ABB Spec-Setter Heavy-Duty Fus...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$399.30
ABB Spec-Setter Heavy-Duty Fusible Safety Switch, NEMA 1

ABB Spec-Setter Heavy-Duty Fusible Safety Switch, NEMA 1

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Model: TH4322
$399.30

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

$399.30
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ABB Spec-Setter Heavy-Duty Fusible Safety Switch, NEMA 1

The ABB Spec-Setter heavy-duty fusible disconnect switch is built for commercial and industrial electrical systems that demand rugged, reliable disconnect protection. Rated 600V and housed in a NEMA 1 indoor enclosure, this heavy-duty switch is engineered for tough commercial and industrial applications where dependable overcurrent isolation is essential. As part of ABB's extensive safety switch lineup, the Spec-Setter series is designed to be rugged, reliable, and easy to install for electricians and facility teams alike.

Key Features

  • Voltage Rating: 600V construction supports demanding higher-voltage commercial and industrial electrical distribution systems.
  • Heavy-Duty Application: Built for the toughest commercial and industrial environments requiring dependable disconnect performance.
  • Fusible Switch Design: Accepts fuses to provide overcurrent protection ahead of downstream equipment and circuits.
  • NEMA 1 Enclosure: Indoor-rated housing suited to general commercial and industrial indoor installations.
  • Rugged, Reliable Construction: Part of ABB's Spec-Setter safety switch line, built for rugged, reliable, and easy-to-install service.

Certifications & Compliance

  • NEMA 1 (Indoor) Enclosure Rating

Technical Specifications

  • Country of Origin: Unknown / Contact Manufacturer
  • Standard: Yes

Typical Applications

  • Commercial and Industrial Electrical Distribution
  • Heavy-Duty Disconnect Switching
  • Indoor Panelboard and Equipment Rooms
  • Emergency and Backup Power Disconnect Points
  • Renovation and New Construction Electrical Projects

Why ABB?

ABB safety switches are engineered for rugged, reliable, and easy-to-install performance across residential, commercial, and industrial electrical systems. The Spec-Setter heavy-duty line is purpose-built for demanding environments where dependable fusible disconnect protection at 600V, backed by a NEMA 1 indoor enclosure, is critical to keeping electrical systems safe and code-compliant.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Safety Switch
Configuration:
NEMA 1 Enclosure
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Safety Switches & Disconnects

ABB TH4322 – Frequently Asked Questions

1) What amperages and voltages does the ABB Spec-Setter fusible disconnect come in?
Four ampere ratings across two voltage classes: 30A, 60A, 100A and 200A. The 600V versions are TH3221 (30A, 2-pole), TH4321 (30A, 3-pole), TH4322 (60A, 3-pole), TH4363 (100A, 3-pole) and TH4364 (200A, 3-pole). The 240V versions are TH4321R (30A), TH4322R (60A), TH4323 (100A) and TH3364 (200A). Pick the voltage class at or above your system voltage, then the ampere frame at or above the fuse size you intend to install.
2) Do fuses come with the ABB Spec-Setter fusible safety switch?
The switch is the fusible type, meaning it accepts fuses to provide overcurrent protection ahead of the downstream equipment, but the fuses themselves are a separate order. Size and class them to the load and to the ampere frame of the switch you buy, whether that is the 30A, 60A, 100A or 200A version.
3) Can an ABB Spec-Setter fusible safety switch be installed outdoors or in a washdown area?
No. The ABB Spec-Setter fusible safety switch is housed in a NEMA 1 enclosure, which is indoor-rated and suited to general commercial and industrial indoor installations such as panelboard and equipment rooms. For outdoor, wet, or corrosive washdown locations, the Square D VisiPacT VH324NDSGL is a heavy duty fused safety switch in a NEMA 4X stainless steel enclosure, which is the rating intended for those environments. Both are fused heavy-duty switches, so the difference is the enclosure, not the disconnect function.
4) What is a non-fused alternative to the ABB Spec-Setter TH4363 when the branch circuit already has upstream overcurrent protection?
The ABB Spec-Setter TH4363 is a fusible heavy-duty disconnect, meaning it accepts fuses to provide overcurrent protection ahead of downstream equipment. If the circuit is already protected upstream and you only need a local disconnecting means, the Square D VisiPacT unfused heavy duty safety switch VHU361N is an unfused NEMA 1 switch. Going unfused removes the fuse cost and the need to stock spare fuses, but it also removes the local overcurrent protection the ABB fusible unit provides, so the upstream device has to be sized to protect the load.
5) Will an ABB Spec-Setter safety switch work as a generator or emergency power transfer disconnect?
The ABB Spec-Setter is a single-throw fusible disconnect and is used at emergency and backup power disconnect points, but it isolates one source only. To switch a load between two sources, such as utility and generator, you need a double-throw switch. The Eaton K-series heavy-duty double-throw non-fused safety switch DT223UGK is a painted steel NEMA 1 double-throw unit built for that job. Use the ABB Spec-Setter where you need fused isolation of a single feed, and a double-throw unit where the load has to be transferred between two feeds.
6) What is the difference between a 2-pole and a 3-pole ABB Spec-Setter switch?
Pole count has to match the conductors you are switching. TH3221 is the 2-pole 600V unit at 30A, suited to a single-phase or two-wire ungrounded feed. The 3-pole 600V units, TH4321, TH4322, TH4363 and TH4364, switch all three ungrounded conductors of a three-phase feed. Ordering a 2-pole for a three-phase motor leaves a live leg at the equipment.
7) Is the Square D VisiPacT VHU361N a direct replacement for an ABB Spec-Setter TH4364?
Not directly. The ABB Spec-Setter TH4364 is a 200 ampere, 3-pole, 600V fusible disconnect in a NEMA 1 enclosure, while the Square D VisiPacT VHU361N is an unfused heavy duty NEMA 1 switch. Both are heavy duty and share the indoor NEMA 1 enclosure class, but the ABB unit carries fuses for overcurrent protection and the VisiPacT unfused unit does not. If your drawing calls for a fused disconnect at that location, the unfused switch will not satisfy it without adding protection elsewhere in the circuit.
8) Is the ABB Spec-Setter a heavy-duty or general-duty safety switch?
Heavy duty. The Spec-Setter fusible line is built for commercial and industrial distribution rather than light residential service, which is what you want at equipment rooms, backup power disconnect points, and renovation or new-construction feeders where the switch will see repeated operation.
9) Where can I find full dimensions and wire ranges for the ABB TH series safety switch?
ABB publishes a spec sheet for the Spec-Setter line, and it is linked on the product record under the spec sheet PDF. That document is the place to confirm enclosure dimensions, conduit knockout locations, and lug wire ranges before you lay out the wall or size the feeders.
How fast can I get the ABB TH4322 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 TH4322 come with a warranty?
Absolutely. The ABB TH4322 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 TH4322?
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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