Blackburn ASR3506 SPLICE REDUCER SLD BARRIER 6STR-350

Yes. The ASR3506 is a dual-rated terminal, so it's listed for aluminum and copper conductors. The body is aluminum with a tin-plated surface, which is what makes the connection to copper acceptable and keeps the aluminum from oxidizing at the contact surface.

It's a reducing splice covering the 6 STR through 350 range, so it joins a larger conductor up to 350 to a smaller one down to 6 stranded. Because it's a reducer, the two ends are different sizes, which is the whole point of the part: you use it where a feeder steps down rather than running a same-size splice.

Compression. The ASR3506 is a wire or cable compression splice, so it's installed with a hydraulic or battery crimp tool and the correct die, not tightened with a screwdriver or torque wrench. Budget for the die set if you don't already run one for this size range.

The splice has a solid internal barrier between the two conductor entries. Each conductor bottoms out against it rather than passing through, so the barrel is crimped on each side independently and you get a positive stop that tells you the conductor is fully inserted before you compress. It also keeps the aluminum and copper ends separated in a dual-rated splice.

It's a bare tin-plated aluminum compression splice, so insulating is a separate step. Plan on heat-shrink tubing, a cold-shrink sleeve, or tape and mastic buildup rated for the circuit voltage once the crimp is made.

Sold each. One ASR3506 splices one conductor pair, so a three-phase step-down with a neutral takes four pieces. Order the count for the run plus spares, since a mis-crimped compression splice is cut off and discarded, not reused.

Manufacturer part number ASR3506, Blackburn brand, country of origin Mexico. Include the UL E9809 file number if the submittal asks for the listing reference.