Electronic circuit breakers
in E-T-A’s ESS portfolio
Physical isolation provides unrivalled safety
E-T-A Elektrotechnische Apparate GmbH
Industriestraße 2-8
.
90518 Altdorf
GERMANY
Phone +49 9187 10-0
.
Fax +49 9187 10-397
E-Mail: info@e-t-a.de
.
www.e-t-a.de
B_ESS-Portfolio_e_191119A
Technical changes, misprints and errors reserved.
Photos: E-T-A, cover: © bannafarsai/stock.adobe.com
Technical data ESS22-T ESS30-S ESS31-T
Operating voltage DC 24 V (18 ... 32 V) DC 24V (18… 30 V) DC 24 V (18… 30 V)
Rated current 0.5 A to 10 A 0.5 A to 10 A 0.5 A to 12 A
Adjustable
l
Mounting method rail mounting plug-in type rail mounting
Overload factor 1.1 x I
N
1.2 x I
N
1.2 x I
N
Overload trip time 3s 500 ms 500 ms
Short circuit current 1.4 x I
N
1.2 x I
N
1.2 x I
N
Short circuit trip time 100 ms - 3s 150 ms - 500 ms 110 ms - 500 ms
Capacitive load 20,000µF 40,000µF 40,000µF
Ambient temperature 0 °C … +50 °C 0 °C … +60 °C 0 °C … +50 °C
Approvals
UL 1077
l l l
UL 2367
l l
UL 1310
NEC Class2
l l
IEC/EN 60934
l l l
UL 60947-4-1 listed
l
Electronic circuit breakers in E-T-A’s ESS portfolio
Technical data
+ DC 24 V
LINE +
Inverse Diode
Load
I
L
Control
Unit
0 V
PE
+
–
E-T-A’s ESS product range has an
electronic trip characteristic to ensure
optimum protection in the event of a
failure. In addition, the trip curves of the
ESS devices offer active current limitation.
It ensures limitation of the fault current to a
firmly defined value. A simple rule of thumb
for electrical planning can be defined as
follows: trip current = max. current =
current limitation factor typically 1.2
times rated current
ESS22-T: double pole protection
The ESS22-T electronic circuit breaker is
a single channel device with fixed current
ratings. It allows individual integration
into your DC 24 V power supply. Double
pole disconnection allows the use in
ungrounded IT systems to EN 60204-1.
The combination of active electronic
current limitation in the event of a short
circuit and overload disconnection
from 1.1 times rated current provides
selective and double pole protection of
the DC 24 V load circuits. The ESS22-T
is track-mountable and ensures quick
and flexible start-up for groups of
devices with several DC 24 V circuits.
Application in the following industries
l Automation
l Power plants
l Medical equipment
l Steel industry
ESS electronic circuit breakers
Equipment safety in accordance with relevant standards
Electronic circuit breakers in E-T-A’s ESS portfolio
Overview of electronic circuit breakers offering physical isolation
© Nataliya Hora/Fotolia.com
© Getty Images/iStockphoto
l Enhanced protection for your system and connected loads thanks
to physical isolation and selective disconnection
l Increases system availability through clear failure detection
and signalling
l Flexible use of the devices through a number
of international approvals
Your benefits
E-T-A’s ESS31-T combines electronic overcurrent
protection with physical isolation.
The effects a failure
such as short circuit or
overload in a load circuit
can easily be calculated
in advance and can
already be taken into
account in the planning
stage.
Meeting the requirements of
international standards is imperative in
DC 24 V applications for centralised and
decentralised control voltages.
In Germany, Europe and North America,
EC/EN 60934 and UL 1077 define
requirements of circuit breakers for
equipment protection. They ensure that
function, behaviour and reliability of circuit
breakers for equipment protection comply
with homogeneous criteria. According to
these relevant standards, physical isolation
in the event of a failure is mandatory also
for DC 24 V load circuits.
At the same time, physical isolation
in accordance with these standards
offers more advantages. In any case, it
prevents a failure-caused return supply
to the DC 24 V control voltage level
after trip or manual disconnection.
Physical isolation reliably excludes
dangerous system conditions and allows
easy trouble-shooting without residual
voltage.
All devices of E-T-A’s ESS portfolio have a
fully-fledged integral bimetal sub-assembly
or a relay. In the event of a failure this offers
genuine physical isolation of the contacts.
In the event of an overcurrent, the load
circuit is first electronically disconnected.
A few seconds later, the integral mechanical
isolating element also disconnects, thus
ensuring physical isolation.
All electronic circuit breakers for
equipment protection of the ESS
portfolio provide physical isolation and
entirely meet the requirements of IEC/
EN 60934 and UL 1077.
ESS30-S: economical and compact
The ESS30-S electronic circuit breaker
with physical isolation is a “low energy
breaker” for DC 24 V applications. It is
approved to IEC/EN 60934 and UL1077
as a circuit breaker for equipment
protection and supplementary protector
and therefore ideally suitable for the use
in centralised and decentralised power
supply units. Besides fixed and adjustable
current ratings, the ESS30-S has an NEC
Class2 approval to UL 1310 for current
ratings up to 3.6 A. The compact, plug-in
type device was designed for quick and
easy mounting on the power distribution
modules 17plus and 18plus as well as
on the SVS power distribution systems.
Application in the following industries
l Automation
l Car production
l Chemistry, oil and gas
l Power plant engineering DC 24 V
ESS31-T: ready for global use
E-T-A’s ESS31-T is a single pole,
track-mountable circuit breaker. It is
characterised by particularly low power
loss. With a single characteristic curve,
the ESS31 offers standard-compliant
protection – even with long load lines or
small cable cross sections.. The housing
of the ESS31-T features an integral
power distribution. This electronic
circuit breaker also has the NEC Class2
approval according to UL1310 as well as
UL1077 and IEC/EN 60934. This range
of approvals and the physical isolation
makes the ESS31-T the perfect selective
protection for global use.
Application in the following industries
l Automation
l Car production
l Machine construction
l Pharmaceuticals and foodstuffs