Electrocube RC NETWORKS SALES GUIDE
RC NETWORKS
®
INTRODUCTION TO RC NETWORKS GENERAL CONSTRUCTION
SALES GUIDE
Recent developments in electronic equipment have shown
the following trends:
Increasing demands for numerical control machines,
•
robotics and technically advanced appliances are requiring
progressive electronic technologies.
When employing integrated circuit and microcomputer
•
technology, today’s equipment is required to perform
multifunctions in limited size.
The denser the installation of components, the more
•
the components must be miniaturized and of lighter weight.
As a result, the following problems arise:
Functional limits of magnetic r elays and switches
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have narrowed due to increasing contact amperage.
Miniaturization of electronic components has reduced
•
their dielectric strength.
Circuit noise has increased as a result of the coexistence
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of signal and power lines.
Safety standards for electronic equipment and components
•
have become increasingly restrictive.
Some key factors affecting circuit performance are:
Arcing between relay and switch contacts cause pitting
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and whiskers resulting in premature contact failure.
Contact arcing results in high frequency noise and
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abnormal high voltages.
The generation of back electromotive force (EMF) is due to
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the inductance of loads present.
The occurrence of high frequency noise is the result of
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contact chatter in magnetic relays and switches.
Back EMF, due to inductance, affects Silicon Control
Rectifiers (SCRs) and Solid-State Relays (SSRs) and can result
in the breakdown of other semiconductor devices. Power line
surges must also be carefully considered. Either may be a
contributing factor in equipment malfunctions, failures and
in extreme cases of fire and/or electrical shock.
To illustrate these factors, consider that relay contact chatter
is capable of inducing oscillations of several KHz, contact
arcing frequencies of several MHz and amplitudes 10 to 20
times normal circuit voltages. Voltage surges from external
sources may approach thousands of volts.
To protect electronic equipment against costly failures
or malfunctions, Electr ocube has developed advanced
components to suppress contact arcing and filter unwanted
electrical noise.
RC Networks are easily selectable electronic components
designed to pr event or substantially minimize the
occurrence of arcing and noise generation in relay and
switch contacts.
RC Networks consist of specially designed capacitors and
resistors connected in series. Spark discharges and induced
noise are absorbed over a wide range by the accumulation
characteristic and impedance of the capacitor, while the RC
time constant delays and averages surge voltage and
oscillations.
RC Networks must have the capacity to store surge voltages
and current energy and afford protection against inductively
induced potentials. The dielectric material of Electrocube’s
capacitors, used in RC Networks, affords a very high degree of
voltage withstand strength. All resistors are non-inductive
types to insure a high degree of protection against pulse
potentials. To provide additional protection for equipment and
users, especially when these components are used in their
applications, all Electrocube RC Networks are packaged in
cases which meet or exceed the flammability requirements of
UL94VO.
SAFETY STANDARDS
Electrocube’s RC Networks are UL and ULCapproved.
Self-declaration of CE mark is available upon request.
APPLICATIONS
Protection for contacts and from noise during switching
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operations of equipment such as radio, TV, copiers,
mixers, coffee grinders, washing machines, dryers, tool
machine equipment, packaging machinery, etc.
Protection of electronic instruments during operation of
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relays, solenoids, motors, etc.
Electrical noise protection of semiconductor devices
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during control of triacs, thyristors, motors, welders,
illumination equipment, etc
CUSTOM DESIGNS
Electrocube offers many years of experience in the design
and manufacture of standard RC Networks, as well as special
units to meet customer requirements. For custom applications,
consult the factory direct to assist in the design, production
and delivery of your special needs.
1307 S. Myrtle Ave. • Monrovia, CA 91016 • TEL: (626) 301-0122 • FAX: (626) 357-8099
®
e-mail: sales@electrocube.com • Internet: www.electr
ocube.com • (IR: 9/99)
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