Editorial Technical Reference

Magnetic Field Coil

This page explains how Magnetic Field Coil is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An electromagnetic coil designed to generate a controlled magnetic field within a vacuum circuit breaker's arc chute assembly.

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Product Specifications

Technical details and manufacturing context for Magnetic Field Coil

Definition
This product is a specialized electromagnetic component used in the arc chute assembly of medium voltage vacuum circuit breakers. Its primary function is to produce a precisely oriented magnetic field that controls and extinguishes electrical arcs during circuit interruption. When the circuit breaker opens, an arc forms between the contacts. The coil generates a magnetic field perpendicular to the arc path, which interacts with the arc plasma. This interaction applies a Lorentz force that causes the arc to rotate rapidly around the contacts. This rotation distributes thermal energy evenly across the contact surfaces, preventing localized overheating and stationary arc spots. As a result, the arc is quenched efficiently in the vacuum environment, protecting the contacts and ensuring reliable interruption. The coil is constructed with copper windings, high-temperature insulation such as polyimide film, and structural support made of stainless steel or aluminum. Key parameters include a rated voltage of 24 V DC, coil resistance of 20 Ω ±5%, magnetic field strength of 50–100 mT, operating temperature range of -40 to 85 °C, insulation resistance of ≥100 MΩ at 500 V DC (tested per IEC 60243), dielectric strength of 2.5 kV (per IEC 60243), coil wire diameter of 0.5–1.0 mm, number of turns of 200–500, coil inductance of 10–50 mH, weight of 0.5–1.5 kg, protection degree of IP54–IP65 (per IEC 60529), and insulation class H (per IEC 60085). These values are reference ranges for directory purposes and must be verified with the legal manufacturer for specific models and applications. The coil is intended for use in vacuum circuit breakers and is not a standalone product. It is essential to confirm that the coil meets the required specifications for the intended circuit breaker model and operating conditions.
Working Principle
When current flows through the coil windings, it generates a magnetic field perpendicular to the arc path. This magnetic field interacts with the arc plasma, which is a current-carrying conductor. The interaction produces a Lorentz force that causes the arc to rotate rapidly around the contacts. This rotation distributes thermal energy evenly, preventing localized overheating and stationary arc spots. The rapid rotation facilitates efficient arc quenching in the vacuum environment, aiding in rapid arc extinction and contact protection.
Common Materials
Copper (windings), High-temperature insulation (e.g., polyimide film), Stainless steel or aluminum (structural support)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Voltage24 V DCStandard coil voltage for vacuum circuit breaker operation
Coil Resistance20 ±5% ΩTolerance ensures consistent magnetic field strength
Magnetic Field Strength50–100 mTRequired for effective arc quenching
Operating Temperature Range-40–85 °CSuitable for outdoor and indoor switchgear
Insulation Resistance≥100 MΩAt 500 V DC, ensures safetyIEC 60243
Dielectric Strength2.5 kVWithstands rated impulse voltageIEC 60243
Coil Wire Diameter0.5–1.0 mmAffects resistance and current capacity
Number of Turns200–500 turnsDetermines magnetic field strength
Coil Inductance10–50 mHInfluences switching speed
Weight0.5–1.5 kgAffects mounting and handling
Protection DegreeIP54–IP65Protects against dust and water jetsIEC 60529
Insulation ClassClass HAllows operation up to 180°CIEC 60085

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

Components / BOM
  • Coil Windings Part
    Conduct current to generate magnetic field
    Material: Copper
  • Insulation Layer Part
    Prevent electrical shorts between windings and to ground
    Material: Polyimide film or ceramic
  • Terminal Connectors Part
    Provide electrical connection points to circuit breaker system
    Material: Copper alloy

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 10^-6 mbar (vacuum environment)
other spec: Max current density: 5 A/mm², Insulation resistance: >100 MΩ at 500VDC
temperature: -40°C to +85°C
Media Compatibility
✓ SF6 gas environment ✓ Vacuum (10^-3 to 10^-6 mbar) ✓ Dry air/nitrogen atmosphere
Unsuitable: Corrosive/conductive particulate environments (e.g., metal dust, salt spray)
Sizing Data Required
  • Required magnetic field strength (Tesla)
  • Available coil space dimensions (mm)
  • Power supply characteristics (VDC/Amp rating)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Insulation Breakdown
Cause: Thermal cycling and overheating leading to degradation of insulating materials, often exacerbated by voltage spikes or poor cooling.
Coil Short Circuit
Cause: Mechanical vibration causing wire abrasion or insulation damage, or contamination (e.g., metallic debris, moisture) creating conductive paths between windings.
Maintenance Indicators
  • Audible buzzing or humming louder than normal operation, indicating loose windings or arcing.
  • Visible discoloration, charring, or smoke from the coil, signaling overheating or insulation failure.
Engineering Tips
  • Implement regular thermal imaging inspections to detect hotspots early and ensure cooling systems (e.g., fans, heat sinks) are clean and functional.
  • Use vibration analysis and mounting checks to minimize mechanical stress on the coil, and apply protective coatings or enclosures to shield against contaminants.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60034-1 - Rotating Electrical Machines EN 61000-6-2 - Electromagnetic Compatibility (EMC)

Quoted from the published standard.

Manufacturing Precision
  • Coil Winding Pitch: +/- 0.5% of nominal
  • Coil Resistance: +/- 2% of specified value
Quality Inspection
  • High Potential (Hi-Pot) Test - Dielectric Strength
  • Inductance Measurement Test - LCR Meter Verification

Manufacturers of Magnetic Field Coil

Manufacturer profiles associated with Magnetic Field Coil.

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Frequently Asked Questions

What is the primary function of this magnetic field coil?

It generates a controlled magnetic field within the arc chute to rotate the electrical arc during circuit interruption, aiding in efficient arc quenching and protecting contacts.

What materials are used in the construction?

Copper windings, high-temperature insulation (e.g., polyimide film), and structural support made of stainless steel or aluminum.

What are the key electrical parameters?

Rated voltage 24 V DC, coil resistance 20 Ω ±5%, magnetic field strength 50–100 mT, coil inductance 10–50 mH, and insulation resistance ≥100 MΩ at 500 V DC.

How should I verify the specifications for my application?

The listed values are reference ranges. You must confirm model-specific values and standards with the legal manufacturer or supplier before procurement.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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