GE Capacitor GEM III Construction Descriptive Information

CPD 512

– 03 / 07

2

GEM III Construction

GEM III Series Construction

RBC 's Gem III capacitors are manufactured with

RBC 's Gem III capacitors are manufactured with

high-grade metallized polypropylene film. This film
is in the range of 6 to 10 microns thick, depending
on the application voltage and conditions. The
metallized electrode is several hundred angstroms
thick.

The film is wound into capacitor rolls on high­speed, high-precision machines. The winding is
extremely tight so that there is not enough space
between the layers for corona (localized partial
electrical discharges) to occur. The rolls are
sprayed on both ends with metal to make
connection to the extremely thin edges of the
metalized electrodes.

The rolls are assembled in metal cases, RBC's
proprietary Dielektrol VI liquid is introduced under
vacuum, and the capacitors are sealed. They are
then subjected to 100% electrical testing for
capacitance, dissipation factor, and high potential
electrical withstand, both terminal-to-terminal and
terminal-to-case.

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Descriptive Information

high-grade metallized polypropylene film. This film is
in the range of 6 to 10 microns thick, depending on
the application voltage and conditions. The
metallized electrode is several hundred angstroms
thick.

The film is wound into capacitor rolls on high-speed,
high-precision machines. The winding is extremely
tight so that there is not enough space between the
layers for corona (localized partial electrical
discharges) to occur. The rolls are sprayed on both
ends with metal to make connection to the
extremely thin edges of the metalized electrodes.
This process is critical to the quality and
performance of the capacitors.

The rolls are assembled in metal cases, RBC's
proprietary Dielektrol VI liquid is introduced under
vacuum, and the capacitors are sealed. They are
then subjected to 100% electrical testing for
capacitance, dissipation factor, and high potential
electrical withstand, both terminal-to-terminal and
terminal-to-case.

Product Safety

A

2.00

1.00P1.62

B

2.25

1.25S1.88

C

2.50

1.62T2.38

D

3.25

1.62

*Underwriter's Laboratories

CPD 512

– 03 / 07

Pressure Sensitive Interrupter

Mounting Considerations

Cut

-

Out Clearance

3

All the capacitors listed in this publication contain
RBC's Pressure Sensitive Interrupter (PSI). This
device, developed by RBC, is designed to sense the
build-up of pressure within the capacitor if a fault
occurs and to interrupt the internal electrical
connections before the case can rupture.

The PSI carries U.L. * recognition for applications
where the specified fault currents are not exceeded.
The fault current is the maximum current that is
available from the circuit to flow through the capacitor
if the capacitor were to become a short circuit with
zero impedance. It is the responsibility of the

capacitor user to determine what the available
fault current is for a particular application.

In the Catalog Number listings a four character U.L.
Code, Pxxx, is given. This number is part of the listing
for RBC in U.L. File No. E7793. When applying to U.L.
for approvals or recognition of equipment using these
capacitors refer to the Pxxx number and not the
Catalog Number of the capacitor in question.

Proper operation of the PSI requires that the cover be
able to expand without restriction. The following
mounting considerations should be noted in mounting
these capacitors.

Vertical Clearance

There must be sufficient clearance
between the tops of the terminals (and/or
the assembled wire connectors) and a
plane perpendicular to the capacitor
terminals. This clearance must be at least

0.5 inches plus the electrical spacing
requirements of the end application.

In certain instances capacitors are mounted
with the top of the capacitor case resting
against the chassis and the terminals
protruding through the chassis. Care must
be taken to see that the cutout in the
chassis is large enough. The following
dimensions are recommended.

Case Style a b Case Style a

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