Structured Manufacturing Data (2026)

Electromagnetic Solenoid (Magnetic Trip)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Electromagnetic Solenoid (Magnetic Trip) used in the Electrical Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Electromagnetic Solenoid (Magnetic Trip) is characterized by the integration of Solenoid coil and Movable plunger. In industrial production environments, manufacturers listed on CNFX commonly emphasize Copper wire (coil) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A protective component within output circuit breakers that uses electromagnetic force to trigger instantaneous trip during short-circuit conditions.

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Product Specifications

Technical details and manufacturing context for Electromagnetic Solenoid (Magnetic Trip)

Definition
The electromagnetic solenoid (magnetic trip) is a critical safety component in output circuit breakers designed to provide instantaneous protection against short-circuit faults. It operates independently of thermal effects and responds solely to high-magnitude overcurrents, typically 3-10 times the rated current, by generating sufficient electromagnetic force to mechanically trip the breaker mechanism within milliseconds, thereby isolating the fault and preventing equipment damage or fire hazards.
Working Principle
When a short-circuit current flows through the solenoid coil, it creates a strong magnetic field that attracts a movable iron core (plunger). This electromagnetic force overcomes spring resistance, causing the plunger to strike the trip mechanism, which releases the latch and opens the breaker contacts. The trip threshold is determined by the coil design and spring tension, providing fixed instantaneous protection without time delay.
Common Materials
Copper wire (coil), Electrical steel (core), Spring steel (spring), Plastic/nylon (bobbin)
Technical Parameters
  • Magnetic trip current setting (typically 3x, 5x, 10x of rated current) (A) Per Request
Components / BOM
  • Solenoid coil
    Generates electromagnetic field when current flows through it
    Material: Copper wire with insulation
  • Movable plunger Part
    Iron core that moves when attracted by magnetic field to trigger trip mechanism
    Material: Electrical steel
  • Return spring Part
    Returns plunger to reset position after trip and provides adjustable trip force
    Material: Spring steel
  • Bobbin Part
    Insulating structure that holds and supports the coil windings
    Material: Plastic or nylon

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Electromagnetic Solenoid (Magnetic Trip).

electromagnetic solenoid magnetic trip circuit breaker short-circuit protection instantaneous trip solenoid coil magnetic trip component electrical equipment solenoid plunger return spring

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Output Circuit Breakers
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Max continuous current: 100A, Trip threshold: 5-20x rated current, Insulation class: F (155°C)
temperature: -40°C to +85°C
Media Compatibility
✓ Dry air environments ✓ Clean electrical panels ✓ Non-corrosive industrial atmospheres
Unsuitable: High moisture/condensing environments
Sizing Data Required
  • Rated circuit current (A)
  • Required trip threshold multiple (x rated current)
  • Available mounting space/clearance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Coil Burnout
Cause: Excessive current due to voltage spikes, prolonged energization beyond duty cycle, or insulation degradation from overheating.
Mechanical Binding or Sticking
Cause: Contamination (dust, debris, or corrosion) on the plunger or bore, or wear/fatigue of the plunger spring leading to misalignment.
Maintenance Indicators
  • Audible humming or buzzing when energized, indicating improper seating or armature movement.
  • Visible signs of overheating such as discoloration, melting, or burning on the coil housing.
Engineering Tips
  • Implement regular cleaning and inspection schedules to prevent contamination buildup in the plunger mechanism and ensure proper lubrication if specified by the manufacturer.
  • Use surge protection devices and ensure the solenoid operates within its rated voltage and duty cycle to prevent electrical overstress and thermal degradation.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems IEC 61810-1 - Electromechanical elementary relays EN 60947-5-1 - Low-voltage switchgear and controlgear
Manufacturing Precision
  • Bore diameter: ±0.01mm
  • Coil winding resistance: ±5% of nominal value
Quality Inspection
  • Pull-in voltage test at specified temperature range
  • Insulation resistance test (minimum 100 MΩ at 500VDC)

Factories Producing Electromagnetic Solenoid (Magnetic Trip)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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

How does an electromagnetic solenoid provide magnetic trip protection?

The electromagnetic solenoid creates a magnetic field when current flows through its copper coil. During a short-circuit, the sudden current surge generates sufficient electromagnetic force to pull the movable plunger, mechanically triggering an instantaneous trip in the circuit breaker.

What materials are used in electromagnetic solenoid construction?

Key materials include copper wire for the coil (ensuring efficient conductivity), electrical steel for the core (providing magnetic permeability), spring steel for the return spring (ensuring reliable reset), and plastic/nylon for the bobbin (offering electrical insulation and structural support).

What are the main components in a magnetic trip solenoid BOM?

The bill of materials typically includes the bobbin (structural base), movable plunger (triggering component), return spring (reset mechanism), and solenoid coil (electromagnetic element). These components work together to detect short-circuits and initiate protective tripping.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Electrical Equipment Manufacturing.

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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