Square D NQ Panelboard Interio...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,268.00
Square D NQ Panelboard Interior, Main Lugs, Copper Bus

Square D NQ Panelboard Interior, Main Lugs, Copper Bus

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Model: NQ442L6C

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

$1,268.00
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Square D NQ Panelboard Interior, Main Lugs, Copper Bus

The Square D NQ Panelboard Interior is a ready-to-install interior assembly designed for commercial buildings, industrial buildings, data centers, stadiums, and offices. Configured with main lugs and a copper (Cu) bus, this NQ interior supports up to 54 pole spaces and is rated 3 phase, 4 wire at 240V AC / 48V DC operational voltage. This interior platform is available across amperage ratings from 400A to 600A to match a range of feeder and motor-circuit load requirements, so the appropriate rating can be selected for the specific installation. Field convertible to top or bottom feed, it is built to UL and CSA standards for dependable, code-compliant power distribution.

Key Features

  • Amperage Range: Available in ratings from 400A to 600A to support varied feeder and load requirements.
  • Pole Spaces: Configured for up to 54 pole spaces to support high circuit-density panelboard layouts.
  • Copper Bus: Cu bus construction delivers reliable current-carrying capacity and conductivity.
  • Main Lugs Connection: Main lugs load center type provided as a ready-to-install interior assembly; also available as main lug or main breaker.
  • Electrical Rating: 3 phase, 4 wire configuration rated 240V AC / 48V DC operational voltage (Ue).
  • Interrupt Rating Options: Available with 10 kA, 22 kA, or 65 kA interrupting current (Iu) ratings.
  • Breaker Compatibility: Accepts QO(VH) plug-in and QOB(VH) bolt-on circuit breakers, including QOB, QHB, and QOB-VH types.
  • Field Convertible: Field convertible to top or bottom feed for flexible installation.
  • Terminal Connections: Line and neutral aluminum lugs accept AWG 1/0...750 kcmil conductors, tightened to 31.07-33.90 N.m.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • RoHS Compliant (ROHS Eur In Scope)
  • Mercury Free
  • Toxic Heavy Metal Free

Technical Specifications

  • Standards: UL-CSA
  • Country of Origin: Mexico
  • Toxic Heavy Metal Free: Yes
  • Warranty: 18 months
  • Mercury Free: Yes
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • China ROHS Label: 1
  • With Recycled Cardboard: Yes
  • WEEE Product Category: 5
  • China ROHS In Scope: No
  • Returnability: Yes
  • China ROHS Regulation: Pro-active China RoHS declaration (out of China RoHS legal scope)
  • Available as main lug or main breaker

Typical Applications

  • Commercial Buildings
  • Industrial Buildings
  • Data Centers
  • Stadiums
  • Offices
  • Panelboard and Load Center Wiring

Why Square D?

Square D NQ panelboard interiors combine a copper bus, main lugs configuration, and UL/CSA-recognized construction to deliver dependable power distribution across a 400A to 600A rating range for demanding commercial and industrial environments. With Mercury Free and Toxic Heavy Metal Free construction plus an 18-month warranty, this interior is engineered for reliable, code-compliant performance backed by Square D's trusted electrical distribution platform.

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Manufacturer Resources

Product Specs

Product Type:
Panelboard Interior
Connection Type:
Main Lugs
Voltage Rating:
240V AC / 48V DC
Configuration:
Main Lugs
Standards:
UL-CSA
Product Material:
Copper
Department:
Electrical
Product Group:
Power Distribution
Amperage Rating:
400A - 600A
Product Subgroup:
Panelboards & Load Centers

