Motor Run Capacitors
Metallized polypropylene oil-filled capacitors
manufactured by Commonwealth Sprague
Capacitor, Inc. offer improved performance
and proven reliability in split phase motor,
compressor, filter, and general AC applications.
The 325P and 328P Series capacitors have
excellent capacitance stability with time and
temperature, and very low internal power
losses. The low power loss is a result of the
minimal dissipation factor of the dielectric.
The metallized polypropylene capacitor is self
healing. Any defect that occurs in the dielectric
is automatically “cleared” within
microseconds, and the capacitor continues to
function at full efficiency. The metallized
electrode evaporates around the defect allowing
full functionality of the component with
negligible capacitance loss.
Offered in AC voltage ranges from 240 Volt to
660 Volt at 60 Hertz, these capacitors are
available with capacitance values ranging from
3 to 100 µF (micro-Farads).
Metallized Polypropylene Film
The primary component of these motor run
capacitors is the metallized film. The electrode
is vacuum deposited on specially formulated
polypropylene film to create a high quality
CSCI also has led the industry in applying the
latest film advances. This capability has
allowed CSCI to lead the industry in the
development of thinner metallized films and
The Capacitor Element
The master rolls of metallized film are slit into
specific widths based on a capacitor model.
These rolls are placed on high speed, computer
controlled winding machines where the
capacitor section is wound into discrete
Once the section is wound, the ends are
completely covered with a conductive end-
spray and thermally cured to relieve any
material stresses and stabilize the capacitance
1.1 Single Capacitor Element
COMMONWEALTH SPRAGUE CAPACITOR, INC.
1560 Curran Highway, North Adams, MA 01247 413.664.4461 Fax: 413.664.0756