Square D I-Line Subfeed Lug Ki...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4,490.47
Square D I-Line Subfeed Lug Kit

Square D I-Line Subfeed Lug Kit

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Model: SQUSL250

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

$4,490.47
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Square D I-Line Subfeed Lug Kit Panelboard Accessory

The Square D I-Line Subfeed Lug Kit is a connection accessory engineered for I-Line panelboards. This plug-on subfeed lug kit is designed for PowerPact L-Frame, LA-LH circuit breakers and carries a 400 amp amperage rating with a 400 amp frame size. The lug accepts (1) 1-600 kcmil conductor, giving electricians flexible wire-sizing options when adding subfeed capacity to an I-Line panelboard. The kit is UL Listed and CSA certified for code-compliant commercial and industrial power distribution.

Key Features

  • Amperage Rating: 400 amp rating with a 400 amp frame size for PowerPact L-Frame, LA-LH circuit breakers.
  • Connection Type: Plug-on subfeed lug kit for straightforward installation into compatible I-Line panelboards.
  • Conductor Capacity: Lug accepts (1) 1-600 kcmil conductor for flexible wire termination.
  • Product Range: Part of the Square D I-Line panelboard accessory range.
  • Country of Origin: Manufactured in Mexico.
  • Packaging: Supplied 1 each.

Certifications & Compliance

  • UL Listed
  • CSA Certified

Technical Specifications

  • Warranty: 18 months
  • Take Back: No
  • Tier: 1
  • Returnability: Yes
  • Warranty Period: 18 months
  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: No
  • Tier Id: 1
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Legacy WEEE Scope: In
  • Packaging Made With Recycled Cardboard: Yes
  • Serviceability: No
  • With Recycled Cardboard: Yes
  • WEEE Product Category: 4
  • Without Single Use Plastic: No
  • ROHS Exemption Information: Yes
  • Traceability: No
  • Relationshiptype: Compatible relationship
  • Product Or Component Type: sub-feed lug

Typical Applications

  • Commercial and Industrial Panelboard Installations
  • I-Line Panelboard Subfeed Connections
  • PowerPact L-Frame and LA-LH Circuit Breaker Systems
  • Panel Building and OEM Control Panel Applications
  • New Construction and Panelboard Retrofit Projects

Why Square D?

Square D I-Line accessories pair UL Listed and CSA certified construction with dependable connection performance for panelboard power distribution. This subfeed lug kit is built to the I-Line range's engineering standards, delivering flexible, code-compliant termination for 1-600 kcmil conductors in demanding commercial and industrial applications.

[{"name": "Product Type", "value": "Subfeed Lug Kit"}, {"name": "Series", "value": "I-Line"}, {"name": "Amperage Rating", "value": "400A"}, {"name": "Listing", "value": "UL Listed"}, {"name": "Standards", "value": "CSA"}, {"name": "Country of Origin", "value": "Mexico"}]

Manufacturer Resources

Product Specs

Product Group:
Wire Connectors & Terminals
Department:
Electrical
Product Type:
Equipment Lug Kit
Product Subgroup:
Lugs & Terminals

