Square D DTU Non-Fusible Doubl...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,740.60
Square D DTU Non-Fusible Double Throw Safety Switch, 100A NEMA 3

Square D DTU Non-Fusible Double Throw Safety Switch, 100A NEMA 3

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Model: DTU223RB

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

$1,740.60
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Square D DTU Non-Fusible Double Throw Safety Switch, 100A NEMA 3

The Square D DTU double throw safety switch from Schneider Electric delivers tough, reliable performance in demanding commercial and industrial power distribution installations. This non-fusible, double throw switch is rated 100A at 240V AC / 250V DC and housed in a NEMA 3 enclosure. This listing is available in 2-pole and 3-pole configurations, allowing installers to match the switch to single-phase or three-phase source-transfer applications while sharing the same 100A rating, voltage rating, and NEMA 3 enclosure across both pole counts. A bolt-on hub provision adds installation flexibility, and the unit is UL Listed for code-compliant use.

Key Features

  • Amperage Rating: 100A supports reliable double throw source-transfer switching.
  • Operational Voltage: Rated 240V AC and 250V DC (Ue) for AC and DC systems.
  • Pole Configuration: Available in 2-pole and 3-pole versions to suit single-phase and three-phase transfer applications.
  • Non-Fusible Double Throw Design: Manual double throw switching without fuses, simplifying maintenance.
  • Bolt-On Hub Provision: Bolt-on hub prep adds flexibility for conduit connections.
  • Wire Range: Accepts AWG 14...AWG 1/0 copper and AWG 12...AWG 1/0 aluminum, tightening torque 35-45 lbf.in.
  • Enclosure Rating: NEMA 3 degree of protection for outdoor and industrial environments.
  • Device Type: LV equipment - LV fuse-switch, non-fusible disconnect switch.

Certifications & Compliance

  • UL Listed
  • Meets or exceeds NEMA KS1
  • Free of Substances of Very High Concern above the threshold (REACH)
  • Mercury Free
  • RoHS Exemption Information on file

Technical Specifications

  • Toxic Heavy Metal Free: Yes
  • Warranty Period: 18 months
  • Sustainable Packaging: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Serviceability: No
  • With Recycled Cardboard: Yes
  • China ROHS In Scope: No
  • Reach Free Shvc: Yes
  • Legacy WEEE Scope: In
  • Packaging Made With Recycled Cardboard: Yes
  • Without Single Use Plastic: Yes
  • ROHS Exemption Information: Yes
  • WEEE Product Category: 4
  • Mercury Free: Yes
  • ROHS Eur In Scope: Yes
  • China ROHS Label: 1
  • Environmental Disclosure: ENVPEP2503028_V1
  • Function Option Id: STANDARD
  • Average Life Duration: 15 year(s)
  • Take Back: No

Typical Applications

  • Commercial and Industrial Power Distribution
  • Manufacturing Facility Electrical Systems
  • Manual Double Throw Source Transfer Switching
  • Outdoor and Harsh Environment Installations (NEMA 3)
  • Panelboard and Service Entrance Switching

Why Square D?

Square D by Schneider Electric engineers its DTU double throw safety switches for durability and reliable performance under grueling conditions, backed by an 18-month warranty and UL Listing. With a NEMA 3 enclosure and construction that meets or exceeds NEMA KS1, this switch delivers dependable, code-compliant power switching for industrial and commercial environments, whether specified in 2-pole or 3-pole configuration.

Manufacturer Resources

Product Specs

Product Type:
Safety Switch
Amperage Rating:
100A
Voltage Rating:
240V
Configuration:
Non-Fusible Double Throw
Standards:
NEMA 3
Listing:
UL Listed
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Safety Switches & Disconnects
Product Width:
11.96 in
Country Of Origin:
United States
Product Height:
30.5 in
Product Depth:
6.93 in

