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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States (US)
- Insulation Material:
- Yes
- Product Group:
- Wire & Cable Management
- Product Type:
- Multi-Port Connector
- Selling Unit Of Measure:
- each
- Standards:
- ANSI C119.1 and ANSI C119.4
- Temperature Range:
- up to 130 °C
- Type2:
- Electrical connector assembly
- Department:
- Electrical
- Product Subgroup:
- Connectors
- Product Size:
- 3.6 Inches
- Product Color:
- Black
- Product Material:
- Aluminum
Blackburn USB33S – Frequently Asked Questions
1) What wire range does the Blackburn USB33S multiport connector accept?
The USB33S takes conductors from 12 AWG up to 350 kcmil across each of its three ports, so it covers everything from small branch feeders to heavy service conductors in one block.
2) Can I use the Blackburn USB33S with aluminum conductors, or copper only?
The body is aluminum, and the connector is listed to ANSI C119.1 and C119.4, the standards that cover sealed and non-sealed connectors for aluminum and copper conductors. Treat it as a dual-rated AL/CU block and use the appropriate joint compound on aluminum runs.
3) How much room do I need in the gutter or pull box for a 3-port Blackburn multiport connector?
Plan on about 3.6 inches for the connector body itself, plus bending space for three conductors that may be as large as 350 kcmil. In a tight wireway that length plus conductor bend radius is usually the limiting factor, not the block.
4) Do I have to insulate or tape the Blackburn USB33S after I land the conductors?
No taping needed. The USB33S ships as an insulated black connector assembly, so the cover is part of the product rather than a field-applied wrap. That is the main reason contractors pick a multiport block over a bare set-screw lug in a gutter tap.
5) Is the Blackburn USB33S made in the USA for a Buy American spec job?
Country of origin on the USB33S is the United States, which is what a government or institutional procurement package typically needs documented for domestic-content requirements.
6) Is the Blackburn USB33S sold as a set or individually?
Each connector is sold singly, so a three-phase plus neutral tap means ordering four. Count one per phase conductor being tapped, not one per job.
How fast can I get the Blackburn USB33S 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 Blackburn USB33S come with a warranty?
Absolutely. The Blackburn USB33S 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 Blackburn USB33S?
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 Blackburn USB33S from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.