KF8500HL-8.5 PCB Screw Terminal Blocks | 8.5mm Pitch Barrier PCB Mount Wiring Connector
For switching power supplies, motor drive boards, industrial controllers and new energy circuit boards, high-current PCB wiring requires sufficient creepage distance, stable clamping force and flame-retardant insulation to avoid arc short-circuit risks. The KF8500HL-8.5 PCB screw terminal block is a heavy-duty barrier-type wiring connector with 8.5mm fixed pitch, upgraded long-body HL version design to expand wiring space, perfectly solving high-current wire connection demands on printed circuit boards, widely adopted in medium-power industrial electronic equipment.
What Is KF8500HL-8.5 PCB Screw Terminal Block?
KF8500HL-8.5 belongs to classic KF8500 series barrier PCB screw terminal blocks, HL stands for extended long housing design, fixed center pitch of 8.5mm between poles. It is through-hole DIP soldering type, integrated one-piece barrier isolation structure with independent wiring cavity per pole, standard straight vertical soldering pins for PCB wave soldering production lines.
Complete pole specifications: 2P,3P,4P,5P,6P,7P,8P,9P,10P customizable splicing. Compared with standard short-body KF8500, KF8500HL lengthens the wire inlet cavity, easier to insert 2.5mm² thick stranded wires without wire extrusion deformation, more friendly for manual wiring assembly.
Core Advantages Of KF8500HL-8.5 PCB Terminal Blocks
1. 8.5mm Wide Pitch, Safe Creepage For 450V High Voltage
The 8.5mm large pole spacing provides sufficient insulation clearance between adjacent live poles, fully compliant with IEC high-voltage safety standards, rated up to 450V AC, withstands 2500V dielectric voltage for 1 minute without breakdown. Effectively eliminate electric arc and creepage short-circuit hazards in high-current power supply PCBs, far safer than small-pitch 3.5/5.0mm terminals for medium-power circuits.
2. HL Long-Body Extended Wiring Cavity, Easy Thick Wire Installation
The extended long housing design of our KF8500HL-8.5 PCB screw terminal blocks enlarges internal wire insertion space, compatible with both solid single-core and flexible multi-strand wires up to 2.5mm² cross-section. Operators can fully insert stripped copper strands without wire bending or extrusion, reducing wiring difficulty on mass production lines and lowering defective assembly rates.
3. Reinforced Screw Clamp Structure, Anti-Vibration Stable Conductivity
Adopt M3 carbon steel anti-loose captive screw + thickened tin-plated copper alloy pressure plate. Uniform screw clamping force tightly locks wire cores, no loose contact or resistance rise under long-term vibration of motors and compressors. Thick copper conductive inserts reduce contact heat generation, supporting continuous 24A full-load current without overheating. Tin plating treatment prevents oxidation and corrosion in humid cabinet environments, extending terminal service life.
4. UL94-V0 Flame Retardant PA66 Insulating Shell
Terminal housing is injection molded with high-toughness PA66 nylon reaching UL94-V0 fire resistance grade, operating temperature range -40℃ ~ +105℃. Independent double barrier partitions separate each wiring pole, block electric arc spread, resist oil mist, dust and temperature fluctuation, suitable for workshop, outdoor power and new energy equipment harsh working conditions. Standard industrial green shell color for clear circuit identification.
5. Through-Hole DIP Mount, Perfect Match Mass PCB Production
Vertical straight soldering pins are precisely positioned for standard PCB through-hole drilling layout, compatible with automatic wave soldering machines. Modular splicable multi-pole design allows engineers to select exact pole numbers according to circuit input/output demands, no redundant empty poles occupying PCB layout space. Widely applicable equipment scenarios:
- Switching power supply & adapter circuit boards
- Inverter, servo motor drive control panels
- PLC auxiliary signal & power wiring boards
- Solar small charging controller PCB
- Medical equipment, industrial instrument mainboards
6. Full Global Export Compliance
All KF8500HL-8.5 PCB terminal blocks pass CE, RoHS, REACH international environmental certifications, strictly follow IEC60947 electrical safety standards, meet inspection requirements for EU, Southeast Asia, Middle East and North America wholesale markets. Stable precision stamping, injection and electroplating processes guarantee consistent product quality, support small sample trial orders and large batch bulk supply.
Standard Technical Parameters of KF8500HL-8.5
- Model: KF8500HL-8.5
- Pitch: 8.5mm fixed center distance
- Rated Voltage: 450V AC
- Rated Current: 24A per pole
- Withstand Voltage: 2500V / 1min
- Applicable Wire: 0.5 ~ 2.5mm² solid & stranded copper wire
- Housing Material: UL94-V0 Flame Retardant PA66 Nylon (Standard Green)
- Conductor Material: Thickened Tin-Plated Copper Alloy
- Screw Spec: M3 Captive Anti-Loose Steel Screw
- Mounting Method: Vertical Through-Hole DIP PCB Soldering
- Available Poles: 2P ~ 10P Customizable
- Certification: CE, RoHS, REACH, IEC60947 Compliant
- Operating Temp: -40℃ ~ +105℃
Step-by-Step Wiring & Soldering Operation Guide
- Insert vertical soldering pins of KF8500HL-8.5 terminal into reserved PCB through holes;
- Complete wave soldering or manual soldering to fix terminal block firmly on circuit board;
- Strip wire insulation to 8–10mm, fully insert clean copper core into extended HL wiring cavity;
- Tighten M3 screw clockwise with flat screwdriver to clamp wire tightly without shaking;
- For wire replacement, loosen screw counterclockwise and pull wire out directly, no damage to PCB pads.
Why Choose Our KF8500HL-8.5 PCB Screw Terminal Blocks?
We are professional manufacturer of barrier PCB wiring terminals with integrated stamping, injection molding and electroplating production workshops. Our KF8500HL-8.5 PCB screw terminal blocks adopt thicker copper conductive inserts and thicker tin anti-rust coating than generic low-cost market versions, avoiding heat aging under long high-current load.
Precision mold injection forms smooth burr-free plastic shell, clear model marking on side for fast engineer model selection. We support custom housing color, printed LOGO and mixed-pole bulk packaging, sufficient spot stock of standard 2P~10P specifications for fast global delivery. One-stop supply matching pluggable PCB terminals, DIN rail terminals and cold crimp wire connectors for electronic equipment manufacturers and electrical distributors.
Final Summary
KF8500HL-8.5 8.5mm pitch PCB screw terminal block is a heavy-duty long-body barrier wiring connector specially designed for medium-high current power PCB circuits. Featuring wide 8.5mm safe insulation pitch, HL extended large wiring cavity, reinforced anti-vibration screw clamp structure, UL94-V0 flame retardant housing and full customizable pole options, these PCB terminals solve the wiring pain points of thick wire insertion difficulty and high-voltage arc risk for power supply, drive and industrial control circuit boards. Adopting KF8500HL-8.5 terminals improves production assembly efficiency, ensures long-term stable high-current circuit operation and reduces electrical failure hidden dangers for electronic finished products.
Keywords: KF8500HL-8.5 PCB Terminal Block, KF8500HL Screw Connector, 8.5mm Pitch Barrier PCB Terminal, High Current PCB Wiring Block, Power Supply PCB Terminal