Cosel EMI Filters | BeiLuo Distributor

About EMI Filters

EMI filters for conducted noise suppression in power systems

As an authorized distributor of Cosel, BeiLuo provides a comprehensive range of EMI Filters products. These products are widely used in industrial control, automotive electronics, consumer electronics, and communication equipment. We offer a complete product line with multiple series to meet various application requirements. All products are genuine and original, backed by professional technical support and comprehensive after-sales service.

Selection Guide: How to Choose the Right EMI Filters

Product List

4 products available

Part Number ↕	Current Rating ↕	Voltage Rating ↕	Frequency Range ↕	Attenuation ↕	Leakage Current ↕	Package ↕	Stock Status	Action
EAC-06-472	6A continuous	250VAC	150kHz - 30MHz	40dB typical at 1MHz	<0.5mA at 250VAC	-	In Stock	View Details
NAC-06-472	6A continuous	250VAC	150kHz - 30MHz	40dB typical at 1MHz	<0.5mA at 250VAC	-	In Stock	View Details
EAC-10-472	10A maximum	250VAC	150kHz to 30MHz	40dB typical	<0.5mA at 250VAC	Panel Mount	In Stock	View Details
NAC-20-472	20A maximum	250VAC	150kHz to 30MHz	35dB typical	<3.5mA at 250VAC	Panel Mount	In Stock	View Details

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Frequently Asked Questions

Why do I need an EMI filter with my power supply?

EMI filters are essential for meeting electromagnetic compatibility (EMC) requirements: Conducted emissions: Filters reduce noise conducted back to power line

Required for Class A (industrial) and Class B (residential) compliance

Typical reduction: 20-40dB in conducted frequency range. Radiated emissions: Reduced conducted noise reduces radiated noise

Helps meet radiated EMC limits

Important for sensitive applications. Power quality: Filters protect equipment from line transients

Reduce susceptibility to conducted disturbances

Improve overall system reliability. Regulatory requirements: FCC Part 15 (US), EN 55032 (Europe), VCCI (Japan)

Most countries require EMC compliance for commercial products. Cosel EMI filters are matched to their power supplies for optimal performance. Contact our FAE team for EMC design guidance.

EMI filters required for EMC compliance. Cosel filters matched to power supplies. Contact us for EMC design.

How do I select the right EMI filter rating?

Select EMI filter based on: Current rating: Match or exceed power supply input current

Include margin for inrush and peak currents

Typical: 1.5x power supply rating for safety. Voltage rating: Must exceed maximum input voltage

Standard: 250VAC for universal input supplies

Higher ratings available for special applications. Attenuation: Higher attenuation for better noise reduction

Balance performance vs size/cost

Cosel filters optimized for their power supplies. Mounting: Panel mount for chassis installation

DIN rail for control panels

PCB mount for board-level filtering. Application: General industrial: Standard filters

Medical: Medical-grade filters with low leakage

Harsh environment: Ruggedized filters. Cosel provides recommended filters for each power supply model. Contact our FAE team for filter selection.

Match current rating to power supply. Cosel provides recommended filters. Contact us for selection.

What is the difference between common mode and differential mode filtering?

EMI filters address two types of noise: Common mode noise: Present on both lines relative to ground

Filtered by common mode chokes and Y capacitors

Caused by switching transients coupling to ground

Typically higher frequency (>1MHz). Differential mode noise: Present between line and neutral

Filtered by X capacitors and differential chokes

Caused by switching current in power path

Typically lower frequency (<1MHz). Cosel EMI filters provide: Both common mode and differential mode attenuation

Balanced design for optimal performance

Safety agency approved component values

Temperature stable characteristics. The combination addresses both noise types for comprehensive EMC compliance. Check filter datasheets for attenuation curves. Contact our FAE team for filter design guidance.

Cosel filters provide both common and differential mode attenuation. Contact us for filter design.

Where should I mount the EMI filter in my system?

EMI filter mounting best practices: Location: As close to power supply input as possible

Minimize unfiltered wiring length

Keep filter and supply in same enclosure if possible. Wiring: Keep input and output leads separated

Minimize coupling between filtered and unfiltered sides

Use twisted pairs for input wiring. Grounding: Connect filter ground to chassis ground

Use short, wide ground connections

Avoid ground loops. Panel mounting: Use panel mount filters for chassis installation

Ensure good electrical contact with chassis

Consider accessibility for maintenance. DIN rail: Use DIN rail filters for control panels

Mount near power supply input

Allow space for wiring. PCB mount: Place at board edge near power entry

Keep traces short and wide

Isolate filtered and unfiltered sections. Contact our FAE team for installation guidance.

Mount close to power supply input. Separate filtered/unfiltered wiring. Contact us for installation guidance.

Can I use one EMI filter for multiple power supplies?

One EMI filter can serve multiple power supplies with considerations: Current rating: Filter must handle total input current of all supplies

Include margin for inrush (typically 1.5x total)

Example: Three 5A supplies need 22.5A filter minimum. Wiring: Keep wiring from filter to each supply short

Use equal length wires for balanced filtering

Separate input and output wiring. Performance: Single filter may not provide optimal filtering for all supplies

Individual filters typically provide better attenuation

System layout affects filter effectiveness. Cost trade-off: One large filter vs multiple smaller filters

Installation complexity vs component count

Maintenance and replacement considerations. Recommendations: Use individual filters for best performance

One filter acceptable for 2-3 small supplies

Consult filter datasheet for multi-load applications. Contact our FAE team for multi-supply filter design.

Individual filters recommended for best performance. One filter can serve 2-3 small supplies. Contact us for design.