What This Buchanan Terminal Block Is
The TE Connectivity Buchanan 282857-9 is a 9-position, single-level PCB terminal block from the Buchanan series, designed for permanent wire-to-board termination in power distribution and control wiring applications. The green polyamide (PA66) housing carries the rising cage clamp termination — the M3 screw drives a brass clamp that pulls the wire against the current bar, giving a gas-tight connection across the full 12-30 AWG range.
Key Ratings and Termination Specs
Rated 24 A at 300 V, the 282857-9 is built for branch-circuit power levels — one terminal block can carry a lighting circuit or a small motor feed. The rising cage clamp is the key termination detail: the screw torque of 0.79 Nm (7.0 Lb-In) is the field reference — the installer needs a calibrated driver to hit that spec. Under-torque leaves a high-resistance joint that heats under load; over-torque strips the M3 brass threads. The clamp material is brass with nickel plating, the screw is brass with nickel plating, and the contact bar is brass with tin plating — the tin plating on the current path is standard for stationary terminations where mating cycles are not a factor.
The 5.08 mm pitch sets the hole pattern: a standard 0.200-inch grid, compatible with many European terminal block footprints. The interlocking side feature allows multiple blocks to be ganged side-by-side on the same rail without gaps, forming a continuous terminal strip of any position count. The single-level design means all nine positions are on one row, simplifying routing compared to a two-level block.
Position Count Variants in the 282857 Series
The 282857 family covers several position counts at the same 5.08 mm pitch and 24 A rating. The 9-position 282857-9 sits above the 7-position 282857-7 and the 6-position 282857-6, and below the 4-position 282857-4. All other specs (pitch, current, voltage, torque, wire gauge, screw thread, housing material, color) are identical across the family, so the choice is purely the number of circuits on the BOM.
It is a current-production part from TE Connectivity's Buchanan line, sourced through independent distribution.