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Black rubber-encapsulated aluminium insulated connector, three ports, hex head

Polaris nsi

Polaris nsi ISPBS350 Insulated Connector Aluminum 350 kcmil

SKU CH-CA5C-A73K3

An insulated three-port aluminium connector accepting stranded copper from 12 AWG to 350 kcmil at 600 V

  • Product typeWire Connectors & Terminals
  • Insulated rubber encapsulation protects connections up to 194 °F
  • Three ports accept 12 AWG to 350 kcmil stranded copper or aluminium
  • Hex-head design with 5/16 in drive enables secure torque installation
  • UL 94 V-1 flammability rating and ANSI C119.4 compliance ensure code-approved safety
  • Rated 600 V for reliable performance in industrial and automotive power circuits

Three-port insulated multitap

This POLARIS connector joins up to three conductors in a single block. It accepts stranded copper from 12 AWG up to 350 kcmil and also works with aluminium conductors. The rubber-encapsulated body is rated for 600 V and carries UL 94 V-1 flammability approval. It suits panel builders and electricians needing a compact, code-compliant splice.

194 °F thermal rating and V-1 flammability

The connector operates continuously up to 194 degrees Fahrenheit without degradation. Its rubber insulation meets UL 94 V-1, limiting flame spread in fault conditions. The 600 V rating covers standard low-voltage distribution circuits. No forced cooling or derating is required within the stated temperature range.

Hex-driven ports and rubber encapsulation

Each of the three ports uses a 5/16 inch hex set screw for secure termination. The black rubber encapsulation protects live parts and eliminates the need for separate tape or heat-shrink. ANSI C 119.4 compliance confirms suitability for insulated power connectors. RoHS compliance meets restricted-substance requirements.

How it compares

Measured against everything we stock in Wire, Cable & Wiring Supplies, at today’s prices. Recalculated every night.

Price $38.99
Pricier than about 61% of the 1,610 comparable items (median $25.99).

Specifications

Product
Brand namePOLARIS
Product typeWire Connectors & Terminals

Questions about this item

How do I install the Polaris ISPBS350 connector and which step is commonly missed?

Strip each conductor, insert into the three ports and tighten the 5/16 in hex screws to secure 12 AWG to 350 kcmil copper or aluminum wire; the step often missed is verifying every strand is fully seated before final torque.

What maintenance or replacement will the ISPBS350 need over time?

Periodically inspect the rubber encapsulation for cracks and re-torque the hex screws if connections loosen; replace the connector if insulation shows degradation or exceeds the 194 °F temperature rating.

What limit appears first when the ISPBS350 runs under sustained load?

The 194 °F maximum operating temperature is the first constraint under continuous current, with the 600 V rating and UL 94 V-1 flammability class defining the electrical and fire-safety boundaries.

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