Terminal Block for Field Wiring: 4 Positions at 5.08 mm Pitch
The TE Connectivity Buchanan 1546074-4 is a 4-position PCB-mount terminal block on a 5.08 mm pitch, designed for screw-terminated field wiring. It accepts wire from 12 AWG down to 30 AWG, with each position rated 17.5 A at 300 V. The housing is black polyamide (PA66) and the screw clamp uses a brass rising cage mechanism plated in nickel — the contact surface is brass with tin plating. This is the 4-position member of the Buchanan series, base product number 1546074.
Wiring and Torque: What the Screw Spec Means in the Field
The M3 screw is torqued to 0.79 Nm (7.0 Lb-In) — that is the spec for the rising cage clamp to grip the conductor without damaging the wire or the block. The clamp material is brass with nickel plating, and the screw itself is the same. The 35° (145°) mating orientation means the wire entry is angled relative to the PCB, which helps route wires in tight enclosures where a straight vertical entry would interfere with the cover or adjacent components.
Ganging Multiple Blocks with the Interlocking Side Feature
The side interlocking feature allows multiple 1546074-4 blocks to be mechanically joined side-by-side into a multi-position assembly on the same pitch. This is useful when you need more than 4 positions but want to keep the same 5.08 mm spacing — the blocks snap together without requiring a separate rail or bracket. The single-level design means each block handles one row of 4 circuits.