ABB THF Spec-Setter Fused Heav...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,310.00
ABB Spec-Setter Fused Heavy-Duty Safety Switch, 400A, 240V, NEMA 1

ABB THF Spec-Setter Fused Heavy-Duty Safety Switch

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Model: THF3225A1

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

$2,310.00
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ABB THF Spec-Setter Fused Heavy-Duty Safety Switch

The ABB THF Spec-Setter fused heavy-duty safety switch delivers rugged, reliable disconnect protection for demanding commercial and industrial power distribution. This switch platform is available with a Number of Poles Available of 2 or 3, and a Voltage of 240 volts or 600 volts, letting electrical contractors match the exact configuration to the application while relying on the same proven Spec-Setter construction. Every configuration is housed in a NEMA 1 (Indoor) rated enclosure and engineered for the toughest heavy-duty applications where dependable, code-compliant performance is essential. Backed by ABB's decades of experience in electrical safety switches, the Spec-Setter line is built for straightforward, trouble-free installation in industrial and commercial facilities, giving contractors a single trusted family to standardize on across projects of varying pole count and voltage class.

Key Features

  • Configuration Options: Choose between 2-pole and 3-pole configurations to match circuit and equipment requirements.
  • Voltage Options: Offered in 240 volt and 600 volt ratings to cover a wide range of commercial and industrial distribution needs.
  • Fused Heavy-Duty Design: Fused disconnect construction supports demanding commercial and industrial power distribution and equipment disconnect needs.
  • Enclosure: NEMA 1 (Indoor) rated enclosure suited for indoor commercial and industrial installations across all pole and voltage configurations.
  • Heavy-Duty Application: Purpose-built for commercial and industrial environments that demand rugged, dependable disconnect switches.
  • Easy Installation: Rugged Spec-Setter design simplifies mounting and wiring for electrical contractors regardless of the selected pole count or voltage.

Certifications & Compliance

  • NEMA 1 (Indoor) Enclosure Rating

Technical Specifications

  • Number of Poles Available: 2, 3
  • Voltage: 240 volts, 600 volts
  • Enclosure Rating: NEMA 1 (Indoor)

Typical Applications

  • Commercial and Industrial Electrical Distribution
  • Safety Disconnect for Motors and Fixed Equipment
  • Indoor Panelboard and Load Center Feeder Disconnects
  • Heavy-Duty Industrial Facilities and Processing Plants
  • Renovation and New Construction Electrical Upgrades

Why ABB?

ABB's Spec-Setter heavy-duty safety switches are engineered for the rugged demands of commercial and industrial electrical systems, offering a NEMA 1 enclosed, fused disconnect platform built for reliability across 2-pole and 3-pole, 240 volt and 600 volt configurations. This flexibility lets contractors standardize on a single trusted switch family while still matching the exact pole count and voltage class each job requires, all without sacrificing dependable, code-compliant performance where uptime and safety matter most. Choose ABB for a trusted safety switch platform built to keep industrial and commercial facilities running.

Manufacturer Resources

Product Specs

Product Type:
Safety Switch
Amperage Rating:
400A
Voltage Rating:
240V
Configuration:
Heavy-Duty Fused Disconnect
Standards:
NEMA 1
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Safety Switches

