Wiring a 24-Position PCB Terminal Block at 5.08mm Pitch
The TE Connectivity Buchanan 2-282837-4 is a 24-position, single-level PCB terminal block on a 0.200" (5.08mm) pitch. It terminates wires with a screw-driven rising cage clamp — the screw turns a clamp that rises to pinch the stripped conductor against the current bar, giving a gas-tight connection without damaging the wire strands. Wire range is 16-28 AWG; the M3 screw is torqued to 0.68 Nm (6 Lb-In).
Sizing the Connection: Current, Voltage, and Wire Range
The 16-28 AWG wire range covers most signal and low-power wiring; the rising cage clamp grips solid and stranded wire equally well. The M3 screw torque of 0.68 Nm is firm enough to hold the wire under vibration but not so high it strips the threads in the PA66 housing. The interlocking side feature lets you snap multiple blocks together side-by-side to build wider assemblies — the alignment ribs keep the pitch consistent across the gang.
Mounting and Wiring on the Board
Through-hole solder pins mount the block to the PCB — the 0.200" (5.08mm) pitch matches the standard terminal block footprint. Wires enter horizontally (parallel to the board), so leave clearance on the side of the block for the wire bend radius. The rising cage clamp accepts stripped wire directly; no ferrule is required, though ferrules help with fine-stranded wire in the 16-28 AWG range. The screw head is accessible from the top for termination after the block is soldered to the board.