Blackburn AMTD350103 AL MULTI BOTHSIDE CONN 3PORT 350-10

The AMTD350103 is a 350-10 range connector, so each of its three ports takes conductors from 350 kcmil down to 10 AWG. That range covers typical feeder taps down to small branch conductors in the same block, which is why it gets used for tapping a large service conductor to smaller loads.

Yes, it carries a 600 V rating, which covers standard commercial and industrial power distribution at 120/208, 277/480, and 600 V. It is UL listed under E9809 and CSA certified under 6591.

The body is aluminum, and Blackburn's AMTD-style multi-tap connectors are built for both aluminum and copper conductors, which is what the AL designation plus dual-rating hardware is for. Use the correct joint compound practice for aluminum terminations and torque each port to the value marked on the block.

Both-side means the connector is wired from either face, with ports accessible from both sides of the block rather than all set screws entering from one direction. In a crowded panel or pull box that decides whether you can actually reach the set screws once the conductors are dressed in, so measure your working clearance before you commit to a single-side block.

Three. It is a 3-port multi-tap block, so one run conductor plus taps, or three separate conductors, all landing in the same insulated body. If you need more taps off the same feeder you need a higher port count block rather than doubling conductors into one port, which is not permitted unless the port is marked for it.

It ships as each, one connector per unit. For a three-phase plus neutral tap you would order four, one per conductor, since each block handles a single phase.

Country of origin is the United States, which matters on federally funded and Buy American specified work where domestic sourcing has to be documented on the submittal.