ABB THN3365A 400A 3P 600V Heav...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,009.70
ABB THN3365A 400A 3P 600V Heavy-Duty Safety Switch

ABB THN3365A 400A 3P 600V Heavy-Duty Safety Switch

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Model: THN3365A1

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

$2,009.70
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ABB THN3365A 400A 3P 600V Heavy-Duty Safety Switch

When it comes to getting the job done right, you can count on safety switches from ABB. The ABB THN3365A Series heavy-duty safety switch is rated 400A, 3-pole, 600V AC, and is available with a choice of enclosure rating — NEMA 1 for general-purpose indoor installations or NEMA 3R for rainproof outdoor duty — making it well suited for demanding commercial and industrial power distribution applications. Part of ABB's extensive heavy-duty switch lineup, this Spec-Setter design delivers a rugged, reliable, and easy-to-install disconnect solution for facilities that require dependable manual switching. Whether protecting motor circuits, feeders, or distribution equipment, this switch is built to stand up to continuous industrial duty regardless of which enclosure option you select.

Key Features

  • Amperage Rating: 400A rating supports high-capacity circuit disconnect and load-break switching duties.
  • Poles: 3-pole configuration for three-phase power distribution and equipment isolation.
  • Voltage Rating: 600V AC rating suits demanding industrial and commercial power systems.
  • Enclosure Options: Available in NEMA 1 for general-purpose indoor installations or NEMA 3R for rainproof outdoor installations, letting you match the switch to the application environment.
  • Heavy-Duty Application: Engineered for the demands of commercial and industrial environments where general-duty switches fall short.
  • Rugged, Spec-Setter Design: Built by ABB for reliable, easy-to-install performance in continuous-duty settings.

Certifications & Compliance

  • NEMA 1 Enclosure Rating (Indoor option)
  • NEMA 3R Enclosure Rating (Rainproof outdoor option)

Technical Specifications

  • Number Of Poles: 3
  • Amperage Rating: 400A
  • Voltage Rating: 600V AC
  • Enclosure Rating Options: NEMA 1 (Indoor) or NEMA 3R (Rainproof)

Typical Applications

  • Commercial and Industrial Power Distribution
  • Motor Circuit and Feeder Disconnects
  • Manual Load-Break Switching
  • Indoor General-Purpose Installations (NEMA 1)
  • Outdoor Rainproof Installations (NEMA 3R)
  • Industrial Facility Upgrades and Retrofits

Why ABB?

ABB is a trusted name in safety switches, offering a wide range of general-duty and heavy-duty designs built for the toughest industrial environments. The THN3365A Series reflects ABB's Spec-Setter commitment to rugged, reliable, and easy-to-install switching equipment — available in NEMA 1 or NEMA 3R enclosures — that helps keep commercial and industrial electrical systems safe and code-compliant.

Manufacturer Resources

Product Specs

Product Type:
Safety Switch
Series:
THN3365A
Voltage Rating:
600V
Amperage Rating:
400A
Configuration:
3-Pole
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Safety Switches

