INDUSTRY COMPONENT

Plunger/Armature

Plunger/Armature is the moving core component in trip solenoids that converts electrical energy into linear mechanical motion for circuit interruption.

Component Specifications

Definition
The plunger/armature is a precision-machined ferromagnetic component that serves as the movable core within a trip solenoid assembly. When energized by an electrical coil, it generates electromagnetic force that moves linearly against a spring mechanism, physically actuating the trip mechanism to open electrical contacts. This component is critical for rapid, reliable circuit interruption in protection devices.
Working Principle
Operates on electromagnetic induction principles: when current flows through the solenoid coil, it creates a magnetic field that attracts the ferromagnetic plunger/armature, causing linear motion. This mechanical displacement is transferred to the trip mechanism, which opens electrical contacts to interrupt current flow. De-energizing the coil allows a return spring to reset the plunger/armature to its original position.
Materials
Typically made from low-carbon steel (AISI 1010/1018), silicon steel, or soft magnetic alloys (e.g., Permendur) with high magnetic permeability and low coercivity. Surface treatments include zinc plating, nickel coating, or phosphate coating for corrosion resistance.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Response Time<20 ms
Stroke Length2-15 mm
Operating Force5-50 N
Dimensional Tolerance±0.05 mm
Electrical InsulationClass B (130°C)
Operating Temperature-40°C to +85°C

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 4400, DIN 43650, IEC 60947-1

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Magnetic saturation reducing force output
  • Mechanical binding due to contamination
  • Corrosion affecting movement
  • Fatigue failure from cyclic loading
  • Inconsistent response due to wear
FMEA Triads
Trigger: Material contamination or improper lubrication
Failure: Mechanical binding/sticking
Mitigation: Implement cleanroom assembly, use specified lubricants, apply protective coatings
Trigger: Corrosive environment exposure
Failure: Reduced magnetic properties and increased friction
Mitigation: Apply corrosion-resistant coatings, use stainless steel variants, implement environmental sealing
Trigger: Cyclic fatigue from frequent operation
Failure: Fracture or permanent deformation
Mitigation: Use fatigue-resistant materials, implement duty cycle monitoring, design with safety factors

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.1 mm for critical dimensions, ±2% for magnetic properties
Test Method
Electromagnetic force testing per IEC 60947-1, dimensional verification with CMM, material certification to ASTM A848

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 Plunger/Armature

Manufacturer profiles associated with Plunger/Armature.

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Frequently Asked Questions

What is the difference between plunger and armature in solenoid applications?

In trip solenoids, 'plunger' typically refers to the moving core in linear motion applications, while 'armature' is more general but often used interchangeably. Both perform the same function of converting electromagnetic force to mechanical motion.

How does plunger/armature wear affect trip solenoid performance?

Wear can increase friction, reduce response speed, and cause inconsistent trip timing. Regular inspection for surface scoring, corrosion, or material fatigue is essential for maintaining reliable operation.

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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