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Square D NF Sub-Feed Breaker Kit, L-Frame Panelboard Accessory
Model: SQU-N600MPPL
Square D NF Sub-Feed Breaker Kit, L-Frame Panelboard AccessoryThe Square D NF Sub-Feed Breaker Kit is a field-installable panelboard accessory engineered for NQ and NF panelboards rated 400A-600A...
Square D
$1,090.77
Square D NF Sub-Feed Lug Kit, Aluminum
The Square D NF Sub-Feed Lug Kit is a factory-engineered accessory for NQ and NF panelboards, providing a modular sub-feed lug connection point for field-installed conductors. This kit is offered across sub-feed configurations spanning 125A to 400A, letting contractors and OEMs match the lug kit to the panelboard's sub-feed rating on the job. The aluminum lug construction is built for AWG 6...350 kcmil (13.3-177.3 mm²) conductors at a tightening torque of 6.8-7.3 N.m, and every configuration is cULus listed for commercial electrical installations. NQ and NF panelboards feature modular construction that accepts field-installable accessories and conversion kits, and this lug kit is built to extend that flexibility across the full 125A-400A range.
Key Features
- Sub-Feed Rating Range: Available for sub-feed configurations from 125A to 400A, matching NQ/NF panelboard capacity needs.
- Conductor Range: Designed for AWG 6...350 kcmil (13.3-177.3 mm²) conductors, expanding NQ/NF panelboard sub-feed capability.
- Durable Construction: Aluminum lug construction for reliable, corrosion-resistant conductor termination.
- Provided Equipment: Kit includes 4 lugs and 1 screw set for a complete, ready-to-install package.
- Tightening Torque: Rated 6.8-7.3 N.m across the full conductor range to ensure a secure, code-compliant connection.
- Modular Compatibility: Field-installable in NQ and NF panelboards, which feature modular construction for accessories and conversion kits.
- Design Flexibility: Factory-assembled options and ready-to-assemble kits and accessories allow on-site design changes and maximize job productivity.
- Broad Enclosure Compatibility: Compatible with a range of NQ/NF panelboard box and enclosure part numbers for use across multiple installations.
Certifications & Compliance
- cULus Listed
Technical Specifications
- Motor FLA Options: 125A, 250A, 400A
- Warranty: 18 months
- Warranty Period: 18 months
- Country of Origin: Mexico
- Toxic Heavy Metal Free: Yes
- Mercury Free: Yes
- Packaging: 1 ea
Typical Applications
- Sub-Feed Connections in NQ and NF Panelboards
- Commercial and Industrial Electrical Distribution
- Panelboard Accessory Upgrades and Conversions
- Field Modification of Existing Panelboard Installations
- Renovation and New Construction Panelboard Projects
Why Square D?
Square D backs the NF Sub-Feed Lug Kit with a full complement of lugs and hardware, precise tightening torque specifications, and cULus listing across the 125A-400A range, so contractors and OEMs get a code-compliant, reliable connection every time. As part of the NQ and NF panelboard family, this kit reflects Square D's modular design philosophy, giving electrical professionals and original equipment manufacturers the flexibility to expand or modify panelboard sub-feed capacity without sacrificing quality or safety. With a wide selection of accessories and replacement parts available for NQ and NF panelboards, Square D makes it easy to extend the life and functionality of an existing installation.
Manufacturer Resources
Product Specs
- Product Type:
- Sub-Feed Lug Kit
- Listing:
- cULus
- Country of Origin:
- Mexico
- Product Material:
- Aluminum
- Department:
- Electrical
- Product Group:
- Wiring Devices
- Amperage Rating:
- 125A - 400A
- Product Subgroup:
- Terminal Blocks & Strips
Square D NF125SFL – Frequently Asked Questions
1) What conductor sizes will the Square D NF sub-feed lug kit accept?
The NF sub-feed lug kit takes AWG 6 through 350 kcmil conductors (13.3 to 177.3 mm2). That range covers most commercial sub-feed runs off an NQ or NF panelboard, and the lugs are aluminum bodied, so they land both copper and aluminum conductors sized within that window.
2) Will the Square D sub-feed lug kit fit my existing panelboard, or does it only work on new gear?
It is field installable in NQ and NF panelboards. Those panelboards use modular construction that accepts accessories and conversion kits after the fact, so you can add sub-feed capability to an already installed panel rather than replacing it. It is not a universal lug kit, though. If the panel in front of you is not an NQ or NF, this is the wrong part.
3) Which amp rating of the NF sub-feed lug kit do I order?
Three ratings are offered: 125 A (NF125SFL), 250 A (NF250SFL) and 400 A (NF400SFL). Match the kit to the sub-feed ampacity you are tapping in the panelboard, not to the branch breaker sizes. Each is ordered as a single kit.
4) What is in the box, and do I need extra hardware to land the sub-feed?
Each kit ships with 4 lugs and 1 screw set, which is a full set of terminations for a three phase plus neutral or ground sub-feed. No separate mounting hardware order is needed for the lugs themselves. Conductors, conduit and any wire management are on you.
5) What torque do I tighten the Square D NF sub-feed lugs to?
6.8 to 7.3 N.m, and that figure holds across the entire AWG 6 to 350 kcmil range, so you do not have to look up a different value per conductor size. Use a torque tool, not feel, since aluminum terminations are the ones inspectors check.
6) Is this Square D lug kit listed for commercial electrical work?
The NF sub-feed lug kit is cULus listed, which covers both US and Canadian installs, and it is a factory engineered Square D accessory rather than a generic aftermarket lug. That matters on inspected commercial and industrial distribution work where a field added lug has to be an approved part for the panelboard.
7) What is a sub-feed lug kit actually for in a panelboard?
It gives you a second set of lugs on the panelboard bus so you can feed a downstream panel without burning a breaker space or installing a separate tap box. Typical uses are sub-feed connections in NQ and NF panelboards, accessory upgrades and conversions on existing gear, and field modifications during renovation or new construction. If you instead need overcurrent protection on that downstream feed, a sub-feed breaker is the right choice, not a lug kit.
8) Are the Square D NF sub-feed lugs aluminum or copper?
Aluminum bodied. Aluminum resists corrosion at the termination and is the standard body material for panelboard sub-feed lugs. Whatever conductor you land, keep it inside the AWG 6 to 350 kcmil range and torque to 6.8 to 7.3 N.m.
9) Where is the Square D NF sub-feed lug kit made?
Mexico. For agencies and institutional buyers tracking material content, the kit is also declared free of toxic heavy metals and mercury.
How fast can I get the Square D NF125SFL 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 NF125SFL come with a warranty?
Absolutely. The Square D NF125SFL 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 NF125SFL?
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