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Headline:

High Current Common Mode Chokes: Heavy-Duty Filtering for Power Lines

Sub-headline:

Engineered for demanding AC line filtering. Our LFR Series combines Heavy-Gauge Copper Wire with high-permeability cores to achieve significant inductance (2.0mH+) and superior current handling, making it the ultimate EMI Filter solution for industrial power supplies.

Key Highlights:

High Inductance & Current: Achieves 2.0mH inductance using ultra-thick 1.6mm wire, balancing excellent noise suppression with high power capacity.

Low Power Loss: The heavy-gauge winding ensures an exceptionally low DC Resistance (< 15mΩ), minimizing heat generation in High Current Common Mode Choke applications.

Robust Vertical Mount: Features a stable vertical structure to maximize board space efficiency while ensuring mechanical security.

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Reference Case Study: Model LFR4218-202MIN

Note: The specifications below are from our production model LFR4218-202MIN. This demonstrates our manufacturing capability for Heavy-Duty AC Line Filters.

Parameter	Specification (Reference Only)	Customization Range
Model P/N	LFR4218-202MIN	Custom P/N assignment available
Category	Common Mode Choke	EMI Filter / Power Line Choke
Dimensions	43.0 x 42.0 x 24.0 mm	Custom sizes (e.g., OD 20mm - 80mm)
Inductance (L)	2.0 mH Min (@1kHz)	1.0mH - 50mH (Optimized for Freq)
DCR (Resistance)	15 mΩ Max	Ultra-low DCR designs
Wire Specs	1.6mm UEW (Heavy Gauge)	Flat Wire / Litz Wire options
Core Material	Ferrite T311913	Nanocrystalline / Mn-Zn Ferrite

Engineer's Insight: The LFR4218 is designed for "Heavy Duty" filtering. By winding 1.6mm thick wire on a large T31 core, we achieve a high minimum inductance of 2.0mH without sacrificing current capability. The low DCR of 15mΩ ensures the choke runs cool even under heavy AC loads.

Tailor This Choke to Your Needs

We customize Common Mode Chokes to solve specific EMC challenges.

Optimization for Power Lines

● Impedance Tuning: We can adjust the core permeability and turn count to target specific noise frequencies. For low-frequency noise (10kHz-100kHz), we use high-permeability Mn-Zn Ferrite or Nanocrystalline cores to boost inductance.

● Wire Technology: For extremely high currents, we offer Flat Wire winding to further reduce skin effect and DCR, or Litz Wire to mitigate high-frequency losses.

Safety & Isolation

● Creepage Distance: As a safety-critical component in the AC Line Filter stage, we design the winding separation and base structure to meet UL/VDE creepage requirements.

● Insulation: We utilize Class B (130°C) or Class F (155°C) insulation systems and Varnish Impregnation to ensure long-term reliability in harsh industrial environments.

Industries We Serve

Typical applications for our High Current Common Mode Chokes.

Industrial Power:

Input filters for high-power switching power supplies (SMPS) and UPS systems.

Motor Drives:

EMI suppression in Variable Frequency Drives (VFD) and servo controllers.

Renewable Energy:

Grid-tie inverters and wind power converters.

EV Infrastructure:

High-power charging stations requiring robust EMI Filters.

Quality Assurance & Testing

Strict verification for performance and safety.

Inductance Verification: 100% tested to ensure minimum 2.0mH spec is met.
DCR Measurement: Precision checking of low resistance (Max 15mΩ) to guarantee efficiency.
Hi-Pot Test: Dielectric strength testing between windings to ensure isolation safety.
Wire Integrity: Visual check for 1.6mm wire insulation and winding uniformity.