What this 2-circuit barrier block is built for
The TE Connectivity Buchanan 1546477-2 is a 2-circuit, dual-row barrier terminal strip with a 0.433" (11.00mm) pitch, designed for panel or chassis mounting where you need to land a power feed and its return on one compact block. The 25A per-circuit rating and 300V voltage rating put this squarely in branch-circuit territory — think 120/240VAC distribution inside an industrial control cabinet, or a DC bus feed to a motor drive. The dual-wall barrier between terminals (2 Wall (Dual) construction) keeps wire strands from bridging circuits when the stripped length is a little generous, which is the kind of thing that saves a troubleshooting call on a Friday afternoon. The flange on each end takes a screw for panel mounting — this block is not a PCB-mount part, it's meant to be screwed to a chassis or sub-panel with the wires landed on the screw terminals.
Wire range and termination — what fits and how it clamps
The 1546477-2 accepts 14 AWG to 22 AWG wire. That 14 AWG bottom end is what lets it carry the full 25A without the wire itself becoming the bottleneck — 14 AWG copper is rated for about 15-20A in chassis wiring, so the terminal block rating is actually above what the wire can safely carry in free air; in practice the wire gauge and the overcurrent protection device set the limit. The bottom termination is closed, meaning the screw does not pass through to the other side; this is a single-sided termination block, not a feed-through. The terminal screw is steel with a nickel finish, which gives good corrosion resistance in a cabinet environment without the galvanic risk of bare steel against copper wire. The 2-circuit block has 4 wire entries — two per circuit, one on each side of the barrier — so you can daisy-chain a feed wire and a load wire on the same terminal. The 0.433" (11.00mm) pitch is wide enough that you can get a standard 3/16" or 5 mm slotted screwdriver on the screw without shorting to the adjacent terminal.
Where this fits in the Buchanan series
The 1546477-2 is the 2-circuit member of the TE Buchanan barrier strip family, base number 1546477. The series spans from 1 to 24 circuits at the same 0.433" (11.00mm) pitch, all sharing the same 25A/300V rating, the same dual-wall barrier, and the same captive-plate screw termination. The 2-circuit version is the smallest in the line — it's the one you spec when you only need to break a single pair of power conductors at a panel interface, rather than running a multi-circuit strip with unused positions. The flange is standard across the series, so the mounting hole pattern is the same whether you use the 2-circuit or the 12-circuit version; the panel cut-out just gets longer.