Electronic circuit breaker ESS31-T...-DC 24 V
Description
The model ESS31-T extends our product group of electronic over-
current protection devices for DC 24 V applications. At a width of
only 12.5 mm it provides selective protection for all DC 24 V load
circuits. This is achieved by a combination of active electronic current
limitation in the event of a short circuit and overload disconnection
at typically 1.2 times rated current. The ESS31-T is track-mountable
and provides ease of installation for groups of devices with several
circuits. DC 24 V switch-mode power supplies are widely used in
automation today. In the event of an overload, however, they turn
down the output voltage which is intended to power all connected
loads. So if there is a failure in a single load of the system, the supply
voltage will break down also in all other load circuits. Not only does
this frequently cause undefined fault conditions, but it can even lead
to machine stoppages or system downtimes.
In this context selectivity means that type ESS31-T responds faster
to any overload or short circuit conditions in a load circuit than the
switch-mode power supply. This is ensured by the combination of
active electronic current limitation and well-proven circuit breaker
technology including physical isolation.
The max. possible overcurrent is limited to typically 1.2 times rated
current (see table 1). This allows switching on capacitive loads of up
to 40,000 µF, but a disconnection will only be effected in the event of
an overload or short circuit. For adjustment to the load conditions the
current rating can be selected in fixed values from 0.5 A to 12 A. Visual
status indication is by means of a multicoloured LED and by integral
signal outputs. The manual ON/OFF switch on the device itself allows
start-up of certain individual load circuits and reset after disconnec-
tion on grounds of overcurrent.
As soon as the ESS31-T detects an overload or short circuit in its
load circuit, it blocks the load output transistor and disconnects the
current flow in the faulty circuit. After remedy of the failure, the load
output of the ESS31-T is re-activated manually by actuating the ON/
OFF switch of the device.
US patent number:
US 6,490,141 B2
US patent number:
US 8,237,311 B2
ESS31-T
Technical data (T
amb
= 25 °C, U
B
= DC – 24 V)
Operating data
Operating voltage U
B
Current ratings I
N
DC 24 V (18...30 V)
fixed rating:
Types ESS31-TC-…:
0.5 A, 1 A, 2 A, 3 A, 3.6 A, 4 A,
6 A, 8 A, 10 A, 12 A
in ON condition: typically 8 mA
Standby current I
0
depending on the
signal output
Trip current (bimetal)
typically 0.4 A
(only in the event of a failure, until physical
disconnection)
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Visual status
indication
multicoloured LED:
Green:
- device is ON (S1 = ON)
load circuit connected
Orange:
- overload or short circuit until
electronic disconnection
Red:
- device switched OFF electronically
load circuit OFF
- undervoltage (U
B
< 8 V)
OFF:
- manually OFF (S1 = OFF)
load circuit physically isolated
or device is dead-voltage
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Features and Benefits
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Selective load protection with physical isolation
in the event of a failure
All types of loads can be connected
(DC 24 V motors upon request)
Active current limitation when switching on capacitive loads
up to 40,000 µF and in case of overload/short circuit
Fixed current ratings from 0.5 A to 12 A
Reliable overload disconnection typically from 1.2 x I
N
even with
long load lines or small cable cross sections
Manuel ON/OFF switch (push-push actuation)
Clear status indication by means of LED
Integral fail-safe element, adjusted to current rating
Width per channel only 12.5 mm
For direct rail mounting
Ease of wiring via entry line busbars LINE+ and 0 V
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Potential-free signal contact
On/off position of the switch S1
Approvals ESS31-TC
Approval
authority
VDE
UL
Standard
EN 60934
UL 1077
Rated voltage
DC 30 V
DC 30 V
Current ratings
0.5 A…12 A
0.5 A…12 A
power MOSFET switching output
(plus switching)
Overload and short
typically 1.2 x I
N
circuit disconnection
with active current limitation
Trip times for
see time/current characteristic
electronic disconnection
overload trip time typically 500 ms
short circuit trip time depending on
current rating (see table 1)
for physical isolation
typically 5 s
Temperature disconnection internal temperature monitoring
with physical isolation
Undervoltage
monitoring
of load output
Switch-on delay t
Start
Capacitive loads
Free-wheeling diode
with hysteresis, no reset required:
»OFF« at U
B
< 14 V
»ON« at U
B
> 17 V
typically 2 ms after each ON operation,
reset and after applying of U
B
up to 40,000 µF
external free-wheeling diode
recommended for inductive load
Load circuit
Load output
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Electronic circuit breaker ESS31-T...-DC 24 V
Technical data (T
amb
= 25 °C, U
B
= DC – 24 V)
Parallel connection of
several load outputs
Signal output
Electrical data
not allowed
Order numbering code
Type No.
