INDUSTRY COMPONENT

Coil Bobbin

Coil bobbin is a cylindrical or spool-shaped component that provides structural support and insulation for electromagnetic relay coils, ensuring precise winding and electrical isolation.

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Component Specifications

Definition
A coil bobbin is a critical component in industrial electromagnetic relay coil assemblies, designed to hold and organize copper or aluminum wire windings. It provides mechanical stability, thermal management, and electrical insulation between the coil windings and the relay's magnetic core. Typically made from high-temperature resistant polymers or ceramics, it features flanges at both ends to prevent wire slippage and maintain winding integrity under operational stresses.
Working Principle
The coil bobbin functions by providing a rigid, insulated form around which conductive wire is wound to create an electromagnetic coil. When current flows through the wire, it generates a magnetic field, and the bobbin ensures consistent coil geometry for reliable magnetic flux generation. It isolates the windings from the core and other components, preventing short circuits and maintaining electrical efficiency.
Materials
Typically made from high-temperature thermoplastics (e.g., PBT, PET, PPS), thermosetting plastics (e.g., phenolic resins), or ceramics. Materials must have high dielectric strength, thermal stability (up to 155°C or higher), and resistance to moisture and chemicals.
Technical Parameters
  • Height 15-60 mm
  • Inner Diameter 5-30 mm
  • Outer Diameter 10-50 mm
  • Flange Diameter 15-70 mm
  • Temperature Rating -40°C to 155°C
  • Dielectric Strength >10 kV/mm
  • Insulation Resistance >10^12 Ω
Standards
ISO 9001, IEC 61810, UL 94

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Coil Bobbin.

coil bobbin electromagnetic relay coil electrical insulation relay component industrial coil assembly bobbin specifications Coil Bobbin in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Industrial Electromagnetic Relay Coil Assembly

Electromagnetic coil assembly for industrial relay switching operations

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Solenoid Coil & Plunger

An electromagnetic actuator assembly consisting of a wire-wound coil and a movable ferromagnetic plunger, used to convert electrical energy into linear mechanical motion.

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Engineering Analysis

Risks & Mitigation
  • Electrical insulation failure due to material degradation
  • Mechanical deformation under thermal stress
  • Inconsistent winding leading to relay malfunction
FMEA Triads
Trigger: Material thermal degradation
Failure: Reduced dielectric strength causing short circuits
Mitigation: Use materials with higher temperature ratings and implement thermal management in design
Trigger: Improper winding tension
Failure: Coil deformation or wire breakage
Mitigation: Automate winding processes with tension control and quality checks

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1 mm on critical dimensions
Test Method
Dielectric withstand test per IEC 60243, thermal cycling per IEC 60068

Buyer Feedback

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Frequently Asked Questions

What is the primary function of a coil bobbin in a relay?

The primary function is to provide structural support and electrical insulation for the coil windings, ensuring consistent magnetic field generation and preventing short circuits.

What materials are commonly used for coil bobbins?

Common materials include high-temperature thermoplastics like PBT and PPS, thermosetting plastics such as phenolic resins, and ceramics, chosen for their dielectric strength and thermal stability.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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