The KF128V 5.08mm Pitch 3-Pin Terminal Block (High Quality) PCB Mount is a heavy-duty, vertical-entry screw-clamp wire-to-board connector engineered for robust, high-reliability field connections on printed circuit boards. Featuring standard 5.08mm (0.2-inch) pin pitch, it employs top-entry clamping with straight vertical (180°) wire insertion, making it the ideal solution for dense enclosures where horizontal wire entry is blocked by tall electrolytic capacitors, heat sinks, or chassis walls. Built with a reinforced phosphor bronze / brass rising clamp mechanism, corrosion-resistant tinned copper alloy solder pins, and an impact-resistant flame-retardant polyamide (PA66) housing with interlocking dovetail rails, this high-quality connector guarantees minimal contact resistance, superior pull-out retention, and dependable high-current power distribution for industrial automation, motor drives, and mains-switching hardware.

Specifications

• Connector Series / Model: KF128V (Vertical Wire Entry Type)
• Quality Grade: High Quality (Heavy-duty brass rising cage clamp & premium PA66 housing)
• Pin Pitch / Terminal Spacing: 5.08 mm (0.20 Inches)
• Number of Poles / Positions: 3 Pins (3-Way / 3-Pole)
• Wire Entry Orientation: Vertical (180° Top-Entry relative to PCB surface)
• Rated Operating Voltage: 300 V AC / DC
• Rated Current Capacity: 15 A to 20 A Max.
• Dielectric Withstanding Voltage: 2000 V AC for 1 minute
• Insulation Resistance: ≥ 5000 MΩ (at 500 V DC)
• Contact Resistance: ≤ 15 mΩ (High-conductivity, low-loss terminal interface)
• Compatible Wire Gauge: 24 AWG to 12 AWG (0.5 mm² to 2.5 mm² solid or stranded wire)
• Wire Strip Length: 6.0 mm to 7.0 mm
• Screw Fastener Type: M2.5 Metric Precision Slotted / Phillips Steel Screws (Zinc-plated / nickel-plated)
• Tightening Torque: Approx. 0.5 N·m (4.4 lbf·in)
• Internal Clamp / Cage Material: High-Tensile Brass / Phosphor Bronze (Non-shearing rising clamp design)
• Solder Pin Terminal Material: Tinned High-Conductivity Copper Alloy
• Solder Pin Dimensions: Approx. 0.8 mm × 1.0 mm (Recommended PCB drill hole: 1.3 mm to 1.5 mm)
• Insulating Body Material: Polyamide 66 (PA66, UL 94V-0 Flame Retardant, Industrial Green)
• Modular Assembly: Side Interlocking Dovetail Grooves (Expandable into custom multi-pole arrays)
• Operating Ambient Temperature: -40°C to +105°C
• Overall Dimensions: Approx. 15.24 mm × 10.0 mm × 14.0 mm (L × W × H excluding solder pins)
• Net Weight: Approx. 4.5 g to 5.8 g per piece

Features

• Vertical Top-Entry Cable Alignment: Accommodates perpendicular wire runs dropping directly onto the PCB, eliminating horizontal cable bending stress in cramped equipment chassis and DIN rail housings.
• Rising Cage Clamp Mechanism: High-grade brass rising cage lifts smoothly to trap wire conductors securely across a broad contact area, avoiding strand cutting or gouging during torque application.
• Modular Dovetail Interlock System: Side tongue-and-groove rails allow multiple 2-pin and 3-pin blocks to be combined into custom 6-pin, 9-pin, or continuous terminal strips while preserving 5.08mm center-to-center pitch.
• UL 94V-0 Flame-Retardant PA66 Body: Ruggedized engineering nylon shell provides high dielectric isolation, resists wave soldering heat, and withstands harsh industrial operating temperatures without embrittlement.
• Heavy Tin-Plated Terminals: Solder pins feature thick tin plating over a copper alloy core, promoting fast capillary solder wetting and preventing long-term galvanic corrosion in high-humidity environments.

Common Applications

• Mains AC Relay Modules: Terminating Live, Neutral, and Earth/Ground lines or 3-terminal SPDT relay contact connections (Normally Open, Common, Normally Closed).
• 3-Phase & Stepper Motor Drives: Interfacing brushless DC (BLDC) motor phase leads (U, V, W) and high-current stepper coil wires on CNC and 3D printer controller boards.
• Industrial Power Supplies: High-current terminals for Dual-Rail DC supplies (+V, GND, -V) or auxiliary battery-backup charging circuits.
• Analog & Digital Sensor Busses: Heavy-duty field terminal connections for 3-wire industrial transducers and telemetry transmitters (VCC, 4–20mA / 0–10V Signal, Ground).
• Solar & Renewable Energy Hubs: Connecting solar PV panels, charge controllers, and battery bank balance feeds in off-grid power systems.

Usage Tips

• Proper Screw Torquing:
  • Tighten the M2.5 clamping screws to a recommended torque of 0.4 N·m to 0.5 N·m.
  • Use an appropriately sized screwdriver bit (#1 Phillips or 3.0mm flat blade). Avoid over-torquing beyond rated specifications to prevent stress fractures on the PCB solder pads.
• Wire Stripping & Ferrule Recommendations:
  • Strip wire insulation cleanly to 6.0 mm to 7.0 mm. Stripping too short may result in the clamp biting into the insulation jacket rather than bare conductor.
  • For flexible, multi-stranded copper wire, crimp an insulated bootlace ferrule onto the wire end to prevent stray copper strands from causing inter-pin short circuits.
• PCB Pad & Hole Layout:
  • Drill PCB through-holes to 1.3 mm to 1.5 mm in diameter with wide annular copper rings.
  • Sufficient solder pad surface area provides necessary mechanical anchorage against the rotational torque applied when field wires are tightened down.
• Soldering Temperature & Dwell Time: Solder pins at 330°C to 350°C for approximately 2 to 3 seconds per pin using quality leaded or lead-free solder wire to establish shiny, complete 360° solder fillets on both sides of the board.
• Modular Gang Pre-Assembly: When chaining blocks together using the side dovetails, assemble the complete multi-pole row before inserting and soldering the pins into the circuit board to avoid mechanical pin misalignment and solder joint shear stress.