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AI Overview

Mu-metal shielding cups, cans, or enclosures are highly effective, high-permeability, nickel-iron soft magnetic alloy devices used to protect sensitive electronic components—specifically inductors and transformers—from low-frequency, low-intensity magnetic field interference. They are used to prevent EMI (electromagnetic interference) from escaping the inductor and affecting surrounding sensitive circuitry.

Key Features and Functions

High Permeability: Mu-metal works by diverting or "shunting" magnetic flux around the shielded object rather than blocking it.
Optimal for Low Frequencies: They are particularly effective against 50/60 Hz magnetic interference and static fields.
Construction: These cups are usually manufactured by deep drawing or welding, often with a final, high-temperature magnetic annealing process in a pure hydrogen atmosphere to maximize shielding performance.
Versatile Shapes: Standard shields are available in round or rectangular (5-sided) shapes, with optional lids, to fit different sizes of inductors and transformers.
Applications: They are widely used in audio transformers, power inverters, and current sensors in the audio, automotive, and power generation industries.

Saturation Limits: While effective against moderate fields, mu-metal can saturate if exposed to strong magnetic fields. In cases with very high fields, it is necessary to use a, low-permeability material (like steel) on the outside and high-permeability mu-metal on the inside.
Proximity Effect: Placing a shielding cup too close to an inductor can introduce parasitic eddy currents, essentially creating a "shorted turn" that can alter the inductor's inductance value.
Frequency Dependence: The effectiveness of these shielding cups generally decreases as the magnetic field frequency increases.
Annealing: The material is sensitive; bending or mechanical stress can degrade its magnetic properties, meaning it often requires specialized "perfection annealing" to reach maximum performance.

NiFe Based Mu Metal Shielding Cup Suppliers,Manufacturers,Factory
Shielding Tubes / Cups / Cylinders * NiFe-based Permalloy Clock Movement Stator. Made of NiFe based Permalloy, the featured clock ...
Jiangsu Hongyun Precision Industry Co., Ltd.
MuMETAL® Cans & Lids - Magnetic Shield Corporation
Mu Metal Shielding Pipe For Current Sensor Suppliers, ...
Shielding Tubes / Cups / Cylinders. ... NiFe-based Mu Metal Shielding Tube for Current Transformer. Mu Metal shielding tube is a m...
Jiangsu Hongyun Precision Industry Co., Ltd.
Toroidal Transformer Mu-Metal Shielding Enclosure MuCan
The Mu-Metal enclosure shields toroidal transformer radiation to all sides to prevent sensible parts for electromagnetic radiation...
www.don-audio.com
Quantum Computing Magnetic Shields
Most importantly we use our Perfection Annealing process as a final step to maximize the permeability at the operation temperature...
Magnetic Shield Corporation
Low Cost Magnetic + Electrical Shielding Enclosure - EEVblog
Aug 23, 2025 — They come in various sizes, such as 100 x 100 mm and 600 x 600 mm, and thickness options like 0.8 mm, 4 mm, 6 mm, and others. .. s...
EEVblog

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Web results

Shielding Tubes / Cups / Cylinders

Jiangsu Hongyun Precision Industry Co., Ltd.

https://www.hongertech.com › shielding-tubes-cups-cyl...

Jiangsu Hongyun Precision Industry Co., Ltd.

https://www.hongertech.com › shielding-tubes-cups-cyl...

Mu Metal Shielding case is a major protecting method in magetic fields, which obtains double actions: one is to prevent or reduce the electromagnetic ...Read more

CE Certification NiFe Based Mu Metal Shielding Cup Supplier ...

permalloy.com

https://www.permalloy.com › Products

permalloy.com

https://www.permalloy.com › Products

Discover NiFe-based mu-metal shielding cups from Ironcore Technology Co., Ltd. Improve your electromagnetic protection with our high-quality solutions.

MuMETAL® Cans & Lids

Magnetic Shield Corporation

https://www.magnetic-shield.com › mumetal-cans-lids-r...

