REX12D Electronic Circuit Protector
Description
The compact and flexible all-in-one solution REX consists of several
perfectly matched components. It comprises the EM12D-T / EM12-T
supply module for the plus and minus potential via a single or double
channel REX12D-T electronic circuit protector which can be mounted
side by side in any number and the PM12-T potential extension
module for plus and minus multiplication.
The requirements regarding modern machinery and equipment are
constantly growing. System transparency, remote maintenance and
remote access are getting more and more important in international
competition. Early notification in the event of any disturbances and
a fast response to current problems will increase system availability,
save costs and improve the overall stability of the production process.
E-T-A provides the ideal solution for machine and panel builders
with the intelligent protection system comprising the REX12D circuit
protector and the EM12D interface module. The system combines
the well-proven quality of DC24V overcurrent protection with the
communication options of the IO link system. It allows complete
transparency of the DC24V power supply and provides all necessary
information for a reliable production process in this plant sector.
The new generation of REX12D electronic overcurrent protection
consists of the intelligent EM12-TIO supply module and the single
or double channel REX12D-Telectronic circuit protector which allows
modular side-by-side mounting. The modules with a width of only
12.5 mm feature push-in technology including press release buttons
and allow time-saving and maintenance-free wiring without tools.
And what is more: no additional accessories are required when
connecting the individual components electrically and mechanically.
This helps save time and money!
Benefits
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Increases machine availability through high transparency and
remote diagnosis
Saves cost – no further accessories required
Saves 50 % time through innovative and flexible mounting and
connection technology
Saves space – with a width of only 12.5 mm per channel
Provides flexibility through ease of mounting, disassembly and
modular design
Features
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Control, diagnosis and monitoring via IO link
Combination of supply modules, overcurrent protection and
power distribution
Double channel selective load protection by means of electronic
trip curve
No accessories required for connecting the components
Width per channel only 6.25 mm (2-channel)
Fixed current ratings: 1 A, 2 A, 3 A, 4 A, 6 A, 8 A and 10 A
Integral fail-safe element, adjusted to current rating
Switching capacitive loads up to 20,000 µF
Manual ON/OFF/reset momentary switch
Connection via push-in terminals including press release buttons
Approval logos and markings
Data sheet
The current data sheet is available on our website: www.e-t-a.de/d751
NEC Class2
7
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1
REX12D Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
REX12D-TAx-xxx circuit protectors
REX12D-TA1-100-DC24V-xA
1-channel
REX12D-TA2-100-DC24V-xA/xA
2-channel
Operating voltage U
B
DC 24 V (18...30 V)
Closed current I
0
REX12D-TA1 1-channel in ON condition:
typically 7 mA
REX12D-TA2 2-channal in ON condition:
typically 10 mA
Reverse polarity protection
Power failure
buffering time
Current ratings IN
REX12D-TA1
REX12D-TA2
Visual status indication
of operating condition
by multicoloured
LED:
yes
up to 10 ms
fixed ratings:
8 A, 10 A
1 A/1 A, 2 A/2 A, 3 A/3 A, 4 A/4 A, 6 A/6 A
green: - load circuit connected
green/orange
blinking: - load current warning limit
reached 50 % – 100 %
orange: - overload or short circuit until
disconnection
- circuit protector was switched
off by the superordinate control
unit LED is permanently orange
red:
- after disconnection due to
overload or short circuit
- after undervoltage release of
operating voltage in ON
condition with autoreset
Device was switched off via ON/
OFF momentary switch, or due
to lacking operating voltage or
faulty initialisation of the circuit
protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
Voltage drop in load circuit at I
N
and at I
N
70 % LINE+ and LOAD+
typically 180 mV I
N
: 70 % typically 125 mV
I
N
: 1 A
typically 110 mV I
N
: 70 % typically 80 mV
I
N
: 2 A
typically 120 mV I
N
: 70 % typically 85 mV
I
N
: 3 A
typically 130 mV I
N
: 70 % typically 90 mV
I
N
: 3A-CL2
typically 115 mV I
N
: 70 % typically 80 mV
I
N
: 4 A
typically 180 mV I
N
: 70 % typically 120 mV
I
N
: 4A-CL2
typically 170 mV I
N
: 70 % typically 110 mV
I
N
: 6 A
typically 160 mV I
N
: 70 % typically 105 mV
I
N
: 8 A
typically 180 mV I
N
: 70 % typically 120 mV
I
N
: 10 A
Operating voltage
monitoring
OFF at typically U
B
< 16.0 V
ON at typically U
B
> 19 V
hysteresis typically 2 V
with regard to low voltage with automatic
ON and OFF switching
channel 1:
channel 2:
channel 1:
channel 2:
channel 1:
channel 2:
typically 100 ms
typically 200 ms
typically 5 ms
typically 100 ms
typically 5 ms
typically 5 ms
Switch-on delay
- with power ON
- when switching on via
ON/OFF momentary
switch or
- after
undervoltage
Disconnection of load circuit - manually on the device with the
ON/OFF momentary switch
- remote control via the superordinate
control unit
- after an overload / short circuit discon-
nection with storage (no automatic reset)
- temporarily at undervoltage
- at no operating voltage
Switch on of load circuit
- momentary switch ON/OFF The circuit protector can be switched
on by the superordinate control unit or
otherwise directly on the device. These
two options are linked with AND. Switch-
on is only possible if switched on from
both positions. If the circuit protector was
switched off either by the control unit or
by the momentary switch directly on the
device, switch-on has to be effected also
from the corresponding position.
