ESS22-T Datasheet, PDF (1/4 Pages) ETAL Group – Double pole electronic circuit breaker with physical isolation at load output

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.
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.
ESS22-T
Technical data ^{(Tambient = 25 °C, operating voltage US = DC 24 V)}
Operating data
For optimal alignment with the characteristics of the application the current ^{Operating voltage US}
DC 24 V (18...32 V)
rating of the ESS22-T can be selected in fixed values from 0.5 A...10 A. Current rating I_N
Failure and status indication are by a multicolour LED and integral signal
fixed current ratings: 0.5 A, 1 A, 2 A, 3 A,
4 A, 6 A, 8 A, 10 A
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.
Closed current I₀

Status indication
ON condition: typically 27 mA
with signal output: typically 37 mA
l multicolour LED:
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.
by means of
GREEN:

- unit is ON, load circuit switched on
ORANGE:
- in the event of overload or short
Upon detection of overload or short circuit in the load circuit, the MOSFET ^{circuit until disconnection}
of the load output will be blocked to interrupt the current flow. In addition ^RED:
the load output will be physically isolated by a mechanical switching ele- ^{- after overload/short circuit}
ment. Upon failure remedy the load output of the ESS22-T is re-activated ^{disconnection}
manually by operating the ON/OFF switch on the device or optionally by ^{- upon low voltage in ON condition}
the physically isolated reset input and/or the control input.
- after switch-on till the end of
the ON delay period
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US patent number: US 6,490,141 B2
OFF:
- switched off by means of switch or
control input
Features
- no operating voltage applied

l potential-free signal contact
l Double pole electronic circuit breaker with physical isolation at
load output
l Double protection of “load+ path” through electronic protection
and failsafe element
l Double protection of “load- path” through electronic protection and
failsafe element
l Selective load protection, electronic trip curve
l Active current limitation for safe connection of capacitive loads up
to 20,000 µF, DC motors and on overload/short circuit
l Fixed current ratings 0.5 A...10 A
l Low voltage monitoring
l Manual ON/OFF button
l Physically isolated control input for ON/OFF optional
l Physically isolated reset input RE optional
l Clear status and failure indication through multicolour LED
l Two signal contacts (break contact and make contact)
l Width per unit 22.5 mm
l Rail mounting
Approvals
Authority
VDE
UL
Standard
EN 60934
UL 1077
C22.2 No 235
Rated voltage
DC 32 V
DC 30 V
Current ratings
0.5 A…10 A
0.5 A…10 A
l ON/OFF condition of switch
Load circuit
Load output Power-MOSFET and relay switching
output with physical isolation, plus-
and minus-switching
Overload disconnection typically 1.1 x I_N (1.05...1.35 x I_N)
Short-circuit current I_K active current limitation typically 1.4 x I_N
(see table 1)
Trip times see time/current characteristics
typically 3 s at I_Load > 1.1 x I_N
typically 100 ms…3 s at I_Load > 1.4 x I_N
Temperature disconnection internal temperature monitoring with
electronic disconnection
Low voltage monitoring OFF at typically < 16.0 V
ON at typically > 17.5 V
automatic switch ON or OFF
Starting delay t_Start typically 0.5 sec
after every switch-on, after reset and
after applying U_S
Disconnection of load circuit double pole, with physical isolation
- manually on the breaker via ON/OFF
switch (OFF)
- after overload/short circuit disconnection
- via external control input
- at low voltage
- no operating voltage applied
1646
www.e-t-a.de
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