Blackburn UPC44SL INSUL BUSCONN 4TERM 4PORTS SL 6-350

The UPC44SL takes conductors from 6 AWG up to 350 kcmil in each of its four ports, which is the range called out in the part's 6-350 designation. That covers most feeder and service taps as well as smaller branch conductors landing on the same bus.

Four. It is a 4-terminal, 4-port insulated bus connector, so you get four separate ports for splicing or tapping multiple conductors onto a single common bus block.

The body is aluminum. Aluminum-bodied mechanical connectors of this style are the dual-rated approach used for both aluminum and copper conductors, so the same block handles a copper tap off an aluminum feeder as long as you follow the listed torque and use the appropriate joint compound on aluminum.

It is an insulated bus connector, so the insulating cover is part of the assembly rather than something you add on the job. That is the practical difference between this and a bare power distribution block you would have to tape or boot in the field.

Use the UPC44SL when several conductors have to come together at one point, for example a feeder tap to multiple panels or a grounding or neutral consolidation. Four ports rated 6 AWG to 350 kcmil land in one insulated block, with mechanical set-screw terminations instead of separate splices. Split bolts or compression sleeves make more sense for a straight one-to-one splice in a pull box, since they take less room and do not need the block's footprint.

Mechanical. Conductors are clamped by set screws in the ports, so it installs with a hex driver or torque wrench and no crimp tool, press, or dies. That makes it workable in a tight gutter or panel where you cannot get a compression head in.

Country of origin is the United States, and it sells as each, so one order quantity is one connector. Worth knowing if you are working a federal, state, or institutional job with domestic-sourcing language in the spec.

Blackburn UPC44SL is the manufacturer part number for the insulated 4-terminal, 4-port connector rated 6 AWG to 350 kcmil. If you are matching what is already installed in a gutter, check the stamp on the existing block, since the UPC family runs in several port counts and wire ranges and the suffix is what tells them apart.