Square D SQUSL250 – Frequently Asked Questions

1) What conductor size does the Square D I-Line subfeed lug kit accept?
The lug on the Square D I-Line subfeed lug kit takes one conductor from 1 AWG up to 600 kcmil, so a single large feeder lands directly without a splice or reducer. That range covers most 250A and 400A subfeed runs in a commercial panel.
2) Which circuit breakers is the Square D SL400 subfeed lug kit built for?
It is made for PowerPact L-Frame, LA-LH circuit breakers in an I-Line panelboard, with a 400 amp rating matched to a 400 amp frame size. If your breaker frame is something other than an L-Frame, this is not the lug kit for that position.
3) Is the Square D I-Line subfeed lug kit available in anything smaller than 400A?
Two amperages are offered: 400A (MPN SL400) and 250A (MPN SL250). Pick the one that matches the breaker frame size you are feeding, not just the load current.
4) Does installing this Square D subfeed lug kit require bus drilling or a panel modification?
No. It is a plug-on subfeed lug kit, so it mounts onto the I-Line bus the same way a plug-on branch breaker does. No field drilling of the bus is involved, which is why it works on retrofit jobs as well as new panel builds.
5) Can I use this Square D lug kit in an ABB or Eaton panel?
No. The kit is engineered as an I-Line panelboard accessory for Square D PowerPact L-Frame breakers, and it plugs onto the I-Line bus. For other gear you need that manufacturer's own kit, for example the Eaton Series C line and load terminal accessory kit for Eaton Series C breakers, or the ABB OT/OS400 Series replacement disconnect switch lug kit for ABB OT/OS400 switches.
6) What is the ABB equivalent of a Square D SL400 subfeed lug kit?
The closest ABB counterpart is the MLA A-Series main lug kit, which uses pressure-type lugs and covers a 400A to 600A range. The difference is where each one lands in the enclosure: the Square D SL400 is a plug-on subfeed lug kit for I-Line panelboards, used with PowerPact L-Frame LA-LH breakers, accepting (1) 1-600 kcmil conductor. The ABB MLA is a main lug kit on ABB's A-Series equipment, so it terminates the incoming main feed rather than plugging on to add a subfeed tap. Check which position the drawing calls for before cross-referencing.
7) Can I use an ABB TLK2 or TNLK2 lug kit instead of a Square D subfeed lug kit?
No - those serve a different conductor. The ABB TLK2 PowerMark Gold kit is a neutral/ground lug kit for CU/AL conductors, and the TNLK2 is a neutral lug kit for CU/AL conductors; both land grounded and bonding conductors in PowerMark Gold load centers. The Square D I-Line subfeed lug kit is a phase-side plug-on connection that adds subfeed capacity in an I-Line panelboard and accepts (1) 1-600 kcmil conductor. If you need a bonded neutral or ground bar, the ABB kits are the right family; if you are tapping a feeder through, they are not substitutes.
8) My 400A feeder is terminating at a disconnect switch, not a panelboard - what lug kit should I use?
For a switch body, look at the ABB OZXA-400, a replacement disconnect switch lug kit for the OT/OS400 series. The Square D I-Line subfeed lug kit is built to plug on inside an I-Line panelboard behind PowerPact L-Frame LA-LH breakers, so it has nothing to mount to in a fused or non-fused disconnect. Match the lug kit to the device family the conductor is actually landing in.
9) Is this subfeed lug kit UL Listed and CSA certified for a commercial inspection?
Both. The Square D I-Line subfeed lug kit is UL Listed and CSA Certified, which is what inspectors look for on commercial and industrial power distribution work in the US and Canada.
10) What is the difference between a main lug kit and a subfeed lug kit?
A subfeed lug kit, like this Square D I-Line unit, plugs onto the bus in a breaker position so you can carry power out of the panel to a downstream panel while the panel keeps its own main. A main lug kit terminates the incoming service at the top of the bus instead. The ABB MLA A-Series Main Lug Kit with pressure-type lugs, rated 400A to 600A, is an example of the main-lug type for ABB A-Series gear. They are not interchangeable, and neither crosses between Square D I-Line and ABB enclosures.
11) Can this be used as a neutral or ground lug kit?
No. It is a sub-feed lug, intended for phase feeder termination off the I-Line bus. Neutral and ground bonding needs a dedicated neutral or ground lug kit for your panel line, such as the ABB TLK2 Series PowerMark Gold neutral/ground lug kit or the TNLK2 Series neutral lug kit, both rated for CU/AL conductors in ABB PowerMark Gold panels.
12) Is the Eaton 3T20FB terminal kit interchangeable with the Square D SL250 or SL400 lug kit?
They are not interchangeable. The Eaton 3T20FB is a Series C line and load terminal accessory kit, intended for Eaton Series C breakers, where it terminates conductors directly at the breaker's line and load ends. The Square D kit is offered in 250A and 400A versions and is a plug-on subfeed lug assembly that mounts into an I-Line panelboard interior to carry a feeder through. Terminal kits and subfeed lug kits are both lug hardware, but each is cut for its own breaker and bus system.
13) I need aluminum conductors - does the Square D I-Line subfeed lug kit or an ABB kit handle CU/AL?
ABB's PowerMark Gold TLK2 and TNLK2 kits are specified for CU/AL conductors, but they are neutral and ground lug kits. On the Square D side, the I-Line subfeed lug kit is rated to accept (1) 1-600 kcmil conductor per lug and is UL Listed and CSA certified for commercial and industrial distribution; confirm the conductor material marking on the lug body against your feeder before pulling.
14) How many lug kits come in a pack, and where is the Square D SL400 made?
Each order is supplied 1 each, so a three-phase position needing multiple terminations means ordering accordingly. The kit is manufactured in Mexico.
How fast can I get the Square D SQUSL250 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 SQUSL250 come with a warranty?
Absolutely. The Square D SQUSL250 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 SQUSL250?
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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