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COMMONWEALTH SPRAGUE
MOTOR RUN CAPACITOR
CATALOG
www.DataCSOheMet4MU.OcomNWEALTH SPRAGUE CAPACITOR, INC.
1560 Curran Highway, North Adams, MA 01247 413.664.4461 Fax: 413.664.0756
www.DataSheet4U.com
www.DataSheet4U.com

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COMMONWEALTH SPRAGUE CAPACITOR, INC.
1560 Curran Highway, North Adams, MA 01247 413.664.4461 Fax: 413.664.0756

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Table of Contents
Motor Run Capacitors - Description
Marking
General Specifications
Dimensional Information
Part Numbering System
Part Numbers - Single Capacitors
Dual Capacitors
Part Numbers - Dual Capacitors
General Terms and Conditions
2
4
5
8
9
10
13
14
15
Corporate Profile
Commonwealth Sprague Capacitor, Inc.
(CSCI), formerly a division of Sprague Electric
Company, has been manufacturing motor run
capacitors since the 1940’s in North Adams,
Massachusetts. Sprague has been a leading
supplier to many of the well established motor,
compressor, and HVAC manufacturers in the
industry.
Commonwealth Sprague is the only US motor
run capacitor manufacturer that metallizes its
own polypropylene film. This key attribute
allows CSCI to quickly adjust material types to
meet fluctuating market demand.
Commonwealth Sprague is dedicated to
providing high quality products built to US
standards for the international marketplace.
Continuous improvements in the design,
performance, and cost effectiveness of CSCI
capacitors are the primary reasons we have
been a premiere supplier of motor run
capacitors for over 50 years.
COMMONWEALTH SPRAGUE CAPACITOR, INC.
1560 Curran Highway, North Adams, MA 01247 413.664.4461 Fax: 413.664.0756

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Motor Run Capacitors
Description
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
metallized film.
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
smaller capacitors.
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
capacitor elements.
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
(Figure 1.1).
1.1 Single Capacitor Element
COMMONWEALTH SPRAGUE CAPACITOR, INC.
1560 Curran Highway, North Adams, MA 01247 413.664.4461 Fax: 413.664.0756

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The Dual Capacitor Element
The dual, round concentric capacitor element
(Figure 1.2) was developed in response to the
application requirements of the HVAC
industry. In a typical air conditioning (AC)
system, two motor run capacitors are required.
One capacitor is used for the fan motor (fan),
the other for the compressor (herm). CSCI
uses state-of-the-art winding technology to
wind these two capacitors into one concentric
element, resulting in a more compact package
and increased cost savings.
Construction
1.2 Dual Round Concentric Element
The Interruptible Cover Assembly
The capacitor element is housed in a steel,
aluminum, or plastic case with a cover. Both of
the metal housings use a steel cover assembly
(Figure 1.3), consisting of the cover blank,
patented single bushing terminals, and a
pressure actuated interrupter. The plastic
capacitor uses a plastic cover.
the terminals. This creates an open circuit
before allowing the case to rupture. This very
important feature prevents a potentially
dangerous catastrophic failure.
The patented single bushing terminal is
designed to provide a leak proof seal and
prevents terminal rotation.
The interrupter is a standard safety feature
found on all high quality motor run capacitors.
If the capacitor experiences a failure that
disrupts the dielectric system, internal pressure
builds up. Our pressure sensitive interrupter is
designed to internally disconnect the tabs from
1.3 Interruptible Cover Assembly - Internal View
COMMONWEALTH SPRAGUE CAPACITOR, INC.
1560 Curran Highway, North Adams, MA 01247 413.664.4461 Fax: 413.664.0756