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Compact copper mechanical connector with slotted head, single hole and tapered tongue

Thomas & Betts

Thomas & Betts Blackburn L70 Compact Connector 14-4 AWG

SKU CH-RDB4-0ND4T

A compact copper mechanical connector for 14 to 4 AWG stranded copper wire rated to 1,000 V and 194 °F

  • Product typeCompact
  • Electrolytic copper construction ensures high conductivity
  • Accommodates 14 to 4 AWG stranded copper conductors
  • Rated for up to 1000 volts maximum voltage
  • Operates reliably up to 194 degrees Fahrenheit
  • Compact single-hole design fits 9/32 inch stud size

Thomas & Betts Blackburn L70 Compact Connector

The Thomas & Betts Blackburn L70 is a new mechanical connector built from electrolytic copper for single-conductor applications. It accepts stranded copper wire from 14 AWG up to 4 AWG and is rated for a maximum operating temperature of 194 degrees F and 1,000 volts maximum voltage. The compact body features a slotted head style with a single mounting hole of 0.28 inch diameter.

Installers joining copper conductors in tight panels

This connector suits electricians and maintenance technicians who need a compact, one-hole lug for copper wire between 14 and 4 AWG. It is not for buyers who require multi-conductor splicing, aluminium conductor compatibility, or a two-hole mounting pattern for vibration resistance. The single termination design also excludes installations needing parallel cable entries.

Wire range 14 to 4 AWG decides fit

The single specification that decides whether this is the right part is the stranded copper wire range of 14 AWG minimum to 4 AWG maximum. Only conductors within this window will seat correctly in the compact barrel and meet the 1,000 V rating. Verifying the wire gauge against this range is essential before ordering.

How it compares

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

Price $2.99
Cheaper than about 95% of the 1,610 comparable items (median $25.99).

Specifications

Product
Brand nameThomas & Betts
Product typeCompact

Questions about this item

How do I install the Blackburn L70 compact connector on a 4-14 AWG copper wire, and what step is often missed?

Strip the wire, insert it fully into the barrel, then tighten the slotted set-screw to the recommended torque; the step most often missed is verifying the screw is snug after the first heat cycle.

What maintenance or replacement will the L70 connector need over time?

Periodically re-torque the slotted set-screw and inspect the electrolytic copper body for oxidation or overheating discoloration; replace the connector if the copper shows pitting or the screw threads are damaged.

What limit appears first on the L70 connector during sustained high-current use?

The 194 °F maximum operating temperature is typically reached before the 1 000 V voltage rating becomes a concern.

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