INDUSTRY COMPONENT

Trip Armature

A magnetic trip armature is a critical component in circuit breakers that responds to overcurrent conditions by triggering mechanical disconnection.

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Component Specifications

Definition
The trip armature is an electromagnetic actuator within magnetic trip units of circuit breakers. It consists of a ferromagnetic core, coil assembly, and mechanical linkage that converts electrical overcurrent signals into physical movement to trip the breaker mechanism. When current exceeds predetermined thresholds, the magnetic field generated in the coil attracts the armature, which releases the latch mechanism and opens the contacts to interrupt the circuit.
Working Principle
Operates on electromagnetic attraction principle. Under normal conditions, spring tension holds the armature away from the magnetic core. When overcurrent flows through the coil, it creates a magnetic field proportional to current magnitude. Once current exceeds the trip setting, magnetic force overcomes spring tension, pulling the armature toward the core. This movement actuates the trip mechanism through mechanical linkage.
Materials
Core: Silicon steel laminations (M19/M36 grade), Armature: Low-carbon steel (AISI 1010/1018), Coil: Copper magnet wire (Class F insulation, 155°C rating), Springs: Spring steel (ASTM A228), Insulation: Nomex or equivalent (UL 94 V-0 rated)
Technical Parameters
  • Response Time <20ms at 300% overload
  • Magnetic Force 2-15N at trip point
  • Coil Resistance 0.1-5Ω depending on rating
  • Mechanical Life 10,000 operations minimum
  • Trip Current Range 10A-630A
  • Operating Temperature -25°C to +70°C
Standards
IEC 60947-2, UL 489, ISO 8820-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Trip Armature.

magnetic trip armature circuit breaker component overcurrent protection electromagnetic actuator trip unit part electrical protection device Trip Armature Trip Armature in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Magnetic Trip Unit

A protective component in circuit breakers that detects and responds to short-circuit currents using electromagnetic principles.

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Engineering Analysis

Risks & Mitigation
  • Incorrect calibration leading to nuisance tripping or failure to trip
  • Mechanical binding due to contamination or corrosion
  • Thermal damage from sustained overload conditions
  • Magnetic degradation over time affecting trip accuracy
FMEA Triads
Trigger: Coil insulation breakdown
Failure: Short circuit in coil winding
Mitigation: Use Class F or higher insulation with proper impregnation
Trigger: Spring fatigue
Failure: Inconsistent trip characteristics
Mitigation: Regular maintenance testing and replacement per manufacturer intervals
Trigger: Corrosion at pivot points
Failure: Mechanical binding preventing trip
Mitigation: Apply corrosion-resistant coatings and use sealed assemblies

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Trip current accuracy: ±10% of setting at reference temperature (23°C)
Test Method
IEC 60947-2 Annex M: Verification of tripping characteristics using calibrated current injection

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes trip armature failure?

Common failures include coil burnout from sustained overload, mechanical wear of pivot points, spring fatigue, and corrosion of magnetic surfaces.

How is trip calibration performed?

Calibration involves adjusting spring tension and air gap between armature and core using calibrated current sources to achieve precise trip thresholds.

Can trip armatures be replaced individually?

Yes, but replacement requires recalibration and verification of entire trip unit performance to maintain protection coordination.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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