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Metal Bellows Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A precision-engineered flexible metal bellows component designed specifically for medium voltage vacuum interrupter modules. It provides hermetic sealing between moving and stationary parts while maintaining electrical insulation and allowing controlled axial movement during circuit breaker operation. The bellows accommodates thermal expansion, mechanical stress, and maintains vacuum integrity throughout the operational lifecycle.

Working Principle

The metal bellows operates on the principle of controlled elastic deformation through its convoluted structure. During circuit breaker operation, it compresses and extends axially while maintaining a hermetic seal. The convolutions provide flexibility for movement while the metal construction ensures vacuum integrity and electrical isolation between contacts. It allows the moving contact to travel while preventing atmospheric gases from entering the vacuum chamber.

Materials

Stainless Steel 316L (UNS S31603) or Inconel 625 (UNS N06625) with thickness 0.1-0.3mm. Material must have high fatigue strength, excellent corrosion resistance, and low outgassing properties for vacuum applications. Electropolished finish with Ra ≤ 0.4μm to minimize particle generation.

Technical Parameters

Leak Rate ≤ 1×10⁻¹¹ Pa·m³/s
Life Cycles ≥ 30,000 operations
Spring Rate 10-50 N/mm
Vacuum Level ≤ 1×10⁻⁴ Pa
Stroke Length 8-20mm
Operating Voltage 12-40kV
Maximum Compression 30% of free length
Operating Temperature -40°C to +105°C

Standards

ISO 8573-1, DIN 28400, IEC 62271-100, ASTM F316

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Metal Bellows.

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

Fatigue failure from repeated flexing
Weld joint leakage
Material contamination affecting vacuum
Over-compression leading to permanent deformation
Electrical breakdown due to insufficient clearance

FMEA Triads

Trigger: Material fatigue from excessive cycling
Failure: Bellows rupture leading to vacuum loss
Mitigation: Implement stroke limiters, use high-cycle fatigue materials, conduct regular maintenance inspections

Trigger: Improper welding during manufacturing
Failure: Leak paths developing at weld joints
Mitigation: Use automated orbital welding with helium leak testing, implement weld procedure qualifications

Trigger: Contamination during assembly
Failure: Increased outgassing and reduced vacuum quality
Mitigation: Clean room assembly, proper handling procedures, vacuum baking before sealing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.1mm on critical dimensions, ±5% on spring rate, zero visible defects on electropolished surfaces

Test Method

Helium mass spectrometry leak testing per ISO 15848, high-potential testing at 2× rated voltage, stroke cycle testing with position monitoring, thermal cycling from -40°C to +105°C

Buyer Feedback

★★★★☆ 4.7 / 5.0 (19 reviews)

"As a professional in the Electrical Equipment Manufacturing sector, I confirm this Metal Bellows meets all ISO standards."

"Standard OEM quality for Electrical Equipment Manufacturing applications. The Metal Bellows arrived with full certification."

"Great transparency on the Metal Bellows components. Essential for our Electrical Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the primary function of metal bellows in vacuum interrupters?

The metal bellows provides hermetic sealing between moving and stationary parts while allowing controlled axial movement of contacts, maintaining vacuum integrity and electrical insulation throughout circuit breaker operations.

Why are specific materials like stainless steel 316L used for bellows?

Stainless steel 316L offers excellent corrosion resistance, high fatigue strength for repeated flexing, low outgassing properties crucial for maintaining vacuum, and compatibility with electropolishing for clean surface finish.

How does bellows design affect vacuum interrupter performance?

Proper bellows design ensures reliable sealing throughout the operational stroke, minimizes mechanical stress on welds, provides consistent spring characteristics for contact movement, and maintains electrical clearance under all operating conditions.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Metal Bellows