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Genius Transformers

Advanced electromagnetic components for modern power systems. Manufacturing ferrite transformers, chokes and inductors in Pune since 2017.

Find us on

  • IndiaMART

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  • All Products
  • Ferrite Transformers
  • Common Mode Chokes
  • Drum Core Chokes
  • Power Inductors
  • Rod Core Chokes
  • Line Filters
  • Solenoid Coils
  • Air Core Inductors

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Hours

  • Monday – Saturday: 9:00 AM – 6:30 PM
  • Sunday: Closed

Contact

FactoryPlot No. 77/A, Gat No. 583, Ground Floor, Sai Tirth Niwas, Pantnagar Colony No. 1, Jadhavwadi, Chikhali, Pune - 412114, Maharashtra, India
Phone+91 90112 10377
Emailgeniustransformer@gmail.com

© 2026 Genius Transformers. All rights reserved.

Contact
  • Request a quoteSend your spec — priced in 24h
  • WhatsAppFastest reply — chat with sales
  • Call the factory+91 90112 10377
  • Email usgeniustransformer@gmail.com
Talk to an engineer
Skip to content
Genius Transformers
  • Home
  • Products
  • About
  • Contact
+91 90112 10377Get a QuoteSign In
  1. Home
  2. Products
  3. Common Mode Chokes
  4. T20

Part outline

T20 (20mm OD)
Outline of T20, drawn from its published specification.
  1. 1CoreT20 (20mm OD)
  2. 2MountingThrough-hole
  3. 3OrientationHorizontal

Construction

Ferrite Toroidal Core, Enamelled Copper Winding

Common Mode Chokes

T20

T20 toroidal choke for mid-power industrial supplies and battery chargers. Larger window allows heavier wire where the line current rules out a smaller core.

Core
T20 (20mm OD)
Type
Toroid
Mounting
THT
Inductance
1mH - 47mH
Get a QuoteWhatsApp
  • 2–3 week lead time
  • Prototype to bulk
  • Wound to your spec

How it works

Blocks the noise, passes the power

A series inductor in the supply line that somehow presents almost no impedance to the load current. The trick is winding direction — and it is easier to see than to describe.

Differential mode

Passes

FLUX CANCELS → low impedance

Load current flows out on one line and back on the other. The two fluxes are equal and opposite, so they cancel in the core — the choke is nearly invisible and your supply current is untouched.

Common mode

Blocks

FLUX ADDS → high impedance

Noise appears on both lines in the same direction at once. Now the fluxes add, the core presents its full impedance, and the noise is choked off before it reaches the mains.
Both windings share one core · current direction decides the outcome

Specification

Published figures describe the standard build. Every part is wound to order — send your exact requirement and we will confirm the specification on the quotation.

Core
T20 (20mm OD)
Type
Toroid
Mounting
THT
Inductance
1mH - 47mH
Rated Current
1.0A - 5.0A
Application
EMI Suppression

Typical applications

Toroidal and UU-core common mode chokes for EMI/RFI suppression. Used to bring switching supplies, drives and chargers into conducted-emissions compliance.

  • EMC compliance
  • Chargers
  • Drives
  • Appliances
  • Lighting
  • Medical

More Common Mode Chokes

View all 19
  • Common Mode Chokes

    EE2506 / 4P / Horizontal

    EE2506 based common mode choke, offering a low profile horizontal solution for EMI suppression.

    Inductance: 0.57mH - 47mH

    View specification
  • Common Mode Chokes

    EE2506 / 4P / Vertical

    Vertical EE2506 common mode choke, combining standard EE core geometry with line filtering capabilities.

    Inductance: 0.57mH - 47mH

    View specification
  • Common Mode Chokes

    EE3007 / 4P / Vertical

    Heavy-duty EE30/7 common mode choke for demanding power line filtering. The largest EE-core choke in the range, for line currents where a toroid of equivalent impedance would not fit the board.

    Inductance: 1mH - 68mH

    View specification

Start a project

Need T20 to a different specification?

Send your inductance, turns ratio, current rating and mechanical envelope — we will come back with a design and a price.

Request a QuoteChat on WhatsApp

Pune, Maharashtra · Replies within 24 hours

Genius Transformers

Advanced electromagnetic components for modern power systems. Manufacturing ferrite transformers, chokes and inductors in Pune since 2017.

Find us on

  • IndiaMART

Products

  • All Products
  • Ferrite Transformers
  • Common Mode Chokes
  • Drum Core Chokes
  • Power Inductors
  • Rod Core Chokes
  • Line Filters
  • Solenoid Coils
  • Air Core Inductors

Company

  • About Us
  • Contact
  • Privacy Policy
  • Terms of Use
  • WhatsApp Enquiry

Hours

  • Monday – Saturday: 9:00 AM – 6:30 PM
  • Sunday: Closed

Contact

FactoryPlot No. 77/A, Gat No. 583, Ground Floor, Sai Tirth Niwas, Pantnagar Colony No. 1, Jadhavwadi, Chikhali, Pune - 412114, Maharashtra, India
Phone+91 90112 10377
Emailgeniustransformer@gmail.com

© 2026 Genius Transformers. All rights reserved.

Contact
  • Request a quoteSend your spec — priced in 24h
  • WhatsAppFastest reply — chat with sales
  • Call the factory+91 90112 10377
  • Email usgeniustransformer@gmail.com
Talk to an engineer