February 10, 2011

Film capacitors: Compact motor run capacitors  (TDK-EPC Corporation)

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  • Up to 44 percent less volume than conventional capacitors
  • Available in safety classes P0 and P2 with UL approval

TDK-EPC, a group company of the TDK Corporation, presents the EPCOS MotorCap™ DM series of highly compact motor run capacitors. The space-saving version is implemented in a new housing technology in which the capacitor windings are directly molded in plastic. This allows a significant reduction in capacitor dimensions: they are now between 24 x 43 mm and 29 x 43 mm (diameter x length). This corresponds to a volume reduction of up to 44 percent compared with conventional capacitors. In addition, the types of the MotorCap™ DM series are distinguished by their hermetically sealed housing.

The new capacitors are designed for 250 V AC with capacitances of 10 to 15 µF and for 450 V AC with capacitances of 1.2 to 6 µF. Their operating life is specified as 10,000 hours over the entire temperature range from -25 to +85 °C. All types of the MotorCap™ DM series are available in safety classes P0 and P2 and are UL-approved. Their capacitor windings are self-healing. The components are available with fast-on terminals (B32318A*, B32358A*) or wire terminals (B32317A*, B32357A*).

Capacitors of the new series are suitable for use in household appliances such as washing machines, dishwashers and refrigerators as well as in compressors, air-conditioners, pumps or awning drives. They can also be used as output filters of UPS installations.


  • Motor run capacitor: Needed to operate three-phase asynchronous motors in single-phase networks; they realize the phase shift required for this purpose.

Main applications

  • Household appliances, compressors, air-conditioning und UPS installations

Main features and benefits

  • Compact dimensions between 24 x 43 mm and 29 x 43 mm (D x L)
  • Available in safety classes P0 and P2
  • Self-healing

Key data

B32318A*, B32358A* (fast-on terminal)
Capacitances [µF] (250 V AC)10/ 12/ 15
Capacitances [µF] (450 V AC)1.2/ 2/ 2.5/ 3/ 4/ 6
B32317A*, B32357A* (wire terminal)
Capacitances [µF] (250 V AC)10/ 12/ 15
Capacitances [µF] (450 V AC)1.2/ 2/ 2.5/ 3/ 4/ 6

About TDK-EPC Corporation

TDK-EPC Corporation (TDK-EPC), a TDK group company, is a leading manufacturer of electronic components, modules and systems headquartered in Tokyo, Japan. TDK-EPC has emerged from the combination of the electronic components business of TDK and the EPCOS Group and markets its products under the product brands, TDK and EPCOS.

The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites and inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors. With this product spectrum TDK-EPC offers a broad range of products and solutions of outstanding value from a single source and focuses on demanding markets in the areas of information and communication technology and automotive, industrial and consumer electronics. The company has design and manufacturing locations and sales offices in Asia, Europe, and in North and South America.

Further information on the products can be found under www.epcos.com/motorrun

Please forward reader inquiries to marketing.communications@epcos.com