ESS31
Electronic Circuit Breaker, with current limitation
Mounting
TC
rail mounting, with auxiliary contact
Version
0
with physical isolation in the event of a failure
Signal input
0
without signal input
Signal output
1
auxiliary make contact
(min. 12 V/10 mA; max. 30 V/2 A)
2
auxiliary break contact
(min. 12 V/10 mA; max. 30 V/2 A)
Operating voltage
DC 24 V
voltage rating DC 24 V
Current rating
0.5 A
1A
2A
3A
3.6 A
4A
6A
8A
10 A
12 A
ESS31 - TC - 0
0 1 - DC 24 V - 6 A
ordering example
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ESS31-TC-001/-002
potential-free auxiliary contact
max. DC 30 V / 2 A min. DC 12 V / 10 mA
Standard condition
U
B
is applied and switch S1 is ON and
LED green overload,
no short circuit
OFF condition LED off
device switched off (switch S1 is OFF)
load circuit physically isolated
no operating voltage U
B
Fault condition LED orange overload conditoins > 1.2 times rated
current until electronic disconnection
Fault condition LED red electronic disconnection upon overload,
short circuit or undervoltage
ESS31-TC-001
single signal, make contact
contact open, terminal 13-14
ESS31-TC-002
single signal, break contact
contact closed, terminal 11-12
General data
Fail-safe element
back-up fuse for ESS31-T.. not required
due to integral redundant fail-safe ele-
ment (protective element)
Terminals
LINE+ / LOAD+ / 0V
- Screw terminals max. cable cross section
M4
- flexible with wire end ferrule w/wo plastic sleeve 0.5 – 10 mm
2
- multi-lead connection (2 identical cables)
rigid / flexible
0.5 – 4 mm
2
- flexible with wire end ferrule without plastic sleeve 0.5 – 2.5 mm
2
- flexible with TWIN wire end ferrule
with plastic sleeve
0.5 – 6 mm
2
- wire stripping length
10 mm
- tightening torque (EN 60934)
1.5 – 1.8 Nm
Terminals
aux. contacts
- Screw terminals
M3
- max. cable cross section
- flexible with wire end ferrule w/wo plastic sleeve 0.25 – 2.5 mm
2
- wire stripping length
8 mm
- tightening torque (EN 60934)
0.5 – 0.6 Nm
Housing material
moulded
Mounting
symmetrical rail to EN 50022-35 x 7.5
Ambient temperature
0...+50 °C (without condensation,
cf. EN 60204-1)
-20...+70 °C
Storage temperature
Humidity
96 hrs / 95% RH 40 °C
to IEC 60068-2-78-Cab
climate class 3K3 to EN 60721
Vibration
3 g test to IEC 60068-2-6, test Fc ,
Protection class
housing IP20 EN 60529
terminals IP20 EN 60529
EMC requirements
emission: EN 61000-6-3
(EMC directive, CE logo) susceptibility: EN 61000-6-2
Insulation co-ordination 0.5 kV / pollution degree 2
(IEC 60934)
reinforced insulation in operating area
Dielectric strength
max. DC 30 V (load circuit)
Insulation resistance
> 100 MΩ (DC 500 V) between
(OFF condition)
LINE (+) and LOAD (+)
Dimensions (w x h x d)
12.5 x 80 x 83 mm (tolerances to
DIN ISO 286 part 1 IT13)
Mass
approx. 70 g
Class 2
Meets requirement for Class 2 current limitation
(ESS31-T...-0,5 A/1 A/2 A/3 A/3,6 A)
Application note
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user has to ensure that the cable cross section of the load circuit
in question complies with the current rating of the ESS31-T used.
n addition special precautions must be taken in the system or
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machine (e.g. use of a safety PLC) which reliably prevent an
automatic re-start of parts of the system (cf. Machinery Directive
2006/42/EG and EN 60204-1, Safety of Machinery). In the event
of a failure (short circuit/overload) the load circuit will be discon-
nected electronically with physical isolation of the contacts by the
ESS31-T.