ABB THF3225A1 – Frequently Asked Questions

1) Is the ABB Spec-Setter THF safety switch fused or non-fused?
Fused. The Spec-Setter THF heavy-duty safety switch is a fused disconnect, so fuses have to be ordered separately and sized to the circuit it is protecting. If you want a disconnect with no overcurrent device in it, look at an unfused unit instead, such as the Square D VisiPacT heavy duty unfused switch in a NEMA 1 enclosure.
2) What pole and voltage combinations does the ABB Spec-Setter THF switch come in?
Three builds: 2-pole 240V (THF3225A1), 3-pole 240V (THF4325A1), and 3-pole 600V (THF3365A1). Pick the 600V unit for 480V or 600V three-phase equipment feeds; the 240V units cover single-phase 240V and 240V three-phase work.
3) Will a 2-pole 240V safety switch work as a disconnect for a three-phase motor?
No. A 2-pole switch opens two conductors, which covers single-phase 240V loads. A three-phase motor needs all three ungrounded conductors switched, so order the 3-pole version: THF4325A1 at 240V or THF3365A1 at 600V.
4) Can I use the 240V ABB Spec-Setter on a 480V panel?
No. The 240V THF units are rated 240V maximum and putting them on a 480V system is a code and safety violation. Use the 600V-rated THF3365A1, which covers 480V and 600V systems.
5) I need a fused heavy-duty disconnect that can be mounted outdoors or in a washdown area instead of the ABB Spec-Setter THF. What should I use?
The ABB Spec-Setter THF is supplied in a NEMA 1 enclosure, which is rated for indoor use only. For an outdoor or corrosive/washdown location, the Square D VH324NDSGL is a VisiPacT heavy duty fused safety switch in a NEMA 4X stainless steel enclosure, so you keep the fused disconnect function while getting an enclosure suited to wet and corrosive environments.
6) What is the difference between the ABB Spec-Setter fused heavy-duty safety switch and the Square D VisiPacT unfused heavy-duty switch?
The ABB Spec-Setter THF is a fused heavy-duty disconnect, so it carries fuses inside the enclosure and provides overcurrent protection along with the disconnect means. The Square D VHU361N is a VisiPacT heavy duty unfused switch in a NEMA 1 enclosure, meaning it isolates the circuit but relies on upstream overcurrent protection. If the drawing calls for a fused disconnect at the equipment, the ABB Spec-Setter is the fused option; if the feeder is already protected at the panel and you only need a local disconnecting means, the unfused Square D covers that.
7) Can I use an Eaton double-throw switch in place of the ABB Spec-Setter THF safety switch?
They do different jobs. The ABB Spec-Setter THF is a single-source fused disconnect available in 2-pole 240V, 3-pole 240V and 3-pole 600V builds. The Eaton DT-223UGK is a heavy-duty double-throw non-fused switch, which is a transfer device for selecting between two sources, such as utility and generator, and it does not hold fuses. Use the double-throw only where a source transfer is actually required; for a straight fused equipment disconnect, the ABB Spec-Setter is the correct part.
8) Is the ABB Spec-Setter THF rated for a 400 amp service disconnect?
The Spec-Setter THF is rated 400A, which suits it to feeder and equipment disconnect duty at that ampacity. Fuse size still governs the actual overcurrent protection, so the fuses you install set the trip point, not the switch frame.
9) Do I get fuses with the ABB Spec-Setter THF disconnect?
No. It ships as a fusible switch, meaning the fuse clips are there but the fuses themselves are a separate order sized to the load you are protecting. Budget for a matching set of Class fuses at the amperage your design calls for.
10) For an indoor 600V three-phase motor disconnect, is the ABB Spec-Setter or the Square D VisiPacT the closer match?
The ABB Spec-Setter THF line includes a 3-pole 600 volt build in a NEMA 1 indoor enclosure, which lines up with an indoor 600V three-phase motor disconnect. The Square D VHU361N is also a NEMA 1 heavy duty switch but is unfused, so it would need the overcurrent protection handled upstream. Where the motor branch requires fuses at the disconnect, choose the fused ABB Spec-Setter.
11) We are standardizing our plant on one heavy-duty disconnect platform. How do the ABB Spec-Setter, Square D VisiPacT, and Eaton K-series lines differ?
All three are heavy-duty switch platforms, but they cover different needs. The ABB Spec-Setter THF is the fused disconnect line, offered in 2-pole and 3-pole configurations at 240V and 600V in NEMA 1. Square D VisiPacT spans both a fused NEMA 4X stainless build and an unfused NEMA 1 build, so it covers corrosive and outdoor areas. Eaton's K-series DT-223UGK is a painted steel NEMA 1 double-throw non-fused switch for source transfer. A plant standardizing on fused indoor disconnects would build around the ABB Spec-Setter and add the NEMA 4X Square D only where the environment demands it.
12) What does ABB's Spec-Setter THF get used for in a commercial building?
Typical uses are motor and fixed-equipment disconnects, indoor panelboard and load center feeder disconnects, and electrical upgrades on renovation or new construction in commercial and industrial facilities. All of it indoor work, given the NEMA 1 enclosure.
How fast can I get the ABB THF3225A1 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 ABB THF3225A1 come with a warranty?
Absolutely. The ABB THF3225A1 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 ABB THF3225A1?
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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