ABB THN3365A1 – Frequently Asked Questions

1) Is the ABB THN3365A safety switch available in an outdoor rainproof enclosure, or only indoor NEMA 1?
Both. The THN3365A comes in a NEMA 1 indoor enclosure (MPN THN3365A1) and a NEMA 3R rainproof enclosure (MPN THN3365AR). Same 400A, 3-pole, 600V switch inside either way. If the disconnect is going on an exterior wall, a rooftop unit, or anywhere it sees weather, order the 3R version; NEMA 1 is general-purpose indoor only.
2) Will the ABB THN3365A work on a 480V three-phase motor feeder?
Yes. The THN3365A is rated 600V AC, so 480V three-phase is well inside its rating, and the 3-pole configuration switches all three ungrounded conductors. At 400A it is sized for motor circuit and feeder disconnect duty as well as manual load-break switching.
3) Can the ABB THN3365A be used as a transfer switch between two sources?
No - the ABB THN3365A is a single-throw manual disconnect for isolating a circuit, feeder, or motor branch. Selecting between two supplies requires a double-throw device, such as the Eaton K-series heavy-duty double-throw non-fused safety switch in painted steel with a NEMA 1 enclosure. That is a common substitution error because both are called heavy-duty safety switches.
4) What is the closest unfused heavy-duty disconnect alternative to the ABB THN3365A?
The ABB THN3365A is a 400A, 3-pole, 600V heavy-duty safety switch. If you need an unfused heavy-duty disconnect from another line, the Square D VisiPacT unfused heavy duty safety switch in a NEMA 1 enclosure covers the same general-purpose indoor duty. The difference to confirm before ordering is overcurrent strategy: the VisiPacT unit is specifically an unfused switch, so branch protection has to come from upstream devices.
5) I need a disconnect with integral fuses instead of the ABB THN3365A - what should I look at?
The Square D VisiPacT heavy duty fused safety switch is the fused counterpart to consider. It carries fuse provisions in the switch itself, and it is built in a NEMA 4X stainless steel enclosure rather than the general-purpose indoor NEMA 1 housing the ABB THN3365A uses. That makes it a different decision on two fronts at once - fusing and environment - so verify both against the one-line drawing.
6) What is the difference between a heavy-duty safety switch like the ABB THN3365A and a general-duty switch?
Heavy duty is the spec for commercial and industrial service. ABB builds the THN3365A for continuous industrial duty in power distribution, motor circuits, and feeders, at 600V and 400A. General-duty switches are the lighter-service class and, as ABB puts it, fall short in those environments. If the drawing calls out a heavy-duty disconnect, or the circuit is a 480V three-phase feeder, this is the class you want.
7) Is the ABB THN3365A fused or non-fused?
The THN3365A is ABB's heavy-duty disconnect switch rated 400A, 3-pole, 600V. If your design needs the disconnect itself to carry overcurrent protection, look at a fusible heavy-duty switch such as the Square D VisiPacT fused heavy duty switch; if you only need a means of disconnect ahead of a breaker or starter, an unfused switch like the Square D VisiPacT unfused heavy duty in NEMA 1 covers that. Match the choice to whether your overcurrent protection lives upstream.
8) Does the ABB THN3365A switch the neutral, or do I need a separate neutral kit?
It is a 3-pole switch, so it opens the three phase conductors only. A grounded neutral runs through unswitched, which on a solidly grounded wye system is normal practice. If your installation requires a bonded neutral landing point inside the enclosure, plan on a neutral assembly as a separate item; the switch itself is specified as 3-pole 600V, 400A.
9) Does the Eaton double-throw K-series switch work as a drop-in replacement for an ABB THN3365A?
It does not. The Eaton K-series unit is a double-throw non-fused switch, meaning it has two sets of line terminals for alternate sources, while the ABB THN3365A is a 400A 3-pole 600V single-throw disconnect with one line and one load side. The enclosure footprint, wiring gutter space, and conduit entry layout differ accordingly, so treat it as a redesign rather than a swap.
10) If I want a disconnect where I can visually verify blade position, what is the alternative to the ABB THN3365A?
Both Square D comparables are VisiPacT designs - the fused NEMA 4X stainless steel version and the unfused NEMA 1 version - a series built around visible-blade confirmation of the open position. The ABB THN3365A is a Spec-Setter heavy-duty switch rated 400A, 3-pole, 600V and is specified where rugged continuous industrial duty is the priority.
11) Is a painted steel enclosure like Eaton's an acceptable substitute for the ABB THN3365A housing?
For indoor general-purpose locations, painted steel is the usual construction, and the Eaton K-series double-throw switch uses a painted steel NEMA 1 enclosure. The ABB THN3365A is also offered in NEMA 1 for indoor service plus a NEMA 3R rainproof version for outdoor mounting. Where corrosion or washdown is a factor, the stainless steel NEMA 4X VisiPacT construction is the one specified instead of painted steel.
How fast can I get the ABB THN3365A1 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 THN3365A1 come with a warranty?
Absolutely. The ABB THN3365A1 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 THN3365A1?
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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