Square D NF-418L1 Panelboard I...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,214.64
Square D NF-418L1 Panelboard Interior, Main Lug, Aluminum Bus

Square D NF-418L1 Panelboard Interior, Main Lug, Aluminum Bus

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Model: NF418L1

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

$1,214.64
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Square D NF-418L1 Panelboard Interior, Main Lug, Aluminum Bus

The Square D NF-418L1 Panelboard Interior is a versatile main lugs (MLO) interior assembly built with an aluminum bus for commercial and industrial power distribution. Configured for 3-phase, 4-wire systems with a 600Y/347VAC maximum operational voltage (Ue) and a 65 kA rated interrupted current (Iu), this ready-to-install interior accepts a wide range of bolt-on branch circuit breakers and is offered across Motor FLA ratings from 125A to 250A to match branch-circuit protection needs. NF Panelboard interiors are suited for commercial buildings, industrial facilities, data centers, stadiums, and offices, and this configuration provides 18 pole spaces.

Key Features

  • Motor FLA Range: Available in 125A and 250A ratings to suit varying branch-circuit protection requirements.
  • Pole Spaces: 18 pole spaces for bolt-on branch circuit breaker capacity.
  • Durable Construction: Aluminum bus construction for reliable current-carrying capacity.
  • Main Lugs (MLO): Ready-to-install interior assembly with main lugs only, field convertible to top or bottom feed.
  • Breaker Compatibility: Accepts bolt-on EDB, EGB, and EJB miniature circuit breakers.
  • Phase Configuration: 3 phase, 4 wire distribution.
  • Rated Operational Voltage: 600Y/347 V AC (Ue) maximum.
  • Rated Interrupted Current: 65 kA (Iu).
  • Connections/Terminals: Lug neutral (AWG 6...AWG 2/0 aluminum) and lug line (AWG 6...AWG 2/0 aluminum/copper), with tightening torque of 11.3 N.m for AWG 6...AWG 2/0 conductors.
  • Enclosure Dimensions: Nominal height of 38 in or 26 in and nominal width of 20 in, depending on configuration.

Certifications & Compliance

  • UL 67 Listed
  • CSA C22.2 Certified
  • RoHS EU In Scope, Exemption Information Applies
  • REACH: Free of Substances of Very High Concern Above the Threshold
  • Mercury Free and Toxic Heavy Metal Free

Technical Specifications

  • Configuration: Main Lug (MLO)
  • Warranty Period: 18 months
  • Enclosure Nominal Width: 20 in

Typical Applications

  • Commercial Buildings
  • Industrial Buildings
  • Data Centers
  • Stadiums
  • Offices

Why Square D?

Square D NF Panelboard interiors combine an aluminum bus, UL 67 and CSA C22.2 listings, and a bolt-on branch circuit breaker design to deliver dependable, code-compliant power distribution for demanding commercial and industrial environments. With a ready-to-install main lugs assembly, field-convertible feed configuration, Motor FLA ratings spanning 125A to 250A, and an 18-month warranty, this interior is built to simplify installation while supporting long-term electrical system reliability.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Interior
Configuration:
Main Lug (MLO)
Voltage Rating:
600Y/347VAC
Standards:
CSA C22.2
Product Material:
Aluminum
Department:
Electrical
Product Group:
Wiring Devices
Amperage Rating:
65kA
Listing:
UL Listed
Product Subgroup:
Panelboards & Load Centers

