GENERAC RTSW100K3 RTSW100K3 - ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3,542.34
GENERAC RTSW100K3 RTSW100K3 - 100 Amp Service Rated 277/480 3Ø NEMA 3R

GENERAC RTSW100K3 RTSW100K3 - 100 Amp Service Rated 277/480 3Ø NEMA 3R

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Model: RTSW100K3
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$3,542.34
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RTSW100K3 - 100 Amp Service Rated 277/480 3Ø NEMA 3R

  • Features

    • The Heavy Duty Generac Contactor is UL recognized device, designed for years of service
    • The controller at the generator handles all the timing, sensing, exercising functions, and transfer commands
    • 100 Amp Service Rated 277/480 3Ø
    • Five year limited warranty
    • Service rated (RTSW) Generac Automatic Transfer Switches are housed in an aluminum NEMA/UL Type 3R enclosure with electrostatically applied powder coating

  • Certifications and Standards

    • UL Listed


RTSW100K3 - spec sheet

Manufacturer Resources

Product Specs

Amperage:
100 A
Assembled Depth:
10.06 in
Assembled Height:
48 in
Assembled Weight:
50 lbs
Assembled Width:
21.82 in
Color Finish:
grey
Country Of Origin:
United States
Installation Hardware Included:
Yes
Installation Instructions Included:
Yes
Manufacturer Warranty:
5 year limited
Maximum Generator Input:
22000 W
Overall Depth:
10.06 in
Overall Height:
48 in
Overall Width:
21.82 in
Restrictions:
No
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Transfer Switch
Product Voltage:
480 V
Product Material:
Aluminum
Product Weight:
50 lbs

Generac RTSW100K3 – Frequently Asked Questions

1) Will the Generac RTSW100K3 transfer switch work on a 277/480V three-phase service?
Yes. The RTSW100K3 is built for 277/480V three-phase at 100 amps, and it is service rated, so it can serve as the service disconnect rather than sitting downstream of one. On a 120/240V single-phase service it is the wrong switch.
2) Can the RTSW100K3 be mounted outdoors next to the generator?
Yes. The enclosure is aluminum, NEMA/UL Type 3R, with electrostatically applied powder coat in grey, so it is rated for outdoor wall mounting. Aluminum also holds up better than steel in coastal or damp locations.
3) What size generator can the RTSW100K3 handle?
Maximum generator input is 22,000 watts. Size the standby set at or below that figure, and keep the connected load within the switch's 100 amp rating.
4) Does this Generac transfer switch have its own controller, or does the generator run it?
The generator's controller does the work. All timing, utility sensing, exercise scheduling and transfer commands come from the controller at the generator; the switch itself carries a heavy duty UL recognized Generac contactor. That means it pairs with a Generac standby unit, not with a generator that expects the switch to supply the logic.
5) How much wall space do I need for the Generac 100 amp service rated transfer switch?
Plan on an enclosure 48 inches tall, 21.82 inches wide and 10.06 inches deep, weighing 50 pounds. It is a tall, narrow cabinet, so check headroom and the working clearance in front of it before you pick the location.
6) Is the Generac RTSW100K3 UL listed for a commercial installation?
The switch is UL Listed, with a UL Type 3R enclosure and a UL recognized contactor. For an inspector, the service rated designation is the other thing to point at: it lets the switch act as the service entrance equipment.
7) Should I buy a service rated transfer switch or a standard one?
A service rated switch like the RTSW100K3 includes the utility disconnect function, so it can be installed as the service entrance equipment and saves a separate disconnect ahead of it. A non-service-rated switch has to go downstream of an existing main disconnect. If your 100 amp 277/480V three-phase service already has a main, you do not need the service rated version.
8) Is anything else needed to mount the RTSW100K3, or does it come with hardware?
Mounting hardware and installation instructions ship with the switch. You still supply conduit, fittings, service and load conductors, and the control wiring back to the generator.
9) Where is the Generac RTSW100K3 made?
It is manufactured in the United States, which matters on public and institutional jobs carrying domestic sourcing requirements.
How fast can I get the Generac RTSW100K3 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 RTSW100K3 come with a warranty?
Absolutely. The Generac RTSW100K3 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 RTSW100K3?
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 RTSW100K3 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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