Editorial Technical Reference

Industrial Electromagnetic Relay Coil Assembly

This page explains how Industrial Electromagnetic Relay Coil Assembly is classified within Manufacture of Other Electrical Equipment. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

This industrial electromagnetic relay coil assembly is a precision component designed for use in industrial control relays.

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Product Specifications

Technical details and manufacturing context for Industrial Electromagnetic Relay Coil Assembly

Definition
This industrial electromagnetic relay coil assembly is a precision component designed for use in industrial control relays. It serves as the core actuation mechanism, converting electrical signals into mechanical motion to switch contacts. The assembly is intended for applications such as automation systems, motor controls, and safety interlocks, enabling remote control of high-power circuits. It is engineered to perform consistently in demanding environments with electrical noise and vibration.

The coil assembly consists of copper magnet wire wound around a steel core, with polyamide-imide insulation and epoxy encapsulation for protection. Key parameters include a coil resistance of 100–500 Ω at 20°C, a rated voltage of 24 V DC ±10%, and power consumption of 1.5–3.0 W. Insulation resistance is at least 100 MΩ at 500 V DC per IEC 60255-5, and dielectric strength is at least 1500 V AC for one minute between coil and core. The operating temperature range is -40 to 85°C, with non-condensing humidity from 5% to 95% RH per IEC 60068-2-78. Coil inductance ranges from 50 to 200 mH at 1 kHz, and the coil diameter is 20–40 mm with a height of 15–30 mm. Wire gauge is 0.1–0.5 mm (enameled copper, class H insulation per IEC 60317), with 1000–5000 turns. Weight is 20–60 g.

These values are reference ranges for directory purposes; actual model-specific values must be confirmed with the legal manufacturer or supplier. The assembly is designed to fit standard relay sockets, but mechanical compatibility should be verified. For procurement, verify that the specific model meets your application's requirements, including electrical ratings, environmental conditions, and applicable standards. Always consult the manufacturer's datasheet and certification documents for the exact product.
Working Principle
When electrical current flows through the coil windings, it generates a magnetic field. This field attracts a movable armature, which mechanically actuates the relay contacts to open or close electrical circuits. The strength of the magnetic field depends on the current and the number of turns. The steel core concentrates the magnetic flux, enhancing the force on the armature. When the current is removed, the magnetic field collapses, and a return spring (not part of this assembly) typically resets the armature and contacts. The coil's resistance and inductance determine the electrical response time and power draw. Proper voltage and current must be applied to ensure reliable actuation without overheating.
Common Materials
Copper magnet wire, Polyamide-imide insulation, Steel core, Epoxy encapsulation
Technical Parameters
ParameterTypical rangeNotes & selection driver
Coil ResistanceRequired100–500 ΩDC resistance measured at 20°C ambient temperature
Rated VoltageRequired24 ±10% V DCNominal operating voltage for reliable actuation
Power ConsumptionRequired1.5–3.0 WMaximum power draw during continuous operation
Insulation ResistanceRequired≥100 MΩMinimum resistance between coil and core at 500V DCIEC 60255-5
Operating TemperatureRequired-40–85 °CAmbient temperature range for specified performance
Coil Inductance50–200 mHInductance measured at 1kHz with no load
Coil Diameter20–40 mmFits standard relay sockets
Coil Height15–30 mmAffects relay overall dimensions
Wire Gauge0.1–0.5 mmEnameled copper wire, class H insulationIEC 60317
Turn Count1000–5000 turnsDetermines inductance and resistance
Dielectric Strength≥1500 V ACBetween coil and core, 1 minIEC 60255-5
Weight20–60 gInfluences relay mechanical design
Humidity Range5–95 % RHNon-condensingIEC 60068-2-78

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Coil Bobbin Part
    Provides structural support and insulation for wire windings
    Material: Glass-filled polyamide
  • Magnet Wire Part
    Conducts electrical current to generate magnetic field
    Material: Enamel-coated copper
  • Ferromagnetic Core Part
    Concentrates and directs magnetic flux for efficient actuation
    Material: Low-carbon electrical steel
  • Terminal Pins Part
    Provides electrical connection points for coil wiring
    Material: Brass with tin plating
  • Encapsulation Optional Part
    Protects coil from moisture, vibration, and contaminants
    Material: Epoxy resin compound

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Industrial Electromagnetic Relay Coil Assembly.

relay solenoid coil magnetic coil assembly electromagnetic actuator coil industrial control coil

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: Coil voltage range: 6-240V DC/AC, Insulation class: F (155°C), Vibration resistance: 10-55Hz at 1.5mm amplitude
temperature: -40°C to +85°C
Media Compatibility
✓ Clean dry air environments ✓ Control cabinet installations ✓ Industrial automation panels
Unsuitable: High moisture/condensing environments without proper IP-rated enclosures
Sizing Data Required
  • Required coil voltage (V DC/AC)
  • Switching current/load rating (A)
  • Ambient operating temperature range (°C)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Coil burnout
Cause: Overvoltage, excessive current, or prolonged energization leading to thermal degradation of insulation and wire
Mechanical binding or sticking
Cause: Contamination (dust, oil, debris), corrosion, or wear on the armature pivot points and contact surfaces
Maintenance Indicators
  • Audible buzzing or chattering during operation indicating poor contact or loose connections
  • Visible discoloration, charring, or melting on the coil housing or terminals
Engineering Tips
  • Implement regular cleaning with compressed air or non-conductive solvents to prevent contamination buildup
  • Use voltage stabilizers or surge protectors to maintain consistent supply voltage within manufacturer specifications

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61810-1:2015 (Electromechanical elementary relays) UL 508 (Industrial Control Equipment) DIN EN 61810-1:2015 (Electromechanical elementary relays)

Quoted from the published standard.

Manufacturing Precision
  • Coil winding resistance: +/-5% of nominal value
  • Terminal pin alignment: +/-0.3mm from datum
Quality Inspection
  • Insulation resistance test (minimum 100 MΩ at 500 VDC)
  • Operate/release voltage test (verify within +/-10% of specified range)

Manufacturers of Industrial Electromagnetic Relay Coil Assembly

Manufacturer profiles associated with Industrial Electromagnetic Relay Coil Assembly.

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Frequently Asked Questions

What is the typical operating voltage for this coil assembly?

The rated voltage is 24 V DC with a tolerance of ±10%. This is the nominal voltage for reliable actuation. Always verify the exact voltage requirement for your specific model from the manufacturer's datasheet.

What are the insulation and dielectric strength specifications?

The insulation resistance is at least 100 MΩ at 500 V DC, and the dielectric strength is at least 1500 V AC for one minute between coil and core, both per IEC 60255-5. These are reference values; confirm with the supplier for the specific product.

Can this coil assembly be used in high-temperature environments?

The operating temperature range is -40 to 85°C. For applications outside this range, consult the manufacturer to ensure suitability. Also consider humidity limits of 5-95% RH non-condensing.

How do I verify that this coil fits my relay?

The coil diameter is 20-40 mm and height is 15-30 mm, designed to fit standard relay sockets. However, mechanical compatibility depends on the relay's design. Check the relay's specifications and the coil's dimensions with the manufacturer.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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