INDUSTRY COMPONENT

Bobbin

A bobbin is a cylindrical component used in trip solenoids to hold and guide electromagnetic coil windings, ensuring proper magnetic field generation and mechanical stability.

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Component Specifications

Definition
In industrial machinery, specifically within trip solenoids, a bobbin serves as a structural core around which insulated copper wire is wound to form an electromagnetic coil. It is typically made from dielectric materials to prevent electrical short circuits and provide thermal insulation. The bobbin's design includes flanges at both ends to contain the windings and facilitate secure mounting within the solenoid assembly. Its primary functions are to maintain coil geometry, enhance magnetic efficiency by minimizing flux leakage, and protect the windings from mechanical stress and environmental factors such as moisture and vibration.
Working Principle
The bobbin operates by providing a stable, non-conductive form for coil winding in a trip solenoid. When electrical current flows through the coil, it generates a magnetic field; the bobbin ensures consistent winding density and alignment, which optimizes magnetic flux for reliable solenoid actuation. It also acts as a thermal barrier, dissipating heat from the coil to prevent overheating and maintain performance.
Materials
Typically made from thermoset plastics (e.g., phenolic resin, PBT, or nylon) for electrical insulation and durability. May include glass-filled composites for enhanced strength and heat resistance. Material specifications often require UL 94 V-0 flammability rating, dielectric strength >10 kV/mm, and operating temperature range of -40°C to 150°C.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Length20-100 mm
Coil Capacity100-1000 turns
Inner Diameter8-30 mm
Outer Diameter15-50 mm
Flange Thickness2-5 mm
Dielectric Strength>15 kV
Insulation Resistance>100 MΩ

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 9001, IEC 60085, DIN 46435

Parent Products

This component is used in the following industrial products

Trip Solenoid

Electromagnetic actuator that triggers circuit breaker disconnection when abnormal conditions are detected.

View Product Details

Solenoid Coil Assembly

Electromagnetic component that converts electrical energy into mechanical motion to actuate contactor switching

View Product Details

Transformer

An electromagnetic device that transfers electrical energy between circuits through electromagnetic induction, typically used to change voltage levels.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Electrical short circuit due to material degradation
  • Coil deformation from mechanical stress
  • Overheating leading to insulation failure
FMEA Triads
Trigger: Material cracking from thermal cycling
Failure: Loss of insulation, causing electrical short
Mitigation: Use high-temperature resistant composites and implement regular thermal inspections
Trigger: Improper winding tension during assembly
Failure: Coil misalignment, reducing magnetic efficiency
Mitigation: Adhere to specified winding protocols and use automated winding equipment
Trigger: Exposure to corrosive environments
Failure: Material degradation and reduced dielectric strength
Mitigation: Apply protective coatings and ensure environmental seals in solenoid design

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m, electrical insulation per IEC 60664
Test Method
Dielectric strength tested via high-potential (hipot) test, 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
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Bobbin

Manufacturer profiles associated with Bobbin.

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Frequently Asked Questions

What is the primary function of a bobbin in a trip solenoid?

The bobbin holds and insulates the electromagnetic coil, ensuring proper winding alignment for efficient magnetic field generation and protecting against electrical and thermal issues.

What materials are commonly used for manufacturing bobbins?

Bobbins are typically made from thermoset plastics like phenolic resin or PBT, chosen for their dielectric properties, heat resistance, and mechanical durability.

How does bobbin design affect solenoid performance?

A well-designed bobbin maintains consistent coil geometry, reduces magnetic flux leakage, and dissipates heat, leading to reliable solenoid actuation and longer service life.

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.

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