NSi Industries Aluminum Dual-R...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$12.57
NSi Industries Aluminum Dual-Rated Set-Screw Lug

NSi Industries Aluminum Dual-Rated Set-Screw Lug

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Model: 300T

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

$12.57
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NSi Industries Aluminum Dual-Rated Set-Screw Lug

The NSi Industries Aluminum Dual-Rated Set-Screw Lug is a single-port mechanical termination lug built for both copper and aluminum conductors, spanning a 300 MCM - 6 AWG wire range. Machined from 6061T-6 aluminum alloy and electro-tin plated for low contact resistance, this reusable set-screw lug carries a 90 degrees C temperature rating and is rated 600 volts (2000V max. per UL486B). It is UL 486A/486B Listed and cULus recognized for dependable, code-compliant terminations in commercial and industrial applications.

Key Features

  • Wire Range: Accommodates 300 MCM - 6 AWG conductors for flexible sizing across job requirements.
  • Durable Construction: Machined from 6061T-6 aluminum alloy for strength and long-term corrosion resistance.
  • Reusable Set-Screw Connector: Versatile, reusable set-screw design simplifies field termination and re-termination.
  • Dual-Rated Design: Suitable for use with both copper and aluminum conductors.
  • Temperature Rating: Rated 90 degrees C for demanding electrical environments.
  • Voltage Rating: Rated 600 volts (2000V max. per UL486B) for safe, reliable performance.
  • Finish: Electro-tin plated for consistently low contact resistance.
  • Bolt Size: 5/16" bolt size for a secure mechanical connection.

Certifications & Compliance

  • UL Listed
  • cULus
  • UL 486A/486B Listed

Technical Specifications

  • INNER WIDTH: 6.2
  • INNER LENGTH: 8.8
  • INNER HEIGHT: 3.1
  • WARRANTY: 1 Year
  • Product Series: T
  • Environmental Temperature: 90C

Typical Applications

  • Commercial and Industrial Electrical Installations
  • Panelboard and Switchgear Terminations
  • Copper-to-Aluminum Conductor Transitions
  • Service Entrance and Feeder Connections
  • Renovation and New Construction Wiring

Why NSi Industries?

NSi Industries builds this lug from 6061T-6 aluminum alloy with an electro-tin plate finish and backs it with UL 486A/486B Listing and cULus recognition, giving electrical professionals a dependable, code-compliant mechanical termination for demanding 600-volt, 90 degrees C copper and aluminum conductor applications.

Manufacturer Resources

Product Specs

Wire Size:
300 MCM - 6 AWG
Tang Length:
1 IN
Tang Width:
0.88 IN
Sub Division:
Electrical-E H2
Division:
Electrical H1
Tang Thickness:
0.25 IN
Max Temperature:
90 C
Warranty:
1 Year
Series:
T
Field Application:
Terminate
Voltage Rating:
600V
Hex Wrench Size:
16-May IN
Country Of Origin:
United States
Conductor Type:
Copper, Aluminum
Product Material:
6061T-6 Aluminum Alloy
Mounting Hole Position:
0.5 IN
Product Finish:
Tin Plated
Environmental Temperature:
90C
Product Type:
Mechanical Lug
Department:
Electrical
Product Group:
Wire Connectors & Terminals
Product Subgroup:
Lugs & Terminals

NSi 300T – Frequently Asked Questions

1) Can the NSi 300T lug be used on aluminum conductors, or copper only?
Both. The 300T is dual-rated for copper and aluminum conductors, which is what makes it usable for copper-to-aluminum transitions at a panel or gutter. The body is 6061T-6 aluminum alloy with an electro-tin plated finish to keep contact resistance low on either metal.
2) What wire sizes will the NSi 300T set-screw lug accept?
One conductor from 300 MCM down to 6 AWG. That single port covers feeder and service-entrance sizes as well as smaller branch conductors, so one part number handles a wide span of terminations. If you need to land more than one conductor, you need a multi-port mechanical lug instead.
3) Can the Burndy SCRULUG lug be used in place of the NSi 300T on aluminum conductors?
Not for aluminum. The Burndy P470179 SCRULUG is a copper lug, so it is intended for copper conductors only. The NSi 300T is dual-rated and lists its conductor type as copper and aluminum, which is what makes it suitable for aluminum feeders and copper-to-aluminum transitions. If the conductor landing is aluminum, stay with the dual-rated 300T.
4) Is the NSi 300T lug rated for 90 degree C conductors like THHN?
The 300T carries a 90 degree C temperature rating and is rated 600 volts (2000V max per UL 486B), so it matches 90 C insulated building wire. Ampacity still has to be derated per the NEC table and terminal rating of the equipment you are landing in.
5) What size hex wrench do I need to tighten the NSi 300T set screw?
A 5/16 inch hex key drives the set screw. It is a reusable set-screw design, so the same lug can be re-terminated if a conductor is pulled and relanded rather than cut off and replaced like a compression lug.
6) Set-screw lug or compression lug for a service entrance termination?
A set-screw mechanical lug like the NSi 300T lands with a hex key and no hydraulic tool, and it can be loosened and reused, which is why it is common on panelboard, switchgear, and service-entrance work and on renovation jobs where conductors get reworked. A compression lug needs a die and crimper and is a permanent termination. If you have no crimper on the truck or expect to re-terminate, the mechanical lug is the practical choice.
7) Do the NSi 300T and the Burndy SCRULUG mount the same way?
Both are single-hole lugs that bolt to a pad or bus. The NSi 300T has a 1 inch tang that is 0.88 inch wide and 0.25 inch thick with the mounting hole positioned 0.5 inch from the end, so check those tang dimensions against the pad spacing before swapping either direction. The Burndy P470179 SCRULUG is likewise a 1-hole lug, but confirm its tang geometry against your pad since one-hole lugs are not dimensionally interchangeable by default.
8) What is the difference between a pressure bar lug and the NSi 300T set-screw lug?
The NSi 300T terminates with a set screw, a reusable mechanical design that lets you re-terminate the same lug if a conductor is pulled or resized, and it takes a 300 MCM to 6 AWG range on a single port. The Burndy P470179 SCRULUG uses a pressure bar, which clamps the conductor across a bar face rather than under a single screw point. Both are tin-plated one-hole lugs; the choice comes down to the clamping method your spec or installer prefers.
9) If a panel is wired entirely in copper, is there a copper-specific lug instead of the NSi 300T?
Yes. The Burndy P470179 SCRULUG is a copper lug and is a reasonable choice on an all-copper installation. The NSi 300T will also land copper, since it is dual-rated for copper and aluminum, so many contractors standardize on the 300T to stock one lug for both conductor materials rather than two.
10) What is the alternative to the NSi 300T if I only need to terminate copper?
For copper-only work, the Burndy SCRULUG pressure bar lug is a one-hole tin-plated copper lug ZenSupply carries. The NSi 300T is the one to use when the conductor is aluminum or when you need the same part to handle either metal, since it is dual-rated for copper and aluminum.
11) Is the NSi 300T lug made in the USA?
Country of origin on the 300T is the United States. That matters on government, healthcare, and institutional projects carrying domestic-sourcing requirements, where the submittal has to show origin.
How fast can I get the NSi 300T 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 NSi 300T come with a warranty?
Absolutely. The NSi 300T 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 NSi 300T?
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 NSi 300T from ZenSupply?
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