Choke Coils

A reliable source for Electric Coil information and leading Electric Coil Companies & Manufacturers.

As passive components depending on the property of self-inductance, choke coils operate based on the generation of an electromotive force (EMF) in a circuit that results from the changing of the current in that circuit. Read More…

Choke Coils Choke coils, also known as choking coils, are low-resistance electrical coils with high inductance that are used to block high-frequency alternating currents (AC) of electricity while allowing low-frequency direct currents (DC) to pass through.

Leading Manufacturers

Sag Harbor, NY  |  800-724-5952

We are proud of the craftsmanship of our engineers. All of our products are made right here in the United States and we promise that these items are created from high quality resources. Our electrical coils are unique and efficient.

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Sag Harbor Industries, Inc. $$$

Antigo, WI  |  800-826-9741

Johnson Electric Coil Company is a family owned manufacturer that specializes in custom transformers, coils and inductors. From three phase isolation transformers to single phase inductors and chokes, we carefully design our products to meet your exact specifications.

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Johnson Electric Coil Company $$$

Bristol, CT  |  860-584-0927

We are an ISO 9001:2015 certified company which is internationally known for manufacturing high quality electromagnetic-coils. It is our goal to provide quality products, a commitment to speedy delivery, and competitive pricing. We understand that every application is unique, so we encourage you to contact us to discuss your specific requirements. Call us at 1-860-584-0927 and find out what our 50+ years of experience can do for you.

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Quality Coils, Inc. $$$

Ormond Beach, FL  |  386-671-7406

Where others have failed, Standard Technology overcomes the most difficult design challenges for custom electric coils, solenoids, sensors and electromagnets. With years of experience, full engineering consulting services and in-house machine capabilities, we meet clients’ exact needs, from AC/DC coils to coil assemblies. We have produced encapsulated and over-molded coils for many industries.

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Standard Technology Inc. $$$

Binghamton, NY  |  800-224-4477

Endicott Coil Company is an expert manufacturer of an impressive range of coils. Created in wire gages of 4 AWG – 50 AWG with insulation capacities up to 220 degrees, our coil assortment consists of molded coils, custom coils, self-supported coils, encapsulated coils, inductors & ferrite core coils. As a leading electric coil manufacturer, ECC’s products are used in a wide range of applications.

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Endicott Coil Company, Inc. $$$

Yardville, NJ  |  609-585-6600

We are a dedicated manufacturer of electric coils and you will not be upset with the capabilities of our teams. All of our high performance devices are competitively priced and we can design any coil to match your unique requirements. We are a focused supplier for OEM, military, precipitator and air pollution control industries. Please give one of our representatives a call today to learn more information!

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Stonite Coil Corporation $$$
placeholder image Sag Harbor Industries, Inc. Johnson Electric Coil Company Quality Coils, Inc. Standard Technology Inc. Endicott Coil Company, Inc. Stonite Coil Corporation

Choke coils are electrical coils that work to block common-mode currents while passing differential, or equal but opposite, currents. Although they provide a very specific function, choke coils can be utilized in a broad range of applications including: power generation, in order to protect power lines from electromagnetic interference (EMI) or radio frequency interference (RFI); automotive, for use in engine applications; electronics, to protect electrical devices from EMI and RFI that could cause them to malfunction; and HVAC, for use in equipment such as furnaces, air conditioners and blowers.

There are several different types of choke coils and one of the main differences in construction between the types is the core material, which can include iron powder, ferromagnetic, non-magnetic and ferrite. What metal is chosen depends on the conductivity level desired.

Small Custom Coils Small Custom Coils - Sag Harbor Industries, Inc.

Often used in EMI and RFI interference protection applications, there are two main categories of choke coils utilized in radio circuits: audio frequency coils (A.F. chokes) and solid-state chokes (SSC), which are also known as electronic ballast or electronic chokes. A.F. chokes are, as the name suggests, designed to be used with audio frequency applications, and as a result have a core constructed from ferromagnetic iron that allows for increased induction capabilities, much like the induction coil.

Within A.F. chokes, there can be other categorizations based on how high of a frequency the choke coil is able to function with. For moderately high frequencies, A.F. chokes typically have a core constructed from iron powder or ferrite, while for very high frequencies A.F. chokes most often have a core constructed from non-magnetic cores. The non-magnetic cores could be so simple as to only require air surrounding the coil. When it comes to SSC, they are capable of operating with even higher frequencies than A.F. chokes.

In addition, SSC are capable of reducing the high noise levels typically associated with higher frequencies. Additional types of choke coils include medium frequency (MF) radio chokes, high frequency (HF) radio chokes and very high frequency (VHF) chokes.

Choke Coils Informational Video