INDUSTRY COMPONENT

Fixed Contact

Stationary electrical contact component in medium voltage vacuum interrupters for reliable current interruption.

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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.

fixed contact vacuum interrupter medium voltage electrical contact circuit breaker CuCr contact stationary contact Fixed Contact in Electrical Equipment Manufacturing

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.

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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

Buyer Feedback

★★★★☆ 4.5 / 5.0 (38 reviews)

"Found 30+ suppliers for Fixed Contact on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Fixed Contact is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Electrical Equipment Manufacturing environments. No issues with the Fixed Contact so far."

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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.

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