Blackburn SWD210A1304 SWG XFORM LINK TNCU 2100A 4H 304MM

It's a flexible braid connector, or transformer/switchgear link, used to make a current-carrying connection between two rigid bus or terminal pads where some movement, thermal expansion, or vibration has to be absorbed. The conductor is flat flexible tin-plated copper braid with a bolt pattern at each end, so it bolts in place rather than being crimped to cable. Rated 2100A per the model designation.

It's a 4-hole configuration, so each end lands on a four-bolt pad pattern. That matters more than the ampere rating when you're matching to existing switchgear: the pad drilling on your breaker or transformer terminal has to match the braid's hole pattern and spacing, or you'll be drilling pads in the field. If your gear uses a two-hole NEMA pad, a 4-hole link is the wrong part.

The conductor is tin-plated copper. The tin plating is there to resist oxidation and is what allows the braid to be landed on aluminum bus or aluminum terminal pads without the bare copper-to-aluminum galvanic problem. Use the joint compound and bolting hardware your gear manufacturer specifies for the pad material.

A solid bar transmits every bit of thermal growth and vibration straight into the bolted joint and the equipment bushings, which is how pads crack and joints loosen. Flat flexible braid takes that movement instead, so it's the standard choice at transformer bushings, breaker connections, and any point where two pieces of gear move independently. Compared with a cable jumper, flat braid gives a wider bolted contact face at the pad and a lower profile in tight cubicles. This one is flat, flexible, and drilled 4-hole per end at 304 mm.

Order by the manufacturer part number, SWD210A1304. The designation carries the rating and size: 2100A, 4-hole, 304 mm flat tin-plated copper braid. If your existing link has a different length or hole count, the part number changes with it, so pull the number off the old link or measure pad centers before reordering.

Sold each. A three-phase connection needs three links, so order by phase count plus any spares. For a typical three-phase bank that's a quantity of three of the same part number, and if your neutral or ground link uses the same pad pattern you'll want a fourth.

Country of origin is the United States. That's the detail to carry onto the submittal for federal, utility, or Buy American-restricted work, where the connector's origin has to be documented alongside the bus and conductor.