Square D NQ442L6C – Frequently Asked Questions

1) Which circuit breakers fit the Square D NQ panelboard interior?
The NQ interior accepts QO(VH) plug-in and QOB(VH) bolt-on breakers, including QOB, QHB and QOB-VH types. If your existing panel schedule is built around QO/QOB branch breakers, they land directly in this interior with no adapter. Breakers from other families will not seat on this bus.
2) What size feeder conductors will the NQ main lugs take, and what is the torque spec?
Line and neutral lugs are aluminum and accept AWG 1/0 through 750 kcmil, so they cover typical 400A and 600A copper or aluminum feeders. Tighten to 31.07 to 33.90 N.m.
3) What short circuit interrupting rating is available on the NQ panelboard interior?
Interrupting current options are 10 kA, 22 kA and 65 kA. Match the rating to the available fault current at the panel location noted on your one-line; a 10 kA interior will not satisfy a spec calling for 65 kA.
4) Is this a complete panelboard or just the guts?
It is the interior assembly only, a ready-to-install 3 phase, 4 wire interior with main lugs and copper bus. The enclosure box and front/trim are separate items, so order those to suit your mounting (surface or flush) and the enclosure type your environment requires.
5) My drawing calls for a 480Y/277V panel. Can I use the Square D NQ interior?
No. The NQ panelboard interior is rated 240V AC / 48V DC, which covers 208Y/120 and 240V systems, not 480Y/277V. For a 480Y/277V three-phase distribution panel, the Eaton Pow-R-Xpress PRL2X unassembled interior panelboard is built for that system voltage. Confirm the amperage and breaker type required before substituting, since the NQ accepts QO(VH) plug-in and QOB(VH) bolt-on breakers and a different line uses its own breaker family.
6) What is the Eaton equivalent of a Square D NQ main lugs panelboard interior?
The closest Eaton counterpart is the Pow-R-Xpress PRL1X series configurable interior panelboard. Both are interior assemblies rather than complete enclosed panelboards, so the box and trim are ordered separately in each case. The Square D NQ interior is rated 240V AC / 48V DC, 3 phase 4 wire, with a copper bus, main lugs, and acceptance of QO(VH) plug-in and QOB(VH) bolt-on breakers, so the breaker population and keying differ from the Eaton line even where the amperage overlaps.
7) What amperage and pole counts does the Square D NQ main lug interior come in?
Ratings run from 400A to 600A. Two configurations are built: NQ454L4C at 400A and NQ442L6C at 600A, with the interior supporting up to 54 pole spaces for high circuit-density layouts.
8) Does the Square D NQ interior have to be fed from the top?
No, it is field convertible to top or bottom feed, so the same interior works whether your conduit comes down from above or up from below. That decision can be made at the opening rather than at order time.
9) Is this a main lug only panel or can I get a main breaker?
As configured, the NQ interior is main lugs, meaning overcurrent protection is upstream at the feeder source. The NQ platform is also offered as a main breaker interior if your installation requires a disconnect and OCPD at the panel itself.
10) Is the Square D NQ interior copper bus or aluminum, and is it UL listed?
Copper (Cu) bus, built to UL and CSA standards and UL Listed / CSA Certified. Specs that call out a copper bus for conductivity and temperature rise will be satisfied by this interior; an aluminum-bus panel would not meet that line item.
11) What are the alternatives to the Square D NQ interior for a panel retrofit?
If you are staying on QO/QOB breakers at 240V, the NQ is the direct Square D interior. On the Eaton side, the Pow-R-Xpress PRL1X is a configurable interior panelboard and the PRL2X is an unassembled interior for three-phase 480Y/277V. Those use Eaton breakers, so swapping brands means replacing branch devices as well as the interior.
12) Is the Eaton Pow-R-Xpress PRL2X a drop-in replacement for a Square D NQ interior?
It is not a drop-in. The PRL2X is an unassembled interior panelboard built for three-phase 480Y/277V service, while the Square D NQ interior is a ready-to-install assembly rated 240V AC / 48V DC with a copper bus and main lugs. The two also use different breaker families, so an existing box, trim, and breaker inventory for one will not carry over to the other. Replacing an NQ interior in place is best done with another NQ interior of matching amperage within the 400A to 600A range.
13) We are standardizing a facility on one panelboard platform. How do the Square D NQ interior and the Eaton Pow-R-Xpress compare for that?
Both are interior-only platforms, so either lets you stock interiors and boxes separately across a building. The Square D NQ interior is UL listed and CSA certified, uses a copper bus, is field convertible to top or bottom feed, and supports up to 54 pole spaces at 240V AC / 48V DC with QO and QOB breakers. Eaton offers the Pow-R-Xpress PRL1X as a configurable interior and the PRL2X for three-phase 480Y/277V. Standardizing on one brand keeps a single breaker family in the stockroom, which is usually the deciding factor for MRO procurement.
How fast can I get the Square D NQ442L6C delivered?
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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 NQ442L6C come with a warranty?
Absolutely. The Square D NQ442L6C 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 NQ442L6C?
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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