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TERM BLK 2POS TOP ENTRY 5MM PCB |
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HAR-FLEXICON, 10PIN TERMINAL BLO |
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TERM BLK 4POS SIDE ENTRY 5MM PCB |
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TERM BLK 4POS TOP ENTRY 5MM PCB |
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HAR-FLEXICON, 3PIN TERMINAL BLOC |
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HAR-FLEXICON, 3PIN TERMINAL BLOC |
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HAR-FLEXICON, 11PIN TERMINAL BLO |
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TERM BLK 8POS TOP ENT 3.81MM PCB |
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TERM BLK 3POS TOP ENTRY 5MM PCB |
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HAR-FLEXICON, 7PIN TERMINAL BLOC |
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HAR-FLEXICON, 11PIN TERMINAL BLO |
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TERM BLK 3POS SIDE ENT 3.5MM PCB |
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TERM BLK 12P SIDE ENT 3.5MM PCB |
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TERM BLK 3POS TOP ENT 3.81MM PCB |
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HAR-FLEXICON, 3PIN TERMINAL BLOC |
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HAR-FLEXICON, 4PIN TERMINAL BLOC |
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TERM BLK 3POS SIDE ENTRY 5MM PCB |
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TERM BLK 8POS TOP ENTRY 5MM PCB |
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HAR-FLEXICON, 5PIN TERMINAL BLOC |
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HAR-FLEXICON, 16PIN TERMINAL BLO |
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Terminal blocks - wire to board are modular, insulated connectors used to securely join wires to printed circuit boards (PCBs). They provide reliable electrical connections while enabling easy maintenance and reconfiguration. These components play a critical role in bridging wired systems with electronic control units, ensuring signal integrity and power transmission in applications ranging from industrial automation to consumer electronics.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| Screw Terminal Blocks | Use screws for mechanical clamping force, offering high reliability and vibration resistance | Industrial control panels, HVAC systems |
| Spring Clamp Terminal Blocks | Utilize spring pressure for quick wire insertion/removal without tools | Smart home devices, test equipment |
| IDC (Insulation Displacement Connectors) | Cut through wire insulation for rapid termination, eliminating pre-stripping | Telecom equipment, automotive wiring harnesses |
| Push-in Terminal Blocks | Accept pre-stripped wires with minimal insertion force | Lighting control systems, factory automation |
| PCB Terminal Blocks | Through-hole or surface-mount designs optimized for board-level integration | Medical devices, embedded systems |
A typical wire-to-board terminal block consists of: - Insulating Housing: Made from high-temperature resistant thermoplastics (e.g., PA66, PBT) for dielectric isolation - Conductive Terminals: Brass or phosphor bronze contacts with plating (Sn, Ag, Au) for corrosion resistance - Clamping Mechanism: Screw, spring, or lever-actuated systems for wire fixation - PCB Interface: Male/female contacts or solder tails for board mounting - Retention Features: Polarization keys and mechanical stops to prevent misalignment
| Parameter | Importance | Typical Values |
|---|---|---|
| Rated Current | Determines maximum continuous operating current capacity | 1-30A |
| Rated Voltage | Defines safe operating voltage range | 50-600V |
| Contact Resistance | Impacts power loss and thermal performance | 10m |
| Insulation Resistance | Ensures electrical safety and signal integrity | 100M |
| Operating Temperature | Determines material stability in working environment | -40 C to +120 C |
| Wire Gauge Range | Specifies compatible conductor sizes | 26-4AWG |
| Material Glow-Wire Rating | Measures fire resistance per IEC 60335 | 650-960 C |
Key industries include: - Industrial Automation: PLCs, motor drives, CNC machines - Consumer Electronics: Home appliances, audio equipment - Renewable Energy: Solar inverters, wind turbine controllers - Medical Equipment: Diagnostic devices, patient monitors - Automotive: EV charging systems, battery management units
| Manufacturer | Representative Product | Key Features |
|---|---|---|
| Phoenix Contact | PTSA 1.5/2-H-PE | Spring clamp, 1.5mm wire capacity, push-in PCB interface |
| TE Connectivity | CXT PCB Terminal Block | Surface-mount design, 3A rating, halogen-free |
| Weidm ller | SAM 2.5/ 4-GN | Plug-in connectors, vibration-proof, 2.5mm pitch |
| Molex | PicoBlade 0.8mm | Ultra-compact IDC terminals for fine wires |
Key considerations: 1. Electrical Requirements: Match current/voltage ratings with system specifications 2. Mechanical Needs: Choose clamping method based on maintenance frequency 3. Environmental Factors: Select materials for temperature/humidity extremes 4. PCB Compatibility: Verify pitch, height, and footprint specifications 5. Total Cost: Balance upfront cost vs. long-term reliability in mission-critical applications
Emerging trends include: - Miniaturization for IoT and wearable devices - High-density connectors supporting 0.4mm pitch - Smart terminal blocks with integrated diagnostics - Increased adoption of press-fit technology - RoHS-compliant materials with improved tracking resistance - Connectors for high-voltage EV systems (800V+)