- Apply
operating voltage
Reset function
For switch-on the device has to be supplied
with operating voltage. The device re-
starts with the last stored condition.
A blocked load output (blocked by
overload / short circuit) can be reset by
the ON/OFF momentary switch or by the
superordinate control unit.
typically <1 mA
up to 20,000 µF:
depending on: cable attenuation, power supply used,
load current and current rating
OFF:
Load circuit
Load output
Load current –
warning limit (I
WLimit
)
hysteresis
Overload current
disconnection (I
OL
)
with trip times (t
OL
)
short circuit
trip time (t
SC
)
power MOSFET switching output
(plus switching)
typically 0.5 – 1.0 x I
N
(parameterisable)
typically 5 %
typically I
OL
: I
N
x 1.05 t
OL
: 3s
typically I
OL
: I
N
x 1.35 t
OL
: 0.5,5s
typically I
OL
: I
N
x 2.00 t
OL
: 0.1s
typically I
OL
: I
N
x 2.50 t
OL
: 0.012 s
typically at short circuit (I
SC
) t
SC
: 0.002 s1)
see time/current characteristic
1) depending on the power source
Note:
Selection of current rating of the circuit protector
≤ rating of power supply
Influence of ambient
see temperature factor table
temperature on
overload disconnection
and load current – warning limit
Continuous Current IC
typically 0.8 x I
N
(Fail Safe Element is protected by REX12)
Fail-safe element
(integral
blade fuse
adjusted to
related current rating I
N
)
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
1 A/1 A
2 A/2 A
3 A/3 A
3A/3A-CL2
4 A/4 A
4A/4A-CL2
6 A/6 A
8A
10 A
fail-safe I
N
: 1 A / 1 A
fail-safe I
N
: 2 A / 2 A
fail-safe I
N
: 3.15 A / 3.15 A
fail-safe I
N
: 4 A / 4 A
fail-safe I
N
: 4 A / 4 A
fail-safe I
N
: 4 A / 4 A
fail-safe I
N
: 6.3 A / 6.3 A
fail-safe I
N
: 8 A
fail-safe I
N
: 10 A
Leakage current in load
circuit in OFF condition
Capacitive loads
Free-wheeling diode
Parallel connection of
several load outputs
Terminals
Push-in terminal PT 2.5
Stripping length
Dimensions (w x h d)
external free-wheeling circuit at inductive
load (rating according to load)
not allowed
LOAD+
0.14 mm
2
... 2.5 mm
2
, flexible
AWG24 – AWG14 rigid
8 mm ... 10 mm
12.5 x 98.5 x 80 mm
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Mass
REX12D-TA1-xxx 1-channel approx. 58 g
REX12D-TA2-xxx 2-channel approx. 62 g
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1802
REX12D Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
General data
Housing material
Mounting
Ambient temperature
Storage temperature
Mounting temperature
Humidity
Corrosion only PM
and EM accessories
Vibration
Degree of protection
operating area REX12
REX / EM / PM
moulded
symmetrical rail to EN 60715-35x7.5
-25 °C...+60 °C (without condensation,
cf. EN 60204-1)
-40 °C ... +70 °C
+5° ... +60 °C
96 hrs / 95 % RH/40 °C to IEC 60068-2-
78-Cab climate class 3K3 to EN 60721
96hrs. in 5% salt mist to
IEC 60068-2-11 test Ka
3g test to IEC 60068-2-6, test Fc
IEC 60529, DIN VDE 0470
IP30
Ordering number code
Type
REX12D
intelligent electronic circuit protector with PT connection technology
Mounting method
T
rail mounting
Design
A
1 load output terminal per channel, fixed current ratings xA
or xA/xA
Number of channels
1
1 channel
2
2 channels
Version
1
without physical isolation
Signal input
0
without signal input
Signal output
0
without signal output
Operating voltage
DC 24 V
voltage rating DC 24 V
Current rating range
8 A (only 1 channel)
10 A (only 1 channel)
1 A / 1 A (only 2 channels, Class2)
2 A / 2 A (only 2 channels, Class2)
3 A/3 A (only 2 channels)
4 A/4 A (only 2 channels)
6 A/6 A (only 2 channels)
Approval
CL2 Class2
(only for 3A and 4A versions)
REX12D-T
REX12D-T
A
A
1- 1
2- 1
0
0
0 - DC24V - 10A
example 1 channel
terminal area
EM, PM:
IP20
EMC requirements
noise emission
EN 61000-6-3
(EMC directive, CE logo) susceptibility:
EN 61000-6-2
Insulation co-ordination
(IEC 60934)
0.5 kV / pollution degree 2
max. DC 30 V (load circuit)
Dielectric strength
