Shield Assembly: Temperature Range -40°C to +105°C

Component Specifications

Definition

A critical component in medium voltage vacuum interrupter modules designed to provide electromagnetic shielding, contain arcing phenomena, and maintain dielectric integrity during circuit interruption. It consists of multiple conductive and insulating layers arranged concentrically around the vacuum interrupter's contact system to manage electric field distribution and prevent external electromagnetic interference.

Working Principle

Operates on electromagnetic shielding principles using conductive materials to create a Faraday cage effect around the vacuum interrupter. During circuit interruption, it contains and dissipates electromagnetic energy from arcing, maintains uniform electric field distribution to prevent corona discharge, and provides thermal management through conductive heat transfer paths.

Materials

Multi-layer construction: Outer layer - Stainless steel 304/316 (0.8-1.2mm thickness), Intermediate layer - Copper mesh or foil (99.9% purity, 0.3-0.5mm), Inner layer - Ceramic insulator (Alumina Al2O3 95-99%, 3-5mm thickness), Fasteners - Stainless steel A2/A4 grade

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	0.5-2.5kg
Dimensions	Custom per interrupter size
Voltage Rating	7.2-36kV
Temperature Range	-40°C to +105°C
Dielectric Strength	>30kV/mm
Shielding Effectiveness	>40dB @ 100MHz-1GHz

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 14617-12, IEC 62271-1, IEC 62271-100, DIN EN 62271-1

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

Dielectric breakdown due to contamination
Reduced shielding effectiveness from material degradation
Thermal stress cracking in ceramic components
Corrosion in conductive layers affecting performance

FMEA Triads

Trigger: Contamination accumulation on insulating surfaces
Failure: Partial discharge leading to dielectric breakdown
Mitigation: Regular cleaning protocols and sealed assembly design

Trigger: Thermal cycling stress
Failure: Cracking in ceramic insulating layers
Mitigation: Use of thermal expansion-matched materials and stress-relief design features

Trigger: Corrosion of conductive layers
Failure: Reduced shielding effectiveness and increased contact resistance
Mitigation: Corrosion-resistant materials and protective coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm dimensional tolerance, ±5% shielding effectiveness, dielectric withstand: 1.2 x rated voltage for 1 minute

Test Method

IEC 62271-100 for dielectric tests, IEC 61000-4-3 for electromagnetic compatibility, thermal cycling per IEC 60068-2-14

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Shield Assembly

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Frequently Asked Questions

What is the primary function of the Shield Assembly in vacuum interrupters?

The primary functions are electromagnetic shielding to prevent interference, containment of arcing phenomena during circuit interruption, and maintaining dielectric integrity through controlled electric field distribution.

How does material selection affect Shield Assembly performance?

Material selection directly impacts shielding effectiveness, thermal management, and durability. Stainless steel provides structural integrity, copper offers optimal conductivity for shielding, and ceramic ensures dielectric strength and thermal stability.

What maintenance is required for Shield Assemblies?

Regular visual inspection for physical damage, cleaning of conductive surfaces to maintain contact integrity, and dielectric testing during scheduled maintenance intervals. Replacement is typically required only after visible damage or failed dielectric tests.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Shield Assembly