A Circuit Breaker Screw Clamp Terminal is a mechanical connection component that achieves electrical connection by securing external conductors with screw pressure. Its electrical performance primarily depends on contact resistance, conductor clamping force, conductive material properties, surface plating quality, and thermal stability under rated current. For circuit breakers, switchgear, control cabinets, and high-voltage DC systems in new energy vehicles, correct terminal selection directly impacts connection reliability and equipment maintenance cycles.
What Is a Circuit Breaker Screw Clamp Terminal?
A Circuit Breaker Screw Clamp Terminal is a type of electrical terminal designed to connect external wires with internal conductive circuits through a screw clamping mechanism. The terminal structure normally consists of:
| Component | Engineering Function |
| Conductive frame | Provides the current transmission path |
| Screw clamp mechanism | Generates mechanical pressure on the conductor |
| Copper alloy contact section | Reduces electrical resistance |
| Insulating housing | Provides electrical isolation and mechanical protection |
| Surface plating layer | Improves corrosion resistance and contact stability |
Unlike soldered connections, screw clamp terminals allow repeated installation and removal, making them suitable for industrial electrical equipment requiring maintenance access.
Typical applications include:
- Circuit breakers
- Distribution boards
- Industrial control cabinets
- Motor control systems
- Solar power distribution equipment
- EV charging infrastructure
- Battery energy storage systems
The primary engineering challenge is maintaining stable contact pressure during long-term operation. Thermal cycling, vibration, conductor expansion, and oxidation can increase contact resistance if the terminal design is insufficient.
What are the main types and structural differences of electrical terminal blocks?
Modern electrical systems utilize specific terminal geometries tailored to distinct voltage, current, and space parameters.
Screw Lug Terminal
Composed of a wire-entry plug and a PCB-soldered socket, terminals utilize locking flanges and retention latches to maintain gas-tight connections under mechanical stress. Sockets support horizontal, vertical, and angled orientations, making them the most widely specified PCB interface.
Terminal Block Clamp
Mounted on standard DIN rails within control cabinets, terminals feature an internal sliding metal link that acts as a circuit breaker. Loosening the clamping screw and shifting the slide isolates the circuit for live testing without disrupting wiring, supported by integrated test sockets.
Screw Clamp for Fuse Terminal
Designed to house standard cartridge fuses, these terminals provide integrated overcurrent protection. Upon circuit overload, the fuse element melts to isolate downstream equipment.
Material Standards: Current-carrying components utilize electrolytic copper for optimal conductivity, paired with modified PA66 nylon housings offering high dielectric strength and mechanical rigidity. Clamping yokes consist of stress-corrosion-resistant copper alloys, with all metallic contact surfaces electroplated with tin or nickel.
Double Screws Terminal Block for Electric Meter
Engineered for space-constrained control panels, terminals double wiring density within the same DIN-rail footprint, eliminating external jumper requirements and increasing circuit exit points.
| Terminal Type | Primary Application | Conductor Fixing Method | Key Advantage |
| Pluggable | PCB Interface / I/O | Screw / Spring Cage | Rapid disconnect and modular replacement |
| Test/Disconnect | Metering / Control Panels | Sliding Link / Screw | Safe live-circuit diagnostics |
| Fuse | Overload Protection | Spring-loaded Clip | Integrated circuit protection |
| Double-Level | High-Density Cabinets | Multi-tier Screw Clamp | 100% increased density |
Consult Our Electrical Engineers Today
Frequently Asked Questions about Cage Terminal Mechanical Parts
What international standards does your Wire Clamp Terminal with Screw comply with?
All products are manufactured in strict compliance with standards, backed by full IATF 16949 material traceability and RoHS/REACH compliance documentation.
What is the standard lead time for Pre-Assembled Screw Wire Terminal production runs?
Tooling development and prototyping typically require 15 to 25 days, while standard production batch delivery takes 3 to 4 weeks, depending on raw material specifications and order volume.
Can you provide material test reports and plating thickness verification for the Galvanized Steel Screw Terminal Clamp quality inspection?
Yes. Every shipment includes full material test reports (MTR), XRF plating thickness verification data, and dimensional inspection sheets generated by our internal metrology laboratory.
contact us
We possess the capability for large-scale production of the full range of Circuit Breaker Screw Clamp Terminals, and can customize non-standard specifications to suit special working conditions. Our factory has passed relevant IEC standard certifications, and our production capacity can meet the needs of expedited delivery for large-volume orders. We sincerely invite companies with purchasing or customization needs to contact us immediately to obtain customized technical solutions and quotations.