n/a, only electronic disconnection
Insulation resistance
(OFF condition)
Modules to be mounted side-by-side
REX12D-TA1-xxx 1-channel
REX12D-TA2-xxx 2-channel max.16 channels
Conformity
CE marking
0 - DC24V - 4A/4A-CL2
example 2 channels
Overview of ordering number codes
Supply
module
EM12D-TIO-000-DC24V-40A
REX12D-TA1-100-DC24V-8A
REX12D-TA1-100-DC24V-10A
REX12D-TA2-100-DC24V-1A/1A (Class2)
REX12D-TA2-100-DC24V-2A/2A (Class2)
REX12D-TA2-100-DC24V-3A/3A
REX12D-TA2-100-DC24V-3A/3A-CL2 (Class2)
REX12D-TA2-100-DC24V-4A/4A
REX12D-TA2-100-DC24V-4A/4A-CL2 (Class2)
REX12D-TA2-100-DC24V-6A/6A
EM12-T00-100-LINE-40A
EM12-T00-200-LINE-40A
EM12-T00-000-GND-40A
EM12-T00-300-GND-40A
PM12-T01-00-LOAD-20A
PM12-T02-00-LOAD-20A
PM12-T03-00-GND-20A
Approvals and standards
Approval
authority
UL
UL
UL
Standard
UL 2367
UL 1310
NEC Class2
cULus508listed
UL file
no.
E306740
E306740
E492388
Voltage
rating
DC 24 V
DC 24 V
DC 24 V
Current
rating range
1 A…10 A
1 A, 2 A,
3 A, 4 A
1 A…10 A
Circuit
protectors:
1-channel
Protection
modules:
2-channel
PM and EM – accessories approvals see technical data of accessories
Notes
The intelligent EM12D-TIO supply module is only meant for use
with extra-low voltage (DC 24 V).
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Connection to a higher or not reliably disconnected voltage can
cause hazardous conditions or damages.
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Only the intended circuit protectors must be used.
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The technical data of the circuit protectors used have to be
observed.
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The entire power distribution system must only be installed by
qualified personnel.
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Only after expert installation must the device be supplied with
power.
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After tripping of the circuit protector and before reset, the cause
of the failure (short circuit or overload) must be remedied.
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The national standards (e.g. for Germany DIN VDE 0100) have
to be observed for installation and selection of feed and return
cables.
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For convenient adjustment and configuration by means of
projecting software a master data file (GSDML file) will be made
available for downloading on the E-T-A homepage.
Please observe separate user manual of the EM12D-TIO.
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Accessories
Supply
modules
Potential
modules
7
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3
REX12D Electronic Circuit Protector
Dimensions with connection diagram:
REX12D-TAx-xxx circuit protectors
98.5
92
label e.g. from
Phoenix
Contact ZBF-12
12.5
contact
arm
Mounting position: REX… preferred mounting
position horizontal
G
E
R
M
A
REX12D-
TA1-1xx
REX12D-
TA2-1xx
N
Y
DC24V
COM
DC24V
COM
G
E
7.5
80
R
M
A
N
Y
xA
xA
2.1
xA
2.1 | 2.2
LOAD +
LOAD +
1-channel
2-channel
installation
area
operating
area
snap-on socket for
rail EN 60715-35x7,5
momentary switch
for ON/OFF and
reset with integral
status indication
Typical time/current characteristic
(T
amb
= +23°C, U
B
= DC 24 V)
1000
100
trip time in seconds
Basic trip curve and schematic diagram REX12
Schematic diagram REX12
1.000
100
LINE
blade fuse
10
1
0,1
0,01
trip time in seconds
10
4A
1
0,1
4A
semi-
conductor
0,01
LOAD
0,001
0,001
0,8
1,0
1,2
1,4
1,6
1,8
2,0
2,2
2,4
2,6
2,8
3,0
3,2
3,4 I
KS
0,8
1
1,2 1,4 1,6 1,8
2
2,2 2,4 2,6 2,8
3
I
SC
... times rated current trip curve REX12
...times rated current
Temperature factor / continuous duty
The time/current characteristic depends on the ambient tempera-
ture. In order to determine the max. load current, please multiply the
current rating with the temperature factor and consider the factor for
side-by-side mounting.
