Double Pole Electronic Circuit Breaker ESS22-T
Description
The electronic circuit breaker type ESS22-T extends the E-T-A product
range of electronic circuit protection for DC 24 V applications. It is a double
pole version providing physical isolation. It meets the requirements of the
machinery directive 2006/42/EC and the affiliated standard EN 60204-1
“Safety of Machinery, Electrical Equipment of Machines”, para 9.4.3.1.
The combination of active electronic current limitation in the event of a
short circuit and overload disconnection from 1.1 times rated current pro-
vides double pole selective protection of DC 24 V load systems.
DC 24 V power supplies, which are widely used in industry today, will shut
down the output in the event of an overload with the result that one faulty
load in the system can lead to complete disconnection of all loads. As well
as an unidentified failure this also means stoppage of the whole system.
ESS22-T
Through selective disconnection the ESS22-T responds much faster to
overload or short circuit conditions than the switch-mode power supply.
This is achieved by active current limitation. The ESS22-T limits the highest
possible current to typically 1.4 times the selected rated current. Thus it
is possible to switch on capacitive loads of up to 20,000 µF, but they are
disconnected only in the event of an overload or short circuit.
(T
= 25 °C, operating voltage U = DC 24 V)
Technical data
ambient
S
Operating data
Operating voltage US
Current rating IN
DC 24 V (18...32 V)
For optimal alignment with the characteristics of the application the current
rating of the ESS22-T can be selected in fixed values from 0.5 A...10 A.
Failure and status indication are by a multicolour LED and integral signal
contacts. Remote operation is possible by means of a physically isolated
control input. The manual ON/OFF button allows separate actuation of
individual load circuits.
fixed current ratings: 0.5 A, 1 A, 2 A, 3 A,
4 A, 6 A, 8 A, 10 A
Closed current I0
ON condition: typically 27 mA
with signal output: typically 37 mA
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Status indication
by means of
multicolour LED:
GREEN:
The ESS22-T, with a width of only 22.5 mm, can be snapped onto sym-
metrical rails ensuring ease of installation and saving space in control
cabinets.
- unit is ON, load circuit switched on
ORANGE:
- in the event of overload or short
circuit until disconnection
RED:
- after overload/short circuit
disconnection
- upon low voltage in ON condition
- after switch-on till the end of
the ON delay period
OFF:
- switched off by means of switch or
control input
Upon detection of overload or short circuit in the load circuit, the MOSFET
of the load output will be blocked to interrupt the current flow. In addition
the load output will be physically isolated by a mechanical switching ele-
ment. Upon failure remedy the load output of the ESS22-T is re-activated
manually by operating the ON/OFF switch on the device or optionally by
the physically isolated reset input and/or the control input.
4
US patent number: US 6,490,141 B2
- no operating voltage applied
potential-free signal contact
ON/OFF condition of switch
Features
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Double pole electronic circuit breaker with physical isolation at
Load circuit
load output
Load output
Power-MOSFET and relay switching
output with physical isolation, plus-
and minus-switching
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Double protection of “load+ path” through electronic protection
and failsafe element
Double protection of “load- path” through electronic protection and
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Overload disconnection
Short-circuit current IK
typically 1.1 x IN (1.05...1.35 x IN)
failsafe element
Selective load protection, electronic trip curve
Active current limitation for safe connection of capacitive loads up
active current limitation typically 1.4 x IN
(see table 1)
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Trip times
see time/current characteristics
typically 3 s at ILoad > 1.1 x IN
typically 100 ms…3 s at ILoad > 1.4 x IN
to 20,000 µF, DC motors and on overload/short circuit
Fixed current ratings 0.5 A...10 A
Low voltage monitoring
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Temperature disconnection internal temperature monitoring with
electronic disconnection
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Manual ON/OFF button
Physically isolated control input for ON/OFF optional
Physically isolated reset input RE optional
Clear status and failure indication through multicolour LED
Two signal contacts (break contact and make contact)
Width per unit 22.5 mm
Rail mounting
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Low voltage monitoring
OFF at typically < 16.0 V
ON at typically > 17.5 V
automatic switch ON or OFF
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Starting delay tStart
typically 0.5 sec
after every switch-on, after reset and
after applying US
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Disconnection of load circuit double pole, with physical isolation
Approvals
- manually on the breaker via ON/OFF
switch (OFF)
- after overload/short circuit disconnection
- via external control input
- at low voltage
Authority
VDE
Standard
Rated voltage
DC 32 V
Current ratings
0.5 A…10 A
EN 60934
- no operating voltage applied
UL
UL 1077
DC 30 V
0.5 A…10 A
C22.2 No 235
1646
www.e-t-a.de
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