An Introduction to E-T-A Circuit Protection
Manual Trip / On-Off Switches
Dual Control
Many models are available with a manual trip feature, either standard
or as an option.
Thermal-magnetic circuit breakers inherently have two separate
protection elements: the thermal circuit for overload sensing and the
magnetic coil for abnormal conditions such as short circuits. The main
contacts are in series. Electrical separation of the thermal and the
magnetic elements enables independent monitoring of two separate
signals – Dual Control – by just one single pole circuit breaker.
Others are specifically designed as combined switch/circuit breakers
with rocker, push button, or toggle actuation, styled for front panel
mounting. Rocker types are available with illumination as an option.
According to IEC 934/EN 60934:
0
R = manual reset only
M = with manual release but not intended for frequent use as a switch
S = combined switch/CBE function
E-T-A Circuit Breakers with Advanced Features
Terminals
Most models are offered with either quick connect (also suitable for
soldering)orscrewterminals. Modelswithprintedcircuitboardpinsare
also available.
● Nuisance-free operation when subject to high in-rush currents or
transients, allowingratingstobecloselymatchedtotheneedsofthe
system and enabling the most efficient sizing of wiring and
components.
● Wide selection of time/current operating characteristics ensure
tailoring to many different applications.
● Quality design ensures resistance to premature failure through
corrosion, fatigue, shock or vibration.
● Unlike fuses, no need for spares. Risks of using temporary
inappropriate substitutes are eliminated, and warranty costs are
reduced.
● Convenient resetting reduces down-time and service repair costs.
● Many types also function as on/off switches, simplifying installation
- fewer components result in higher overall reliability.
● Internationally approved, avoiding the need for different models for
different national standards.
Auxiliary Contacts
Electrically separate low current contacts can be included for use with
alarm and control switching circuits.
● Positive physical interruption of the circuit is ensured. There is no
riskofequipmentremaininglive.Lowleakagecurrentsareeliminated.
N/C (Si1)
=
Normally closed contacts are open when the main
contacts are closed (break or b-contact).
Normally open contacts are closed when the main
contacts are closed (make or a-contact).
● Fail-safe if operated beyond specified performance limits. Unlike
PTC devices, such as resettable fuses, which may arc and flame;
also they require power to be removed before they can be reset.
N/O (Si 2) =
Shunt Terminal
Also available on some models: an additional, unprotected circuit tap,
switched through the main contacts.
E-T-A International
Auxiliary Contacts
Shunt Terminal
E-T-A is an international company, successful in world markets and
with offices and support personnel strategically placed around the
globe. Our product specialists will be happy to assist with the selection
of suitable products based upon a thorough evaluation of your
engineering and commercial objectives.
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Relay Trip
Dual Control
>
I
>
I
Relay Trip
An overload sensing circuit electrically separate from the switching
contacts is a further possibility on some models.
7
Issue C
Germany (0 91 87) 10-0 - USA (847) 827-7600 - UK (01296) 420336 - www.etacbe.com
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