Temperature factor table:
ambient temperature [°C]
temperature factor
0
1
10
1
23
1
40
0.95
50
0.90
60
0.85
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Note: When mounted side-by-side, the devices can carry max. 80 %
of their rated load or a different rating has to be selected (see technical
information: www.e-t-a.de/ti_e).
Note:
With high temperatures, the load current warning threshold “warn
limit typically 0.5 ... 1 x I
N
” will be reduced in accordance with the
temperature factor.
4
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1802
REX12D Electronic Circuit Protector
Description – EM12D-T supply module
The EM12D-T supply module receives the DC 24 V supply voltage,
e.g. from a switched mode power supply, and distributes it to the
installed intelligent circuit protectors via the integral connector arm of
the REX12D-T. The communication interface of the EM12D-T, which is
designed as an IO link device, allows a great number of diagnosis and
control commands to a superordinate IO link master of the control level.
Communication interface
Overview of commands:
Writing/reading of configuration (parameters)
Current limit value (50 %...100 %)
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Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
Operating voltage U
B
Operating current I
B
Reverse polarity protection
Quiescent current I
0
Insulation co-ordination
Power failure
buffering time
Terminals
Push-in terminal PT 10
DC 24 V (18...30 V)
max. 40 A
yes
typically 20 mA
0.5 kV / pollution degree 2
Reading of static product information
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Current ratings
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Product type
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Serial number
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Hardware version
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Software version
Reading of dynamic product information / measuring values
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Error memory
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Trip counter
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Reason of last trip
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Status / event of device
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Supply voltage: ACTUAL / MIN / MAX / MEDIUM VALUE
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Load voltage ACTUAL / MIN / MAX / MEDIUM VALUE
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Load current
Control commands
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switch on/off or reset load output
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reset error memory
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reset trip counter
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set parameters to factory setting
up 10ms
LINE+
0.5 mm
2
... 10 mm
2
, flexible
AWG24 – AWG8 rigid
stripping length
18 mm
Terminals
0V
Push-in terminal PT 2.5
0.14 mm
2
... 2.5 mm
2
, flexible
AWG24 – AWG14 rigid
stripping length
8 mm ... 10 mm
Dimensions (w x h x d)
12.5 x 98 x 80 mm
Mass
approx. 56 g
Modules to be mounted side-by-side
REX12D-TA1 1-channel
REX12D-TA2 2-channel max.16 channels
Visual status indication
green: Faultless operation
of operating condition
communication to IO link
via multicoloured
master available
LED:
green
blinking: independent operation
no communication to IO link
master
red:
critical fault detected
communication to IO link
master not available
Overview of ordering number codes
Supply module
EM12D-TIO-000-DC24V-40A
Ordering number code – EM12D
Type
EM12D
supply module for REX12D, with PT connection technology
Mounting method
T
rail mounting
Version: Communication, interface
IO
IO link
Additional functionality
0
without
Signal input
without signal input
0
Signal output
without signal output
Operating voltage
DC 24 V
voltage rating DC 24 V
Current rating range
40 A
EM12D - T
01 - 0 0
0 - DC 24 V - 40 A
ordering example
orange: non-critical fault detected
communication to IO link
master available
orange
blinking: uncritical fault detected
communication to IO link
master not available
red
blinking: bootloader mode active
no communication to IO link
master
IO link connection
X81 COM interface to IO link master
terminal 1
IO link L+DC +24V
connector 2: IO link C/Q
connector 3: IO link L-
When wiring and connecting to the point-to-point communication IO
link, the installation and wiring regulations of the PROFIBUS-DP User
Organisation (PNO) have to be observed.
Push-in terminals PT xx
connector, 3-pole (plugged on)
stripping length
0.25 – 0.5 mm²
6 mm
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