Square D NQ Main Lugs Panelboa...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$762.39
Square D NQ Main Lugs Panelboard Interior, 225A, Aluminum Bus, 30-Space

Square D NQ Main Lugs Panelboard Interior, 225A, Aluminum Bus, 30-Space

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Model: NQ430L2

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

$762.39
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Square D NQ Main Lugs Panelboard Interior, 225A, Aluminum Bus, 30-Space

The Square D NQ Main Lugs Panelboard Interior is a ready-to-install interior assembly built for commercial and industrial power distribution. Rated 225A at 240VAC in a 3-phase, 4-wire configuration, this NQ interior features an aluminum bus and provides 30 pole spaces for a wide range of circuit layouts. Versatile and field convertible to top or bottom feed, it is suitable for commercial buildings, industrial facilities, data centers, stadiums, and offices, and is listed to UL and CSA standards.

Key Features

  • Load Center Type: Main lugs configuration rated 225A for dependable power distribution.
  • Aluminum Bus: Aluminum bus bar construction for the panelboard interior assembly.
  • Pole Spaces: 30 pole spaces supporting flexible circuit configurations.
  • Circuit Breaker Compatibility: Accepts QOB-VH, QHB, and QOB bolt-on circuit breakers, and interiors accept QO(VH) plug-in and QOB(VH) bolt-on breakers.
  • Electrical Rating: 3-phase, 4-wire system with Ue rated operational voltage of 240V AC / 48V DC.
  • Interrupt Rating: Iu rated interrupting current of 22 kA, 65 kA, or 10 kA depending on installed breaker type.
  • Connections & Terminals: Line and neutral lugs accept AWG 6...350 kcmil aluminum conductors, with tightening torque of 11.3 N.m (4.52-5.65 N.m for 13.30-67.43 mm² / AWG 6...AWG 2/0).
  • Field Convertible: Field convertible to top or bottom feed for flexible installation.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • Toxic Heavy Metal Free
  • Mercury Free

Technical Specifications

  • Warranty: 18 months
  • Number Of Spaces: 30
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • With Recycled Cardboard: Yes
  • Reach Free Shvc: Yes

Typical Applications

  • Commercial Buildings
  • Industrial Facilities
  • Data Centers
  • Stadiums and Large Venues
  • Office Buildings

Why Square D?

Square D NQ panelboard interiors combine an aluminum bus, main lugs design, and UL/CSA-listed construction to deliver code-compliant power distribution for demanding commercial and industrial projects. With 30 pole spaces, broad QOB-VH, QHB, and QOB circuit breaker compatibility, and field-convertible feed options, the NQ interior gives contractors and facility engineers a reliable, versatile foundation for professional electrical installations.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Interior
Configuration:
Main Lugs, 30-Space
Amperage Rating:
225A
Voltage Rating:
240V
Standards:
UL-CSA
Product Material:
Aluminum
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers
Product Height:
27 in
Product Width:
10.44 in

Square D NQ430L2 – Frequently Asked Questions

1) Does the Square D NQ430L2 panelboard interior come with an enclosure and cover?
No. The NQ430L2 is an interior assembly only, the bussing, main lugs and breaker mounting pan. You order the box and trim separately, plus the branch breakers. The interior measures 27 inches by 10.44 inches, so match it to a box sized for that interior.
2) Which circuit breakers fit the Square D NQ 225A main lugs interior?
The NQ interior takes QO(VH) plug-in and QOB(VH) bolt-on breakers, and also accepts QOB-VH, QHB and QOB bolt-on types. If your facility is already standardized on QO/QOB branch breakers, the existing stock carries over.
3) Can I feed the Square D NQ430L2 from the bottom instead of the top?
Yes. The interior is field convertible to top or bottom feed, so you are not locked into the conduit entry at order time. That matters on a retrofit where the existing feeder comes up from below.
4) What size feeder conductors will the main lugs on this 225A NQ interior accept?
Line and neutral lugs take AWG 6 through 350 kcmil aluminum conductors. Tightening torque is 11.3 N.m, dropping to 4.52 to 5.65 N.m on the AWG 6 through 2/0 range (13.30 to 67.43 mm2). Use a torque wrench on these, not feel.
5) Main lugs or main breaker: which NQ interior do I need?
The NQ430L2 is a main lugs only interior, meaning there is no overcurrent device on the incoming feeder inside the panel. Use it where upstream protection already exists, typically a 225A or smaller feeder breaker in the switchboard or distribution panel ahead of it. If the panel needs its own disconnect or the feeder is not protected at the source, specify a main breaker interior instead.
6) What is the short circuit interrupting rating of the NQ430L2?
Interrupting current is 22 kA, 65 kA or 10 kA depending on which breaker type you install, so the branch breaker selection sets the available fault current the panel can handle. If your fault study calls for 65 kA, you need the breaker class that supports it, not just the interior.
7) Can I use the Square D NQ430L2 interior on a 480Y/277V three-phase system?
No. The NQ430L2 interior carries a 240V rating and is intended for 240VAC three-phase four-wire distribution. For a 480Y/277V three-phase system, use an interior rated for that voltage class instead, such as the Eaton Pow-R-Xpress PRL2X unassembled interior panelboard, which is specified for three-phase 480Y/277V.
8) What is the Eaton equivalent of the Square D NQ430L2 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 front are ordered separately in either case. The Square D NQ430L2 interior is a fixed configuration rated 225A at 240V with 30 pole spaces and an aluminum bus, while the Eaton PRL1X is sold as a configurable interior that is built up to the circuit layout you specify.
9) How many breakers can I actually install in a 30-space NQ interior?
30 pole spaces. That is thirty single-pole branch breakers, or fewer if you use two- and three-pole devices, a three-pole breaker eats three spaces. Count your three-phase loads before assuming 30 circuits.
10) Aluminum bus versus copper bus on an NQ panelboard interior, does it matter?
The NQ430L2 is built with an aluminum bus. It carries the same 225A rating; copper bus versions of the NQ exist as a separate catalog number and are usually specified when the engineer's drawing calls out copper bussing explicitly. If the spec sheet says copper bus, this interior will not satisfy it.
11) Is this Square D NQ interior UL listed for a commercial inspection?
Yes, the NQ interior is UL Listed and CSA Certified. The listing covers UL and CSA standards, which is what an AHJ will look for on a commercial or industrial installation.
12) What are my options if the NQ 225A interior does not fit the project?
For a configurable interior from another manufacturer, ZenSupply carries the Eaton Pow-R-Xpress PRL1X series configurable interior panelboard, and the PRL2X unassembled interior for three-phase 480Y/277V systems. The PRL2X is the one to look at when the system voltage is above the NQ's 240V rating.
13) What is the difference between a fixed interior like the Square D NQ430L2 and an unassembled interior like the Eaton PRL2X?
The NQ430L2 ships as a ready-to-install interior assembly in one defined configuration: main lugs, 225A, 30 pole spaces, aluminum bus, field convertible to top or bottom feed. The Eaton Pow-R-Xpress PRL2X is sold as an unassembled interior, meaning the branch arrangement is put together as part of the order rather than arriving in a single pre-set layout. If you want a known 30-space 225A main lugs layout to drop in, the NQ interior is the fixed-configuration choice.
How fast can I get the Square D NQ430L2 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 NQ430L2 come with a warranty?
Absolutely. The Square D NQ430L2 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 NQ430L2?
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
Why buy the Square D NQ430L2 from ZenSupply?
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