Magnetic Shield Corporation

https://www.magnetic-shield.com › mumetal-cans-lids-r...

We offer a wide range of standard MuMETAL® Shielding Cans in either ROUND or RECTANGULAR shapes. All MuCans are 5-sided and most sizes offer optional Lids.Read more

Missing: ~~Cup~~ ‎~~Inductors~~

Low Cost Magnetic + Electrical Shielding Enclosure

EEVblog

https://www.eevblog.com › forum › metrology › low-c...

EEVblog

https://www.eevblog.com › forum › metrology › low-c...

Aug 23, 2025 — Planning on creating my own custom magnetic + electrical shielding enclosure to perform more metrology-grade measurements.Read more

shielding signal inductors?

Dec 9, 2024

Mu-Metal for shielding RF

Nov 22, 2020

More results from www.eevblog.com

Missing: ~~Cup~~ ‎| Show results with: Cup

MuMETAL | K&J Magnetics Blog

K&J Magnetics

https://www.kjmagnetics.com › blog › mumetal

K&J Magnetics

https://www.kjmagnetics.com › blog › mumetal

Mu-METAL is an alloy of nickel and iron used for magnetic shielding. You can find it inside many electronic devices, from hard drives to CRT televisions.Read more

Missing: ~~Inductors~~ ‎| Show results with: Inductors

Toroidal Transformer Mu-Metal Shielding Enclosure MuCan

don-audio.com

https://www.don-audio.com › Trafo shielding

don-audio.com

https://www.don-audio.com › Trafo shielding

The Mu-Metal enclosure shields toroidal transformer radiation to all sides to prevent sensible parts for electromagnetic radiation noise. MuCan is designed to ...Read more

$137.70In stock$14.95 delivery14-day returns

Missing: ~~Cup~~ ‎| Show results with: Cup

Mu Metal Shielding Caps Manufacturers ...

Jiangsu Hongyun Precision Industry Co., Ltd.

https://www.hongertech.com › mu-metal-shielding-caps...

Jiangsu Hongyun Precision Industry Co., Ltd.

https://www.hongertech.com › mu-metal-shielding-caps...

Mu Metal Shielding Cups are usually manufactured by deep drawing or as a welded part. They are then given a final magnetic annealing.Read more

Mu metal - The Classic Speaker Pages Discussion Forums

The Classic Speaker Pages

https://community.classicspeakerpages.net › ... › News

The Classic Speaker Pages

https://community.classicspeakerpages.net › ... › News

Jul 28, 2000 — mu-metal is usually used to shield transformers or tape heads. The BEST method is to move the offending magnetic source away from CRT's. Another ...Read more

Missing: ~~Cup~~ ‎| Show results with: Cup

Mu-Metal Magnetic Shielding

Aircraft Spruce

https://www.aircraftspruce.com › elpages › edmomumetal

Aircraft Spruce

https://www.aircraftspruce.com › elpages › edmomumetal

MuMetal® foil is designed for use in low intensity fields where the highest attenuation and permeability µ(Mu) and highest shielding efficiency are desired.Read more

$7.50In stock$27.24 delivery30-day returns

MuMetal Shielding: Magnetic Field Protection Explained

Domadia

https://domadia.net › understanding-mu-metal-shielding...

Domadia

https://domadia.net › understanding-mu-metal-shielding...

Dec 14, 2024 — The mumetal shield is recognized as a premier high-permeability alloy, primarily composed of approximately 77% nickel, 15% iron, and enhanced ...Read more

Search Results

Web results

Shielding Tubes / Cups / Cylinders

CE Certification NiFe Based Mu Metal Shielding Cup Supplier ...

MuMETAL® Cans & Lids

Low Cost Magnetic + Electrical Shielding Enclosure

MuMETAL | K&J Magnetics Blog

Toroidal Transformer Mu-Metal Shielding Enclosure MuCan

Mu Metal Shielding Caps Manufacturers ...

Mu metal - The Classic Speaker Pages Discussion Forums

Mu-Metal Magnetic Shielding

MuMetal Shielding: Magnetic Field Protection Explained

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