EMI Filter for Industrial Systems | Specifications & Standards

Product Specifications

Technical details and manufacturing context for EMI Filter

Definition

An EMI Filter is a passive electronic component used in industrial electrical systems to suppress electromagnetic interference (EMI) that can propagate through power lines or signal cables. It serves two primary functions: protecting sensitive electronic equipment from external noise sources and containing electromagnetic emissions generated by the system itself. By doing so, it helps ensure compliance with electromagnetic compatibility (EMC) standards and supports reliable operation in demanding industrial environments.

The filter typically consists of inductors (chokes) and capacitors arranged in configurations such as π-type or T-type networks. Inductors present high impedance to high-frequency noise currents, while capacitors provide a low-impedance path to ground for such noise. Common-mode chokes address noise that appears equally on both power lines, whereas differential-mode components handle noise between lines. The filtering action relies on the magnetic properties of ferrite cores and the charge storage capability of dielectric materials.

Key parameters for selection include rated voltage (up to 250 V AC), rated current (1–60 A depending on model), operating frequency (50/60 Hz), insertion loss (≥20 dB at 1 MHz), leakage current (≤0.5 mA at 250 V AC, 50 Hz), operating temperature (-25 to 85 °C), humidity (0–95% RH non-condensing), ingress protection (IP20–IP65), dielectric strength (1500 V AC line-to-ground for 1 minute), insulation resistance (≥100 MΩ at 500 V DC), weight (0.1–2.5 kg), and dimensions (ranging from 50×30×20 mm to 200×100×80 mm). These values are reference ranges and must be verified for the specific model and application.

Standards such as IEC 60939, CISPR 17, IEC 60068-2-1, IEC 60068-2-78, and IEC 60529 are referenced for testing and verification. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The EMI filter operates by combining inductors and capacitors in specific circuit topologies, typically π-type or T-type. Inductors block high-frequency noise by presenting high impedance, while capacitors shunt noise to ground. Common-mode chokes suppress noise appearing equally on both lines, and differential-mode components address noise between lines. The physical filtering occurs through ferrite core magnetic properties and dielectric charge storage.

Common Materials

Ferrite Core, Copper Wire, Ceramic Capacitor, Metal Housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	250 V AC	Maximum continuous AC voltageIEC 60939
Rated Current	1–60 A	Depends on modelIEC 60939
Operating Frequency	50/60 Hz	Standard power line frequency
Insertion Loss	≥20 dB	At 1 MHz, typicalCISPR 17
Leakage Current	≤0.5 mA	At 250 V AC, 50 HzIEC 60939
Operating Temperature	-25–85 °C	Non-condensingIEC 60068-2-1
Humidity	0–95 % RH	Non-condensingIEC 60068-2-78
Ingress Protection	IP20–IP65	Depends on enclosureIEC 60529
Dielectric Strength	1500 V AC	Line to ground, 1 minIEC 60939
Insulation Resistance	≥100 MΩ	At 500 V DCIEC 60939
Weight	0.1–2.5 kg	Depends on current rating
Dimensions (L×W×H)	50×30×20 – 200×100×80 mm	Varies with model

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

Common Mode Choke
Suppresses electromagnetic interference that appears equally on both power lines relative to ground

Material: Ferrite core with copper windings
X-Capacitor Part
Filters differential-mode noise between line and neutral conductors

Material: Metallized polypropylene film
Y-Capacitor Part
Filters common-mode noise from line/neutral to ground

Material: Ceramic dielectric with metal electrodes
Metal Housing Optional Part
Provides electromagnetic shielding and mechanical protection

Material: Aluminum or steel alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for EMI Filter.

Applied To / Applications

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

Industrial Wireless Power Transfer Module

View system integration details

Input Filter and Rectifier

View system integration details

Manufacturers of EMI Filter

11 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Chengdu Mengsheng Electronics Co., Ltd.

Chengdu, Sichuan, CN

Also makes: Input Filter (EMC Filter)