating Temperature Range	-22 °F to 140 °F (-30 °C to +60 °C)
Compatibility	Generac Air-Cooled & Liquid-Cooled Generators
Dimensions (L × W × H)	42 × 24 × 12 in (1066 × 610 × 305 mm)
Weight	≈ 110 lb (49.9 kg)
Mounting	Wall Mount
Warranty	5 Years (Limited Manufacturer Warranty)
Manufacturer	Generac Power Systems

Specifications verified from official Generac datasheet (RTSW400A3).

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