Square D NF Panelboard Sub-Fee...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,083.60
Square D NF Panelboard Sub-Feed Breaker Kit, 600A, H-Frame

Square D NF Panelboard Sub-Feed Breaker Kit, 600A, H-Frame

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Model: NF600SFBH

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

$1,083.60
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Square D NF Panelboard Sub-Feed Breaker Kit, 600A, H-Frame

The Square D NF Panelboard Sub-Feed Breaker Kit is a field-installable accessory designed for NQ and NF panelboards built on the H-Frame platform. Rated for 600A sub-feed applications, this kit lets contractors and OEMs add sub-feed breaker capability to modular NF panelboards without replacing the entire enclosure. The kit is cULus Listed and ships complete with the hardware needed for a proper factory-matched installation.

Key Features

  • Amperage Rating: Engineered for 600A sub-feed breaker capacity on H-Frame NF panelboards.
  • H-Frame Configuration: Matched to the H-Frame platform for correct fit and reliable electrical connection.
  • Complete Hardware Set: Includes 1 screw set, 6 cables, 2 rail splices, 1 closing plate, 2 support brackets, 2 rail extensions, 1 mounting plate, 5 lugs, and 1 cover plate for a full installation.
  • Modular Construction: NQ and NF panelboards accept field-installable accessories and conversion kits, making it easy to modify or extend panelboard use.
  • Design Flexibility: Factory-assembled options maximize job productivity and allow design flexibility on the jobsite.
  • Broad Accessory Selection: Part of Square D's wide selection of NQ and NF panelboard accessories and replacement parts.

Certifications & Compliance

  • cULus Listed
  • RoHS EU Compliant
  • Mercury Free
  • Toxic Heavy Metal Free

Technical Specifications

  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • ROHS Eur In Scope: Yes
  • Warranty: 18 months
  • Warranty Period: 18 months
  • Country of Origin: Mexico
  • Market Segmentation: Commercial
  • Recycled Metal Content At Cr Level: 0 %
  • Sustainable Packaging: No
  • Packaging Without Single Use Plastic: No
  • Packaging Made With Recycled Cardboard: No
  • WEEE Product Category: 5
  • China ROHS In Scope: No

Typical Applications

  • Commercial and Industrial Panelboard Installations
  • Adding Sub-Feed Breaker Capacity to Existing NF Panelboards
  • Panelboard Modification and Retrofit Projects
  • New Construction Electrical Distribution
  • Field Upgrades to H-Frame Panelboard Systems

Why Square D?

Square D by Schneider Electric engineers its NQ and NF panelboard accessories for modular, factory-matched compatibility, so kits like this 600A H-Frame sub-feed breaker kit install cleanly and perform reliably. With cULus Listing, Mercury Free and Toxic Heavy Metal Free construction, and an 18-month warranty, this kit gives contractors and OEMs a code-compliant way to extend panelboard functionality without a full replacement.

Manufacturer Resources

Product Specs

Product Type:
Main/Sub-Feed Breaker Kit
Amperage Rating:
600A
Configuration:
H-Frame
Series:
NF
Listing:
cULus
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers

