11-Position, 5.08 mm Pitch, 24 A — Power-Duty PCB Terminal Block
The 1-282857-1: The 5.08 mm pitch is the defining dimension for board layout — it's wider than the 3.5 mm or 5.0 mm blocks common in signal-duty applications, which is consistent with the 24 A current rating. At this pitch, each pole occupies enough board area to handle the copper trace width needed for 24 A without excessive temperature rise. Termination is via a screw-rising cage clamp — turning the M3 screw (torque spec 0.79 Nm / 7.0 Lb-In) raises a nickel-plated brass clamp plate that presses the wire against the current bar. The wire range covers 12 AWG down to 30 AWG. The housing is green polyamide PA66 / Nylon 6/6 — the standard color for the Buchanan series, which helps identify the series on a populated board. The interlocking (side) feature on the housing allows multiple blocks to be snapped together side-by-side into a continuous strip without a separate end bracket or jumper bar for mechanical alignment.
At 24 A, the voltage drop across the tin-plated brass contact and the screw-clamp interface is low enough that self-heating stays within the PA66 housing's continuous-use temperature. For 24 V DC applications (a common query), the 300 V rating provides ample margin — the block is electrically over-specified for 24 V, so the limiting factor becomes the current draw and the PCB trace width feeding each pole. The single-level, 11-position layout means all 11 circuits terminate on one row. The M3 screw with 0.79 Nm torque spec is consistent with the 12 AWG maximum wire size — at that torque, the cage clamp develops enough force to keep contact resistance stable under thermal cycling without stripping the brass screw.
The base product number is 282857, and the series is Buchanan — a long-running TE terminal block family. There is no last-time-buy window or phase-out notice on record.