Wiring a 4-Position PCB Terminal Block at 3.81 mm Pitch
The TE Connectivity Buchanan 284415-4 is a 4-position, single-level PCB terminal block with a 0.150" (3.81 mm) pitch. It terminates wires via a rising cage clamp — the screw pulls a brass clamp up against the conductor, creating a gas-tight joint that resists loosening from thermal cycling. The M3 screw has a specified torque of 0.25 Nm (2.2 Lb-In), which is the installation target: too little torque leaves a high-resistance connection that heats under load, too much strips the brass threads. The block accepts 12 to 30 AWG wire, though the full 12 A rating applies only when the wire gauge can support that current without exceeding the temperature rise of the PA66 housing. The interlocking side feature allows multiple 284415-4 blocks to be ganged together side-by-side to create a larger terminal strip without needing a separate end barrier — useful when a design calls for 8, 12, or more positions on a single assembly.
What the 12 A and 300 V Ratings Mean for Your Circuit
In practice, the actual current limit depends on the wire size you land — a 30 AWG signal wire cannot safely carry 12 A, but a 12 AWG power feed can. The rising cage clamp contacts are brass with tin plating, which is adequate for moderate cycle counts in dry indoor equipment — not for high-vibration or corrosive environments where gold plating would be specified.