Encapsulated Coils

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

Made from conductive metal wire wrapped or coiled into a specific diameter, encapsulated coils, like all electric coils, are electromagnets or magnets that are only activated to magnetism when introduced to an electrical current. Electric coils provide either movement or electric current transformation through electromagnetism. Read More…

Encapsulated Coils Encapsulated coils are electric coils that have been enclosed in a silicone rubber, polyester, liquid or thermoformed epoxy casing. Similar and sometimes synonymous to molded coils, encapsulated coils are a type of electric coil, an essential component in solenoid valves, transformers, transducers, circuits, electric motors and many electronic household appliances.

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

An outer casing is used on electric coils that require protection from harsh environmental conditions such as moisture, salt, oil or vibration; with nothing to protect delicate copper coils from the elements, an electric coil's conductivity might be easily lost. Encapsulated coils and molded coils solve this problem in overlapping ways: molded coils are enclosed in injection molded or thermoplastic coverings that seal the entire coil unit, while encapsulated coils more often use liquid or thermoformed polymer epoxies.

Encapsulated Coils Encapsulated Coils - Sag Harbor Industries, Inc.

While these two overlapping types are often the same, molded coils often refers to coils that are encased in hard, hollow thermoformed or injection molded plastic casings; encapsulated coils are often molded into liquid or thermoformed epoxies, causing the coil to become one with its casing.

Encapsulated coils often offer better protection from harsh weather, oil and vibration than molded coils, since encapsulated coils are often dipped or thermoformed into sealing liquid epoxies; epoxies like silicone rubber offer vibration protection that injection-molded casings do not. Encapsulated coils can also be heat-treated after production, a process that sinters the encapsulating plastic part with the molded coil inside, providing superior protection to the coil.

While many encapsulated and molded coils can be cost-effective alternatives to larger, more complicated structures, the tooling costs of manufacturing thermoformed or injection molded plastic casings often rise above the costs of impregnated coils, which have wire directly encased in an epoxy or laminate before it is wound; impregnated coils have no need for outer casings and therefore require little or no tooling.

Manufacturers choose molded coils, encapsulated coils, impregnated coils or custom coils, whichever best fits the application and manufacturing process at hand.

Encapsulated Coils Informational Video