NSi ISR Polaris™ Insulated In-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$37.66
NSi ISR Polaris™ Insulated In-Line Splice Connector, 2-Conductor

NSi ISR Polaris™ Insulated In-Line Splice Connector, 2-Conductor

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Model: ISR-1/0

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

$37.66
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NSi ISR Polaris™ Insulated In-Line Splice Connector

The NSi Industries Polaris™ ISR Series Insulated In-Line Splice Connector is engineered for secure, code-compliant wire termination and is available across a wire range spanning from 1/0 – 14 AWG up through 500 MCM – 4 AWG, with a mid-range option covering 250 MCM – 6 AWG. Every connector in the ISR Series is built to accommodate 2 conductors of Class B & C stranding, carries a 600V voltage rating and a 90°C temperature rating, and is finished in a black Plastisol insulated sleeve for durable, pre-insulated protection. Each configuration is cULus listed, making the ISR Series suitable for demanding commercial and industrial electrical work where dependable in-line splicing and conductor reduction are required.

Key Features

  • Wire Range: Available in 1/0 – 14 AWG, 250 MCM – 6 AWG, and 500 MCM – 4 AWG options to match a broad range of conductor sizes.
  • Number Of Conductors: Designed for 2 conductors, supporting Class B & C stranded wire types across every wire-range option.
  • Voltage Rating: 600V rating supports reliable in-line splicing and reduction applications for all configurations.
  • Temperature Rating: 90°C rating for continuous performance in demanding environmental conditions.
  • Durable Construction: Black Plastisol material and finish deliver a tough, pre-insulated sleeve that resists damage during and after installation.
  • Type: In-Line Splicer/Reducer configuration allows direct in-line termination and conductor reduction without additional taping.
  • Application: Purpose-built for wire termination tasks across electrical distribution systems.

Certifications & Compliance

  • cULus Listed

Technical Specifications

  • Number Of Conductors: 2
  • Brand Name: NSi
  • Voltage Rating: 600V
  • Environmental Conditions: 90°C
  • Wire Range Options: 1/0 - 14 AWG, 250 MCM - 6 AWG, 500 MCM - 4 AWG

Typical Applications

  • Commercial and Industrial Electrical Wiring
  • Wire Splicing and Conductor Reduction
  • Panelboard and Distribution Wiring
  • Insulated In-Line Wire Termination
  • Renovation and New Construction Electrical Work

Why NSi Industries?

NSi Industries builds the Polaris™ ISR Series with a black Plastisol insulated sleeve, a 600V and 90°C rating, and cULus listing behind every insulated in-line splice connector, across every wire-range option from 1/0 – 14 AWG through 500 MCM – 4 AWG. For electricians and contractors who need a dependable 2-conductor splice solution sized to their exact application, the Polaris™ ISR Series delivers consistent, code-compliant performance for professional electrical installations.

Manufacturer Resources

Spec Sheet

Product Specs

Product Color:
Black
Number Of Conductors:
2
Temperature Rating:
90° C
Brand Name:
NSi
Voltage Rating:
600V
Application:
Wire Termination
Environmental Conditions:
90 C
Product Material:
Plastisol
Standards:
cULus
Product Finish:
Plastisol
Product Type:
Splice Connector
Wire Type:
Class B & C
Department:
Electrical
Product Group:
Wire Connectors & Terminals
Listing:
cULus
Wire Size:
500 MCM - 4 AWG
Configuration:
2-Conductor
Product Subgroup:
Splice Kits

