Industry-Verified Manufacturing Data (2026)

Medium Voltage Vacuum Interrupter Module

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Medium Voltage Vacuum Interrupter Module used in the Electrical Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Medium Voltage Vacuum Interrupter Module is characterized by the integration of Vacuum Chamber and Moving Contact. In industrial production environments, manufacturers listed on CNFX commonly emphasize Oxygen-Free Copper construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

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Product Specifications

Technical details and manufacturing context for Medium Voltage Vacuum Interrupter Module

Definition
A hermetically sealed vacuum chamber assembly that provides arc interruption capability in medium voltage electrical distribution equipment. This critical component enables safe, reliable circuit interruption by extinguishing electrical arcs within a vacuum environment, preventing contact erosion and gas generation. It serves as the primary switching element in circuit breakers, contactors, and load break switches for industrial and utility applications. Manufacturers integrate these modules into larger switchgear assemblies for power distribution networks, substations, and industrial facilities.
Working Principle
Electrical contacts separate within a high-vacuum chamber, causing metal vapor arc plasma that quickly extinguishes due to rapid condensation on contact surfaces and chamber walls, interrupting current flow.
Common Materials
Oxygen-Free Copper, Chromium-Copper Alloy, High-Alumina Ceramic, Stainless Steel 304
Technical Parameters
  • Rated voltage for normal operation (kV) Customizable
  • Short-circuit breaking capacity (kA) Customizable
Components / BOM
  • Vacuum Chamber
    Hermetically sealed enclosure maintaining vacuum environment
    Material: High-Alumina Ceramic
  • Moving Contact
    Electrically conductive surface that separates to interrupt current
    Material: Chromium-Copper Alloy
  • Fixed Contact
    Stationary electrical contact surface
    Material: Chromium-Copper Alloy
  • Metal Bellows
    Flexible seal allowing contact movement while maintaining vacuum
    Material: Stainless Steel 304
  • Shield Assembly Optional
    Internal metallic shields to control arc plasma distribution
    Material: Oxygen-Free Copper
Engineering Reasoning
3.6-40.5 kV, 630-3150 A, 16-31.5 kA breaking capacity
Contact gap < 8 mm at 40.5 kV, vacuum pressure > 1e-3 mbar, contact temperature > 650°C
Design Rationale: Dielectric breakdown at Paschen minimum (0.75 kV/mm in vacuum), contact welding due to joule heating (R=50 μΩ), outgassing from contact materials (CuCr 25/75)
Risk Mitigation (FMEA)
Trigger High di/dt (1000 A/μs) during capacitive switching
Mode: Pre-strike arc formation before contact closure
Strategy: Controlled closing mechanism with 2 m/s contact velocity and 15° pre-strike angle
Trigger Chopping current > 5 A at current zero
Mode: Voltage escalation to 2.5× system voltage
Strategy: Low-chopping contact material (WCu 30/70) with 1500 J/g heat capacity

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Medium Voltage Vacuum Interrupter Module.

Vacuum Interrupter Vacuum Bottle Vacuum Switching Chamber medium voltage vacuum interrupter module vacuum interrupter for circuit breakers MV vacuum switching component vacuum chamber contactor module industrial vacuum interrupter specifications

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0.1 to 101.3 kPa (vacuum integrity), 0.1 to 0.5 MPa (external gas pressure)
other spec: Rated voltage: 3.6 to 40.5 kV, Rated current: 630 to 4000 A, Short-circuit breaking current: 12.5 to 63 kA, Mechanical endurance: 10,000 to 30,000 operations
temperature: -40°C to +40°C (ambient), -40°C to +105°C (storage)
Media Compatibility
✓ SF6 gas insulation ✓ Dry air insulation ✓ Solid insulation systems
Unsuitable: Corrosive or conductive dust environments
Sizing Data Required
  • Rated system voltage (kV)
  • Rated normal current (A)
  • Short-circuit breaking capacity (kA)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact erosion
Cause: Arcing during interruption causes material transfer and surface degradation, leading to increased contact resistance and potential welding
Vacuum loss
Cause: Micro-leaks in bellows or seals allowing air ingress, compromising dielectric strength and interrupting capability
Maintenance Indicators
  • Audible arcing or popping during normal operation
  • Visible discoloration or tracking marks on ceramic housing
Engineering Tips
  • Implement regular contact resistance measurements and compare against baseline to detect early erosion
  • Maintain proper contact wipe and overtravel specifications during installation to ensure consistent pressure and alignment

Compliance & Manufacturing Standards

Reference Standards
IEC 62271-100: High-voltage switchgear and controlgear - Part 100: Alternating-current circuit-breakers ANSI/IEEE C37.04: Standard Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis DIN EN 62271-100: High-voltage switchgear and controlgear - Part 100: Alternating-current circuit-breakers (German adoption of IEC 62271-100)
Manufacturing Precision
  • Contact gap: +/-0.1 mm
  • Shield concentricity: 0.05 mm TIR (Total Indicator Runout)
Quality Inspection
  • X-ray inspection for internal assembly integrity and vacuum level verification
  • High-potential (Hi-Pot) dielectric withstand test at rated voltage plus safety margin

Factories Producing Medium Voltage Vacuum Interrupter Module

Verified manufacturers with capability to produce this product in China

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✓ 92% Supplier Capability Match Found

P Procurement Specialist from United States Jan 04, 2026
★★★★★
"Reliable performance in harsh Electrical Equipment Manufacturing environments. No issues with the Medium Voltage Vacuum Interrupter Module so far."
Technical Specifications Verified
T Technical Director from United Arab Emirates Jan 01, 2026
★★★★★
"Testing the Medium Voltage Vacuum Interrupter Module now; the Rated Voltage (kV) results are within 1% of the laboratory datasheet."
Technical Specifications Verified
P Project Engineer from Australia Dec 29, 2025
★★★★★
"Impressive build quality. Especially the Rated Voltage (kV) is very stable during long-term operation."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

18 sourcing managers are analyzing this specification now. Last inquiry for Medium Voltage Vacuum Interrupter Module from Mexico (50m ago).

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Frequently Asked Questions

What is the typical breaking capacity range for medium voltage vacuum interrupter modules?

Breaking capacity typically ranges from 12.5kA to 40kA depending on the specific application and voltage rating, with higher capacities available for specialized industrial uses.

How does the vacuum pressure affect the performance and lifespan of the interrupter?

Maintaining vacuum pressure below 10^-3 Pa is critical for reliable arc extinction and long service life. Proper vacuum levels ensure dielectric strength and prevent contact oxidation during switching operations.

What maintenance is required for vacuum interrupter modules in circuit breakers?

Vacuum interrupters are maintenance-free sealed units. Regular inspection of mechanical linkages and contact wear indicators is recommended, but the vacuum chamber itself requires no servicing under normal operating conditions.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Electrical Equipment Manufacturing sector.

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