Square D DTU223RB – Frequently Asked Questions

1) Can the Square D DTU double throw switch be mounted outdoors?
The DTU safety switch comes in a NEMA 3 enclosure, which is rated for outdoor and harsh industrial locations. It also has a bolt-on hub provision, so you can bring conduit in through a rated hub rather than drilling the enclosure and compromising the rating.
2) Do I need the 2-pole or 3-pole version of the Square D DTU 100A double throw switch?
Pick by the system you're transferring. The 2-pole DTU223RB suits single-phase source transfer; the 3-pole DTU323RB suits three-phase. Both carry the same 100A rating, 240V AC / 250V DC rating, and NEMA 3 enclosure, so the only decision is pole count.
3) Is the Square D DTU an automatic transfer switch?
No. The DTU is a manual double throw switch, non-fusible, so an operator moves the handle to transfer between the two sources. If you need unattended transfer on a generator start, this is the wrong device type.
4) Does the Square D DTU switch need fuses?
No fuses. It's a non-fusible disconnect, so overcurrent protection has to come from upstream breakers or a fused device elsewhere in the distribution. If you want the protection inside the disconnect itself, look at a fusible switch such as the ABB TG-Series general duty fusible safety switch instead.
5) What is the closest alternative to the Square D DTU223RB double throw switch if an indoor enclosure is acceptable?
The Eaton heavy-duty double-throw non-fused safety switch in painted steel is the nearest match in function: it is also a double-throw, non-fused design, and it is built in a NEMA 1 enclosure for indoor use. The Square D DTU is a non-fusible double throw rated 100A at 240V in a NEMA 3 enclosure, which is intended for outdoor and harsh-environment mounting. If the switch sits inside a mechanical room or electrical closet, the NEMA 1 Eaton unit covers the same manual source-transfer duty; if it is exposed to weather, stay with the NEMA 3 DTU.
6) Can I use an Eaton DH366URK in place of a Square D DTU323RB?
No - they do different jobs. The DH366URK is a K Series non-fusible safety switch rated 600A in a NEMA 3R enclosure, which is a single-throw disconnect for one source. The Square D DTU323RB is a 3-pole non-fusible double throw switch rated 100A at 240V, built to transfer a load between two sources manually. A single-throw disconnect cannot perform source transfer, and the 600A frame is a far larger device. Use the DH366URK only where you need a service or feeder disconnect, not a transfer switch.
7) My drawing calls for fuses in the disconnect - what should I order instead of the Square D DTU?
The DTU is a non-fusible design, so it provides no overcurrent protection and cannot accept fuses. For a fusible switch, the ABB TG-Series Spec-Setter is a general duty fusible safety switch, and the ABB TC-72367 Spec-Setter is a heavy-duty fusible switch, 3-pole, 600V AC, in a NEMA 1 enclosure. Note that both are single-throw devices, so if the drawing also calls for two-source transfer you will need a separate fusible double throw rather than a substitution from this group.
8) Is the Square D DTU double throw switch UL Listed and does it meet NEMA KS1?
UL Listed, and the construction meets or exceeds NEMA KS1. That covers the usual inspector questions on a commercial or industrial service switching application.
9) What's an alternative to the Square D DTU if my double throw switch is going indoors?
The Eaton K-series heavy-duty double-throw non-fused safety switch is the comparable indoor option, painted steel in a NEMA 1 enclosure. The Square D DTU's NEMA 3 enclosure is the one to use outdoors; for a clean mechanical room, NEMA 1 is the usual spec.
10) The load is 400A - is there a larger switch than the 100A Square D DTU?
Yes, but not in a double throw form from the closest alternatives. The ABB THN3365A is a heavy-duty safety switch rated 400A, 3-pole, 600V, and the Eaton DH366URK is a K Series non-fusible switch rated 600A in a NEMA 3R enclosure. Both are single-throw disconnects. The Square D DTU tops out at 100A at 240V, so for a 400A service you move to one of the larger frames and handle transfer separately if it is required.
11) Which safety switch should a facility standardize on for a light-duty, indoor, cost-sensitive 240V branch disconnect?
For a straightforward indoor branch disconnect where fuses are wanted, the ABB TG-Series Spec-Setter is a general duty fusible safety switch and is the simpler device in this group. The Square D DTU is a heavier-purpose part: non-fusible double throw, 100A at 240V, in a NEMA 3 enclosure, UL Listed, with a 30.5 in high by 11.96 in wide by 6.93 in deep body. Specify the DTU where you actually need two-source manual transfer or an outdoor-rated enclosure; a general duty single-throw switch is the right fit for simple on-off isolation indoors.
12) What is the difference between the Square D DTU double throw switch and the Eaton K-series double-throw switch beyond the enclosure?
Both are double-throw, non-fused manual transfer switches, so the switching function is equivalent. The differences a buyer works from are enclosure and ratings: the Eaton unit is a painted steel NEMA 1 heavy-duty double-throw switch, while the Square D DTU uses a NEMA 3 enclosure and is rated 100A at 240V AC / 250V DC, offered in 2-pole as DTU223RB and 3-pole as DTU323RB, with a bolt-on hub provision for conduit entry and wire range of AWG 14 to 1/0 copper.
13) Where is the Square D DTU safety switch made?
The DTU double throw switch is manufactured in the United States, which matters if your project carries domestic sourcing requirements.
How fast can I get the Square D DTU223RB 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 Square D DTU223RB come with a warranty?
Absolutely. The Square D DTU223RB 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 Square D DTU223RB?
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
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