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Fixed Contact Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A fixed contact is the stationary electrode component within a medium voltage vacuum interrupter module that establishes and maintains electrical connection with the moving contact. It is designed to withstand high electrical currents, arcing during interruption, and maintain precise alignment for consistent performance in circuit breaking applications.

Working Principle

The fixed contact remains stationary while the moving contact separates during circuit interruption. When contacts open, an electric arc forms between them in the vacuum environment, which is extinguished at current zero due to the rapid dielectric recovery of vacuum. The fixed contact's geometry and material properties help control arc movement and ensure efficient current interruption.

Materials

Copper-chromium (CuCr) alloy (typically 75/25 or 50/50 composition), oxygen-free high conductivity copper base with chromium dispersion for arc resistance and current carrying capacity.

Technical Parameters

Contact Force 200-800 N
Current Rating 630-3150 A
Voltage Rating 7.2-36 kV
Electrical Life 10,000-30,000 operations
Mechanical Life 30,000-100,000 operations
Contact Diameter 40-120 mm

Standards

IEC 62271-100, IEEE C37.04, GB/T 1984

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Fixed Contact.

Parent Products

This component is used in the following industrial products

Medium Voltage Vacuum Interrupter Module

Core vacuum switching component for medium voltage circuit breakers and contactors.

View Product Details

Engineering Analysis

Risks & Mitigation

Contact welding during fault currents
Excessive erosion reducing contact gap
Surface oxidation affecting conductivity
Mechanical misalignment causing poor contact

FMEA Triads

Trigger: Insufficient contact force
Failure: Increased contact resistance leading to overheating
Mitigation: Regular maintenance checks and proper spring calibration

Trigger: Contamination during assembly
Failure: Reduced dielectric strength and premature breakdown
Mitigation: Clean room assembly procedures and vacuum baking

Trigger: Material fatigue from repeated operations
Failure: Contact deformation affecting alignment
Mitigation: Regular inspection and replacement per manufacturer guidelines

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.05 mm for contact alignment, ±5% for contact force

Test Method

High current testing per IEC 62271-100, contact resistance measurement, X-ray inspection for internal voids

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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A precision rotating shaft in transformer winding machines that holds and rotates the coil form during wire winding operations.

Arc Plates

Arc plates are metallic plates within circuit breaker arc chutes that split and cool electrical arcs during interruption to ensure safe circuit disconnection.

Insulating Housing

Insulating housing for circuit breaker arc chutes that provides electrical isolation and thermal protection.

Frequently Asked Questions

What is the main function of a fixed contact in vacuum interrupters?

The fixed contact provides a stationary connection point for electrical current flow and helps control arc behavior during circuit interruption in vacuum environments.

Why is copper-chromium alloy used for fixed contacts?

CuCr alloy combines excellent electrical conductivity from copper with high arc resistance and low chopping current from chromium, making it ideal for vacuum interruption applications.

How does contact geometry affect performance?

Spiral or axial magnetic field contact designs help rotate the arc, preventing localized overheating and ensuring uniform contact erosion for longer service life.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Fixed Contact