New Industry Products

Corrosion-Proof 3-Phase Capacitors Rated to 1kV

April 25, 2019 by Scott McMahan

Vishay Intertechnology, Inc. added LVAC versions to its PhMKP series of power capacitors featuring ESTAspring, the company's proprietary lever-operated spring terminal connection. The true 3-phase capacitors are comprised of three winding elements encapsulated in one aluminum casing.

Like the previously released variants, the ESTAspring reduces assembly time by 60% and increases connection reliability in high vibration applications. Typical applications for the capacitors include solar and wind power plants, solar panels and inverters, and thermal power stations.

Also like other ESTAspring connection capacitors of the PhMKP series, the new variants are completely screwless.

According to the company, this lever-operated spring-terminal enables a faster and easier connection, and the constant contact force ensures the highest level of contact reliability over the devices' entire lifetime, making them suitable for applications prone to loose connections.

Another significant advantage of ESTAspring connections is that they allow for a simple optical connection check. If the lever is closed, the device is successfully contacted.

The new members of the PhMKP series offer voltages from 230V to 1000V and provide output from 2kVar to 37.1kVar. They have a maximum terminal current of 90A.

The Vishay ESTA LVAC MKP capacitors are metalized polypropylene film capacitors with self-healing properties. The current-carrying metal layer of an MKP capacitor is vaporized onto one side of the polypropylene film.

The robust construction of the capacitors makes them corrosion proof. The front surface of tubular winding elements are joined using the metal spray method (schooping). The over-pressure tear-off fuse prevents the capacitor from bursting at the end of service life, or as a result of inadmissible electrical or thermal overloads. The capacitor is housed in a tubular aluminum container with a aluminum lid press-rolled onto it.

The current is supplied via an ESTAspring IP20 block-type safety terminal. A threaded stud (M12) at the bottom of the container serves for both grounding and mounting.

The Vishay ESTAprop and ESTAdry capacitors will be delivered together with discharge resistors and hardware for mounting.

The entire range of Vishay ESTA LVAC products are offered in both natural oil-filled ESTAprop PhMKP and gas-filled ESTAdry PhMKPg versions.

The devices are RoHS-compliant, halogen-free, UL- and cUL-approved, and Vishay Green.


  • Maintenance free
  • Reduced assembly times up to 60%
  • Vibration proof in wind power plants and during transport
  • Optical connection check: lever closed = successfully contacted
  • 2.5mm2 up to 25mm2 with wire-end sleeve
  • Defined continuous contact force through spring technology
  • Stainless steel spring
  • Corrosion proof
  • Fast and easy lever-operated wire connection
  • Copper alloy for conductor material
  • UL and cUL

Samples of the LVAC PhMKP series are available now. Production quantities are available with lead times of 10 weeks. Pricing for U.S. delivery starts at $60 per piece.