GENERAC RTSN400K3 RTSN400K3 - ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4,200.83
GENERAC RTSN400K3 RTSN400K3 - 400 Amp Transfer Switch 277/480 3Ø NEMA 3R CUL

GENERAC RTSN400K3 RTSN400K3 - 400 Amp Transfer Switch 277/480 3Ø NEMA 3R CUL

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Model: RTSN400K3
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$4,200.83
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RTSN400K3 - 400 Amp Transfer Switch 277/480 3Ø NEMA 3R CUL

  • Features

    • Designed for use with three-phase generators 60-kw and below
    • The Heavy Duty Generac Contactor is a cUL recognized device, designed for years of service
    • When used in tandem with Smart Management Modules, up to 8 loads can be managed as well, providing the most installation efficient power management options available
    • Digital Power Technology (DPM) allows these switches to have the capability to manage up to 4 individual HVAC (24 VAC controlled) loads with no additional hardware
    • RTSN400K3
    • Three-phase, 277/480-volt; cUL listed
    • Generac Automatic Transfer Switches are housed in an aluminum NEMA/UL Type 3R enclosure, with electrostatically applied and baked powder paint

  • Certifications and Standards

    • UL Listed

Manufacturer Resources

Product Specs

Amperage:
400 A
Assembled Weight:
130 lbs
Color Finish:
Grey
Country Of Origin:
United States
Installation Hardware Included:
transfer switch
Installation Instructions Included:
Yes
Manufacturer Warranty:
5 year limited
Maximum Generator Input:
48000 W
Overall Depth:
17 in
Overall Height:
52 in
Overall Width:
25 in
Restrictions:
No
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Transfer Switch
Product Voltage:
120 V
Product Material:
Aluminum
Product Weight:
130 lbs

Generac RTSN400K3 – Frequently Asked Questions

1) Will the Generac RTSN400K3 transfer switch work with a 277/480V three-phase generator?
Yes. The RTSN400K3 is a three-phase, 277/480-volt automatic transfer switch rated 400 amps, built for three-phase generators of 60 kW and below. If your standby set is single-phase or 120/240V, this is the wrong switch.
2) Can the RTSN400K3 be mounted outdoors?
Yes. The enclosure is aluminum, NEMA/UL Type 3R, with electrostatically applied and baked powder paint in grey, so it is rated for outdoor wall or pad mounting.
3) How much wall space and clearance do I need for a 400 amp Generac RTSN transfer switch?
Plan for an enclosure 52 inches high, 25 inches wide and 17 inches deep, weighing 130 lbs. At that weight it is a two-person lift or a mechanical assist, and the backing needs to carry it if you are wall mounting.
4) What is the largest generator I can put on the RTSN400K3?
The switch is rated for a maximum generator input of 48,000 W and is intended for three-phase generators 60 kW and below. Size the set to stay within that input rating.
5) Can this Generac transfer switch shed HVAC loads without adding hardware?
Yes. Digital Power Management lets the switch control up to four individual HVAC loads using 24 VAC control, with no extra modules. Add Smart Management Modules and the total managed load count goes to eight.
6) Is the RTSN400K3 listed for commercial installation?
It is UL Listed and cUL listed, and the Generac heavy duty contactor inside it is a cUL recognized device. That covers both US and Canadian inspection on a commercial standby install.
7) What comes in the box with the Generac RTSN400K3, and do I need anything else?
You get the transfer switch itself with installation instructions. Conduit, conductors, lugs beyond what is factory fitted, and any Smart Management Modules for extra load shedding are separate. The switch is a 400 amp service-side device, so the feeder and overcurrent protection are part of the job, not the carton.
8) What part number should I put on the submittal for a Generac 400A 277/480V 3-phase NEMA 3R transfer switch?
Specify Generac RTSN400K3. That is the manufacturer part number for the 400 amp, 277/480V three-phase, NEMA 3R automatic transfer switch.
9) Is the RTSN400K3 made in the USA?
Country of origin on the RTSN400K3 400 amp transfer switch is the United States, which matters if you are procuring against a domestic-content requirement.
How fast can I get the Generac RTSN400K3 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Generac RTSN400K3 come with a warranty?
Absolutely. The Generac RTSN400K3 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Generac RTSN400K3?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Generac RTSN400K3 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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