The KF390 / DG390 5.0mm Pitch 2-Pin Spring Terminal Block is a screwless, push-in cage clamp terminal block designed for quick, tool-free wire-to-board electrical connections. Engineered with a durable flame-retardant polyamide housing and high-tension stainless steel spring contacts, this 2-way terminal block provides vibration-proof wire retention, low contact resistance, and rapid wiring termination. It is widely used in industrial automation, smart home controllers, LED lighting drivers, power distribution boards, and microcontroller prototyping boards.

Specifications

• Model / Series: KF390 / DG390 Series (Screwless Spring Terminal Block)
• Number of Pins / Ways: 2-Pin (2-Way)
• Pin Pitch / Spacing: 5.0mm (0.197 inches) / 5.08mm compatible
• Termination Method: Push-In Spring Clamp (Screwless / Tool-Free lever actuation)
• Rated Voltage: 250V to 300V AC/DC (IEC / UL standard)
• Rated Current: 10A (IEC) / 8A to 10A (UL)
• Dielectric Withstanding Voltage: 2000V AC for 1 minute
• Contact Resistance: ≤ 20mΩ
• Insulation Resistance: ≥ 5000MΩ (at 500V DC)
• Applicable Wire Gauge: 22 AWG to 14 AWG (0.5mm² to 2.5mm² solid or stranded wire)
• Wire Strip Length: 8mm to 10mm
• Housing Material: Polyamide (PA66, UL94 V-0 flame retardant)
• Contact / Pin Material: Tin-Plated Brass / Phosphor Bronze Solder Pins
• Spring Clamp Material: High-Tension Stainless Steel
• Operating Temperature Range: -40°C to +105°C
• Mounting Type: PCB Through-Hole Solder Mount

Features

• Screwless Push-In Clamping: Allows fast, single-handed wire insertion by simply depressing the top spring actuator lever with a small screwdriver or finger.
• Vibration-Proof Retention: Constant spring pressure automatically adjusts for wire expansion and eliminates screw loosening caused by mechanical vibrations.
• Compact 5.0mm Pitch Design: Saves valuable PCB space while providing adequate high-voltage clearance and creepage distances.
• High-Grade Flame Retardant Housing: Molded from UL94 V-0 PA66 thermoplastic to ensure safety and thermal stability under continuous loads.
• Modular Side Interlocking: Many variants feature side interlocking dovetail tabs, allowing multiple 2-pin units to be snapped together to form longer terminal strips.

Common Applications

• Microcontroller & Development Boards: Quick power and I/O wire connection for Arduino, ESP32, relay modules, and custom PCB projects.
• Industrial Automation & PLCs: Rapid signal wiring and sensor inputs in industrial control cabinets.
• Smart Home & Building Automation: Thermostats, motorized blind controllers, and home automation nodes.
• LED Power Supplies & Drivers: Output line terminations for constant-voltage/constant-current LED strips and fixtures.
• Security & Fire Alarm Panels: Zone wiring and power distribution connection blocks.

Usage Tips

• Wire Preparation: Strip approximately 9mm of insulation from the wire end. For stranded copper wire, twisting the strands or crimping a bootlace ferrule provides the cleanest insertion.
• Wire Insertion: Press the top actuator lever down firmly using a 2.0mm–2.5mm flathead screwdriver, insert the stripped wire into the round hole, and release the lever to lock the wire in place.
• Soldering Precaution: Solder the through-hole pins at 350°C for no more than 3 seconds per pin to avoid softening the plastic housing or loosening the solder pins.
• Current Sizing: Ensure PCB copper traces connecting to the solder pins are wide enough (or reinforced with exposed solder tinning) when running continuous currents near the 10A rating.