Square D NF600SFBH – Frequently Asked Questions

1) Will the Square D NF600SFBH sub-feed breaker kit fit any NF panelboard, or only H-Frame?
H-Frame only. The NF600SFBH is matched to the H-Frame platform in NQ and NF panelboards, and the rails, splices, and mounting plate in the kit are cut for that interior. On a panelboard built on a different frame platform the hardware will not line up, so confirm the existing interior is H-Frame before ordering.
2) What is actually in the Square D 600A sub-feed breaker kit, and do I need to order anything else to install it?
The kit ships with 1 screw set, 6 cables, 2 rail splices, 1 closing plate, 2 support brackets, 2 rail extensions, 1 mounting plate, 5 lugs, and 1 cover plate. That covers the mechanical and connection hardware for the conversion. The sub-feed circuit breaker itself is a separate item, so specify the 600A H-frame breaker you intend to land in the panel along with the kit.
3) Can I add sub-feed capacity to an existing NF panelboard without replacing the enclosure?
That is exactly what this kit is for. The NF600SFBH is field-installable, so a contractor can add 600A sub-feed breaker capability to a modular NF panelboard already in place instead of swapping out the whole enclosure. NQ and NF interiors are built to accept field-installed accessories and conversion kits, which is what makes the retrofit practical in an occupied building.
4) What is the Eaton equivalent of the Square D NF600SFBH sub-feed breaker kit?
The closest cross-brand counterpart is the Eaton Pow-R-Xpress Convertible Main Breaker Kit (BKD2F), which is also a field-installable panelboard breaker kit rather than a breaker itself. The difference is the role: the Square D NF600SFBH is a sub-feed breaker kit for NQ and NF panelboards on the H-Frame platform, rated 600A, while the Eaton kit is a convertible main breaker kit for the Pow-R-Xpress line. Panelboard breaker kits are platform-specific, so the Eaton kit mounts in Eaton Pow-R-Xpress gear and the NF600SFBH mounts in Square D H-Frame NQ/NF interiors; they are not interchangeable in the same enclosure.
5) I need to add a main breaker, not a sub-feed. Is the NF600SFBH the wrong kit?
Yes. The Square D NF600SFBH is a sub-feed breaker kit, which taps the panelboard bus to feed a downstream panel and is used to extend distribution from an existing H-Frame NQ or NF interior. A main breaker kit instead converts a main-lug interior to main-breaker service entrance protection. Eaton's Pow-R-Xpress Convertible Main Breaker Kit is an example of that second type. If the drawing calls for a main device, a sub-feed kit will not satisfy it even at the same amperage.
6) My panelboard is an Eaton Pow-R-Xpress. Can I use the Square D NF600SFBH in it?
No. The NF600SFBH is matched to the Square D H-Frame platform and ships with rail splices, rail extensions, support brackets, a mounting plate, lugs, and cover and closing plates sized to Square D NQ and NF interiors. For Eaton Pow-R-Xpress gear, the kit from that line is the Pow-R-Xpress Convertible Main Breaker Kit. Breaker kits are not cross-brand items; the bus stabs, rail geometry, and enclosure cutouts differ.
7) Is the Square D NF sub-feed breaker kit UL Listed for use in a commercial building?
The NF600SFBH carries a cULus Listing, which covers it for both US and Canadian installations. It is also RoHS EU compliant, mercury free, and free of toxic heavy metals, which matters on institutional and government jobs with material restrictions in the spec. Square D positions it for commercial market use.
8) What is the difference between a sub-feed breaker kit and a main breaker conversion kit for a panelboard?
A sub-feed kit like the Square D NF600SFBH taps the panelboard bus ahead of the branch circuits to feed a downstream panel or large load, so you get a second feeder out of the same enclosure. A main breaker conversion kit instead converts a main-lug interior into a main-breaker interior, giving the panel its own disconnect and overcurrent device; the Eaton Pow-R-Xpress convertible main breaker kit is that second category. If the goal is a disconnecting means for the panel itself, a sub-feed kit is the wrong part.
9) Does the 600A rating on the NF600SFBH limit the breaker I can install in it?
Yes. The kit is engineered for 600A sub-feed breaker capacity on H-Frame NF panelboards, so the lugs, cables, and mounting plate supplied are sized for that duty. Don't plan on landing a larger-frame device in it, and make sure the panelboard bus rating and the upstream feeder support the sub-feed you are adding.
10) Is it simpler to replace the whole panelboard instead of adding a sub-feed kit?
The NF600SFBH exists specifically to avoid that. Because NQ and NF panelboards accept field-installable accessories and conversion kits, the 600A H-Frame sub-feed kit adds sub-feed breaker capability to an existing interior without replacing the enclosure, and it is cULus Listed as supplied. The comparable approach on Eaton equipment is the Pow-R-Xpress Convertible Main Breaker Kit, which likewise converts an existing interior in the field rather than requiring new gear.
11) How do I order the right Square D NF sub-feed kit, and where is it made?
Order by catalog number NF600SFBH for the 600A H-Frame version; that single part number covers the complete kit. It is manufactured in Mexico, which is worth noting if your project carries country-of-origin reporting requirements.
How fast can I get the Square D NF600SFBH 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 NF600SFBH come with a warranty?
Absolutely. The Square D NF600SFBH 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 NF600SFBH?
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 NF600SFBH from ZenSupply?
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