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1651
Electronic circuit breaker ESS31-T...-DC 24 V
Table 1: Voltage drop, current limitation, trip times, fail-safe element, max. load current
current rating
I
N
typical voltage
drop U
ON
at I
N
active current
limitation
typically
trip
time
I
SC
typically 1)
trip
time
I
OL
typically 2)
fail-safe
element
max. load current at
100 % ON duty
T
AMB
= 40
°C
0.5 A
1A
2A
3A
3.6 A
4A
6A
8A
10 A
12 A
90 mV
100 mV
110 mV
150 mV
155 mV
160 mV
170 mV
190 mV
210 mV
220 mV
1,2 x I
N
1,2 x I
N
1,2 x I
N
1,2 x I
N
1,2 x I
N
1.2 x I
N
1,2 x I
N
1.2 x I
N
1.2 x I
N
1.2 x I
N
500 ms
500 ms
500 ms
500 ms
350 ms
280 ms
150 ms
280 ms
200 ms
110 ms
500 ms
500 ms
500 ms
500 ms
500 ms
500 ms
500 ms
500 ms
500 ms
500 ms
2A
2A
4A
6.3 A
6.3 A
6.3 A
10 A
15 A
15 A
20 A
0.5 A
1A
2A
3A
3.6 A
4A
6A
8A
10 A
12 A
T
AMB
= 50
°C
0.5 A
1A
2A
3A
3.6 A
4A
5A
7A
9A
10.8 A
Note: When mounted side-by-side without convection the devices can only carry max. 80 % of their rated current continuously
(100 % ON duty) due to thermal effect.
1) short circuit
2) overload
Effect of the ambient temperature
on the tripping characteristics
ambient temperature T [°C]
temperature factor
0
0.88
+10
0.93
+23
1.0
+30
1.04
+40
1.12
+50
1.22
Table 2: ESS31-T.. - versions
Version
Signal input
Signal output:
Signal output F (signal contact)
ESS31-...
without
control input reset input
ON/OFF +24 V
+24 V
Control IN+
RE
without
single signal single signal
make con- break con-
tact
tact
(normally
(normally
open NO) closed NC)
X
X
Status output SF
without
status
OUT
+24 V = OK
status
OUT
0 V = OK
4
→
-TC
-TC
-001
-002
X
X
X
X
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Electronic circuit breaker ESS31-T...-DC 24 V
Schematic diagram ESS31-T
Example ESS31-TC-001
Wiring diagram ESS31-TC-001-... (Example)
LINE + 1
Short circuit/ current
overload
measurement
Electronic Circuit Breaker
ESS31-TC-001-DC24V-xxA
Line (+)
DC 24 V
fail-safe
13
14
electronic control unit
A
R
sense
DC 24V
xxA
N
Y
14
XXXX
R
M
13
I>
2 LOAD +
ON / OFF
G
E
0V
3
2 LOAD+
14
13
LOAD (+)
load output
activation
89,5 OFF
83,5 ON
operating condition
green / orange / red
GND (-)
Dimensions of the ESS31-TC version
operating
area
installation area
12,5
4
A
N
Y
G
E
R
80
Phoenix label
ZBF-12
snap-on socket for
symmetrical rail
EN50022-35X7.5
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80
M
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Electronic circuit breaker ESS31-T...-DC 24 V
ESS31-T Signal inputs / outputs (wiring diagrams)
The auxiliary contacts are shown in OFF or fault condition
ESS31-TC-001-.....
without signal input
with signal output f
single singnal, make contact
ESS31-TC-002-.....
without signal input
with signal output f
single singnal, break contact
LINE + 1
LINE + 1
14
13
I>
2 LOAD +
12
11
I>
2 LOAD +
0V
3
0V
3
operating condition
13-14 closed
fault condition
13-14 open
operating condition
11-12 open
fault condition
11-12 closed
Typical time/current characteristic (T
amb
= 25 °C)
10000
trip time in seconds
1000
100
10
1
0,5
0,1
0,01
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min. 1.05 x I
N
max. 1.35 x I
N
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The overload trip time is typically 500 ms (e.g. ESS31-T-…-6 A)
The electronic current limitation typically begiins in at 1.2 x I
N
This means: under all overload conditions (independent of power
supply and load circuit resistance) typically 1.2 times rated current
is applied until disconnection. The corresponding current limitation
value I
Limit
depends on the current rating of the device I
N
.
Without the current limitation getting into effect at typically 1.2 x I
N
there would be a much higher overcurrent in the event of an over-
load or short circuit.
Reset of the circuit breaker is only possible approximately 10 sec
after tripping.
4
0
1
2
disconnection and
current limitation
typically 1.2 x I
N
trip time depends
on rated current
(see table 1)
3
...times rated current
4
5 I
K
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