NSi ISR-1/0 – Frequently Asked Questions

1) Can I splice a #6 AWG branch conductor to a 250 MCM feeder with the NSi Polaris ISR connector?
Yes, that is exactly what the ISR-250 covers. Its range runs 250 MCM down to 6 AWG, so a 250 MCM feeder on one side and a #6 on the other both land within the same connector. The ISR is an in-line splicer/reducer, so unequal conductor sizes are the intended use, not an exception.
2) Which NSi ISR splice connector do I order for my wire size?
Three ranges cover it. ISR-1/0 takes 1/0 through 14 AWG for smaller branch and control work. ISR-250 spans 250 MCM to 6 AWG. ISR-500 spans 500 MCM to 4 AWG for feeder and service work. Pick the one where both conductors you are joining fall inside the range, since each connector accepts 2 conductors total.
3) Do I need to tape or heat-shrink the NSi Polaris ISR splice after I tighten it?
No. The ISR ships with a black Plastisol insulated sleeve already on the body, so it is a pre-insulated splice rated 600V and 90 C as supplied. No tape wrap, no heat shrink, no separate cover to buy.
4) Is the NSi Polaris ISR connector rated for 90 degree C THHN in a 600V panelboard?
Yes. The ISR carries a 600V rating and a 90 C temperature rating, which matches 90 C insulated building wire, and it is cULus listed. That covers panelboard and distribution wiring on both sides of the border.
5) Can I use one ISR connector to join three conductors?
No. Each ISR is a 2-conductor device, one conductor per port. For a three-way or multi-tap splice you need a multi-port connector with the port count you need, not a second wire forced into an ISR port.
6) Is a Polaris ISR the right choice for medium-voltage cable?
No. The ISR tops out at 600V, so it is a low-voltage building wire splice only. For medium or high voltage work, look at a compression splice rated for it, such as the Panduit Pan-Lug SCS-6 copper compression splice connector rated 35kV.
7) Is the Panduit SCS-6 splice connector a substitute for the NSi Polaris ISR in-line splice?
They solve splices in different systems. The NSi Polaris ISR is an insulated in-line splicer/reducer rated 600V at 90 C, cULus listed, taking 2 conductors of Class B and C stranding, and it arrives pre-insulated in a black Plastisol sleeve so no taping is needed. The Panduit SCS-6 is a Pan-Lug copper compression splice rated 35kV, which is a medium-voltage class part. If the work is 600V panelboard or distribution wiring, the ISR is the matching part; a 35kV compression splice belongs to a different class of installation.
8) I need to splice a 500 MCM feeder down to a 4 AWG conductor at 600V. Which connector fits?
The NSi Polaris ISR-500 covers a 500 MCM to 4 AWG wire range and is built as a 2-conductor in-line splicer/reducer, so the reduction happens inside the connector. It carries a 600V, 90 C rating and is cULus listed. Smaller reductions are handled by the ISR-250 at 250 MCM to 6 AWG and the ISR-1/0 at 1/0 to 14 AWG. The Panduit SCS-6 Pan-Lug compression splice is a 35kV-class part and is not the match for a 600V feeder splice.
9) Will the Polaris ISR accept compact or Class B stranded conductors?
Class B and Class C stranding is what the ISR is built for, across all three wire ranges. Solid or other stranding classes are outside what NSi specifies for this connector, so for anything other than Class B or C, use a connector rated for that conductor.
10) Do I need a crimp tool or die set for the NSi ISR splice connector?
No crimper. The ISR is a set-screw style insulated splicer/reducer, tightened with a hex key or driver, which is why it works well in a panel or handhole where you cannot get a compression tool in. If your spec calls for a compression splice instead, the Panduit Pan-Lug SCS series (for example SCS-6) is a copper compression splice connector rated 35kV.
11) Do I need a crimping tool to install an NSi Polaris ISR splice, or is there a compression alternative?
The Polaris ISR is a mechanical insulated in-line splicer/reducer with a pre-insulated black Plastisol body, so the conductors are secured in the connector itself rather than crimped and then taped. If the job calls for a compression splice instead, the Panduit SCS-6 is a Pan-Lug copper compression splice, which is die-crimped onto the conductor. Choose based on which method the installation is specified for.
12) What does the black sleeve on the Polaris ISR do in a damp or rough vault installation?
The sleeve is black Plastisol, a tough pre-insulated cover that stays on the connector during and after install rather than something you wrap on site. It gives the splice its 600V, 90 C insulation rating and resists knocks while you are dressing conductors in a tight enclosure.
How fast can I get the NSi ISR-1/0 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 ISR-1/0 come with a warranty?
Absolutely. The NSi ISR-1/0 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 ISR-1/0?
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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