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Screw terminal

A terminal block that clamps bare wires with a screw: the easy way to bring power in or take a load (LED strip, motor) off a board.

What it does#

A KF301-style block (5.0 mm pitch) holds stripped wire under a screw clamp. Rated far above hobby currents (the catalog parts: 17 A), so power and load wiring is no problem; the board’s copper is the limit.

Example circuit: J1 brings 5 V in with a 1000 µF bulk capacitor. J3 feeds an LED strip: 5V, data (through 330 Ω) and GND.
J1 brings 5 V in with a 1000 µF bulk capacitor. J3 feeds an LED strip: 5V, data (through 330 Ω) and GND. Open the screw_terminal_strip example from this page in PCB Canvas: “Insert into my schematic”.

Tips#

  • Mark the polarity next to the terminal on the silkscreen (+ / −, or the net names). A reversed supply is the most common accident.
  • Wide tracks. 3 A on 1 oz copper needs ~1.5–2 mm wide tracks, or a pour; the net classes widen power nets automatically.
  • Put a fuse or reverse protection after an input terminal (fuse, MOSFET).
  • Terminals sit at the board edge, the wire entry facing out.

Footprint#

Through-hole, 5.0 mm pitch (C474881 2-pin, C474882 3-pin; JLCPCB extended, hand or wave soldered).