Square D NF418L1 – Frequently Asked Questions

1) Will the Square D NF panelboard interior work on a 600Y/347V 3-phase 4-wire system?
Yes. The NF interior is rated 600Y/347VAC maximum operational voltage and is configured for 3-phase, 4-wire distribution, which is the standard service for 347V lighting and 600V commercial loads. Short circuit rating is 65 kA. It is UL 67 Listed and CSA C22.2 certified.
2) Which circuit breakers fit the Square D NF panelboard interior?
It takes bolt-on miniature circuit breakers from the EDB, EGB, and EJB families. Plug-on residential style breakers will not mount; the NF bus is drilled for bolt-on branch breakers only.
3) What is the difference between the NF418L1 and NF442L2 interiors?
Both are main lug NF interiors, and they differ in ampacity: NF418L1 is the 125A configuration and NF442L2 is the 250A. Pick by the feeder and main device ahead of the panel.
4) What conductor sizes and torque do the NF main lugs take?
Line lugs accept AWG 6 through 2/0 aluminum or copper, and the neutral lug accepts AWG 6 through 2/0 aluminum. Tighten AWG 6 to 2/0 conductors to 11.3 N.m.
5) Is the Eaton Pow-R-Xpress PRL1X a substitute for a Square D NF main lug panelboard interior?
They serve the same role but are not interchangeable parts. The Eaton Pow-R-Xpress PRL1X is a configurable interior panelboard from Eaton's PRL1X series. The Square D NF interior is a main lugs (MLO) assembly with an aluminum bus, 3-phase 4-wire, rated 600Y/347VAC maximum and 65 kA, and it accepts bolt-on EDB, EGB, and EJB miniature circuit breakers. Breaker mounting, bus stabs, and box sizing are manufacturer-specific, so an Eaton interior will not drop into a Square D NF box or take Square D bolt-on branch breakers. Match the interior to the enclosure and breaker line already on the job.
6) Can the NF interior be fed from the top or the bottom?
Either. The main lugs assembly is field convertible to top or bottom feed, so one interior covers both riser conditions without ordering a different part.
7) How many circuits does this Square D NF interior hold, and what box does it need?
This configuration provides 18 pole spaces for bolt-on branch breakers. Enclosure nominal width is 20 in, with nominal height of 38 in or 26 in depending on configuration. The interior ships as an assembly, so you still need the box and trim to complete the panel.
8) Is the NF panelboard bus aluminum or copper?
Aluminum bus. If the specification on the job calls for copper bus, this interior will not meet it, so check the panel schedule before ordering.
9) What else could I use instead of a Square D NF interior for a 3-phase panelboard?
The Eaton Pow-R-Xpress PRL1X Series configurable interior panelboard is the other configurable interior we carry of this type. Note that breakers are not interchangeable between the two lines, so switching brands means switching branch breakers as well.
10) Is a 65 kA interrupting rating enough for my service?
The NF interior carries a 65 kA rated interrupted current (Iu). Compare that against the available fault current calculated at the panel location; if the study shows more than 65 kA available, you need a higher rated assembly or upstream current limiting.
11) I need a main breaker panel interior - will this Square D NF work?
No. The Square D NF interior is a main lugs only (MLO) configuration, meaning the feeder lands on lugs with no integral main overcurrent device, so upstream protection has to come from the feeder breaker. If the drawing calls for a main circuit breaker interior, specify an MCB version of the NF instead. The lugs accept AWG 6 to 2/0 aluminum or copper on the line side and AWG 6 to 2/0 aluminum on the neutral, torqued to 11.3 N.m.
12) When would I choose a Square D NF interior over a configurable Eaton panelboard interior?
Choose the Square D NF main lug interior when the system is 600Y/347VAC 3-phase 4-wire and the branch breakers are Square D bolt-on EDB, EGB, or EJB types, which is common on 347V lighting distribution in commercial buildings, data centers, and stadiums. It ships as a ready-to-install main lugs assembly, field convertible to top or bottom feed, UL 67 listed and CSA C22.2 certified. The Eaton Pow-R-Xpress PRL1X is a configurable interior panelboard, so it is the path when the facility is standardized on Eaton gear and breakers.
13) Does the 125A version differ from the 250A version other than rating?
The Square D NF main lug interior is offered as NF418L1 and NF442L2, differing in ampacity and pole capacity. Both share the aluminum bus, 3-phase 4-wire arrangement, 600Y/347VAC maximum, 65 kA rating, and bolt-on EDB, EGB, and EJB breaker compatibility. Enclosure nominal height runs 38 in or 26 in with a 20 in nominal width depending on configuration, so confirm the box height against the interior you order.
How fast can I get the Square D NF418L1 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 NF418L1 come with a warranty?
Absolutely. The Square D NF418L1 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 NF418L1?
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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