AC Relay Magnetic Core
Products Description
The AC relay magnetic core serves as the electromagnetic induction heart of AC contactors and relays. Unlike standard DC cores, AC cores must overcome the issue of electromagnetic attraction pulsation caused by zero magnetic flux at the current's zero-crossing point.
Our products are typically E-type or U-type pure iron magnetic cores, characterized by the following features:
Pure Iron Base Material: Manufactured from high-purity electric iron, offering exceptionally high magnetic saturation and excellent magnetic permeability.
Slotted Design: Precision slots are machined into the core surface or pole face to effectively minimize eddy current losses and facilitate the mechanical fastening of internal components via riveting.
Riveted Copper Stamping (Shading Ring/Flux-Splitting Ring): This component is the "soul" of the AC relay. We secure a copper stamping within the slot on the core's pole face using a high-strength riveting process. When alternating current flows through the coil, an induced current is generated in the copper ring, creating a phase shift; this maintains the holding force during current zero-crossings, thereby eliminating the buzzing noise and vibration typically associated with the core.
Material Advantages: A Leap in Magnetic Performance Driven by High Purity
| High-Permeability Pure Iron Core | We utilize electrical-grade pure iron (such as the DT4 series) that meets both national and international standards; this material features extremely low coercivity and exceptionally high magnetic permeability. Consequently, our Grooved Core for AC Relays generates greater electromagnetic attraction for a given coil power input, significantly reducing relay power consumption and aligning with global trends toward energy conservation and environmental sustainability. |
| T2-Grade High-Purity Copper Shading Ring | The riveted component is crafted from T2 copper, boasting a copper content of 99.9%. Its high electrical conductivity ensures smooth induced current flow, minimizing heat generation within the shading ring itself. Compared to cheaper brass or aluminum alternatives, these stamped copper parts provide a more stable magnetic-splitting effect and effectively prevent the riveted joint from loosening due to thermal expansion. |
| Corrosion and Wear Resistance | The AC Relay Core and Copper Ring undergo specialized anti-corrosion treatments (such as nickel or zinc plating). This ensures the surface remains pristine even in harsh industrial environments-such as those with high humidity or oil exposure-thereby preventing rust-induced issues like increased air gaps or mechanical jamming. |
Detailed Features
Exterior Details
The iron Core AC surface is smooth and free of burrs; slot edges feature smooth, rounded transitions; and the riveted joints of the copper stamped parts are flush and secure.
Cross-section Details
The grain structure is uniform, and the riveted cross-section shows no voids, reflecting precision craftsmanship.
Assembly Example
Fits perfectly with standard coil bobbins; the assembled unit is compact with unobstructed heat dissipation channels.
Test Reports
Magnetic performance curves, dimensional inspection reports, and material composition certificates are provided for every batch.
Application Advantages and Scenario Suitability
Industrial Control Relays
Used in PLC output modules, contactor auxiliary contacts, and intermediate relays, this product provides a stable AC Core for an industrial relay. It accommodates coils with a wide voltage range (24V–380V) and meets the mechanical and electrical lifespan requirements of IEC 60947-5-1.
01
Power Distribution Systems
Utilized in the electromagnetic drive mechanisms of circuit breaker shunt trips and undervoltage releases, the core's high magnetic permeability ensures reliable operation within 70%–110% of the rated voltage, thereby safeguarding power distribution.
02
Machine Tools and Automation Equipment
In the CNC system, I/O isolation relays and internal servo drive relays, the AC Core Riveted with Copper Terminal's riveted structure withstands continuous machine vibration, ensuring long-term reliability of the coil connection.
03
HVAC Control
Used in compressor start relays and fan speed-control contactors, the Pure Iron Core for AC Relays' low-loss characteristics under AC magnetization reduce the overall thermal load on control cabinets, allowing for optimized heat dissipation design.
04
New Energy and Energy Storage
In photovoltaic inverter auxiliary power relays and energy storage system BMS relays, the core's stability across a wide temperature range (-40°C to +130°C) makes it suitable for the harsh environments found in outdoor installations and enclosed compartments.
05
contact us
If you are developing projects involving AC control relays, electromagnetic relays, or industrial control components, we can provide tailored engineering solutions for Soft Magnetic AC Relay Cores based on your drawings, performance specifications, and application environments, helping you enhance product reliability and optimize supply chain efficiency.
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