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 mod-
ule 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 REX12D protection system and the EM12D interface
module. The system combines the well-proven quality of DC24V over-
current protection with the communication options of the IO link and
Modbus RTU 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 12.5 mm wide modules feature a modular design with push-in
technology for wiring with press release buttons and allow no-tool
time-saving and maintenance-free wiring.
And what is more: no additional accessories are required when con-
necting 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
Reduces storage costs because only one product is required for
all current ratings
Features
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Control, diagnosis and monitoring via IO link and Modbus RTU
Combination of supply modules, overcurrent protection and
power distribution
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 and adjustable current ratings 1 A-10 A
Integral fail-safe element, adjusted to max. 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
Approvals
Data sheet
The current data sheet is available on our website: www.e-t-a.de/e751
NEC Class2
Compliances
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1830
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1
REX12D Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
REX12D-Txx-xxx circuit protectors
REX12D-TA1-100-DC24V-xA
1-channel
REX12D-TA2-100-DC24V-xA/xA
2-channel
REX12D-TE2-100-DC24V-xA-xA
2-channel
The REX12D-TAx is operated in the COM mode with EM12D-T. The
REX12D-TE2 can be operated both with EM12D-T or EM12-T. The
operating mode EM12D-T (COM mode) or EM12-T (standard) is
recognised automatically. The following data exclusively refer to the
COM mode.
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-channel
in ON condition: typically 10 mA
REX12D-TE2 1A-10A 2-channel in ON condition: typically 12 mA
Reverse polarity protection Yes
Power failure
buffering time
up to 10 ms
Rated current I
N
ratings:
REX12D-TA1
8 A, 10 A
REX12D-TA2
1 A/1 A, 2 A/2 A, 3 A/3 A, 4 A/4 A, 6 A/6 A
REX12D-TE2
1 A – 10 A condition upon delivery: max.
current rating
Visual status indication
green: - load circuit connected
of operating condition
by multicoloured
green/orange
LED:
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)
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
:
I
N
:
1 A/1 A (CL2) fail-safe I
N
: 1 A / 1 A
2 A/2 A (CL2) fail-safe I
N
: 2 A / 2 A
3 A/3 A
fail-safe I
N
: 3.15 A / 3.15 A
3A/3A-CL2 fail-safe I
N
: 4 A / 4 A
4 A/4 A
fail-safe I
N
: 4 A / 4 A
4A/4A-CL2 fail-safe I
N
: 4 A / 4 A
6 A/6 A
fail-safe I
N
: 6.3 A / 6.3 A
8A
fail-safe I
N
: 8 A
10 A
fail-safe I
N
: 10 A
1 A-10 A
fail-safe IN: 16A
at I
N
70% REX12D-TAx
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
70
70
70
70
70
70
70
70
70
%
%
%
%
%
%
%
%
%
typically
typically
typically
typically
typically
typically
typically
typically
typically
125 mV
80 mV
85 mV
90 mV
80 mV
120 mV
110 mV
105 mV
120 mV
Voltage drop in load circuit at I
N
and
between LINE+ and LOAD+
typically 180 mV
I
N
: 1 A (CL2)
typically 110 mV
I
N
: 2 A (CL2)
typically 120 mV
I
N
: 3 A
typically 130 mV
I
N
: 3 A-CL2
typically 115 mV
I
N
: 4 A
typically 180 mV
I
N
: 4 A-CL2
typically 170 mV
I
N
: 6 A
typically 160 mV
I
N
: 8 A
typically 180 mV
I
N
: 10 A
Voltage drop in load circuit at I
N
and at I
N
70 % for
REX12D-TEx between LINE+ and LOAD+
REX12D-TE2-100-DC24V-1A-10A
typically 30 mV
I
N
: 1 A
typically 39 mV
I
N
: 2 A
typically 48 mV
I
N
: 3 A
typically 57 mV
I
N
: 4 A
typically 66 mV
I
N
: 5 A
typically 74 mV
I
N
: 6 A
typically 83 mV
I
N
: 7 A
typically 92 mV
I
N
: 8 A
typically 101 mV
I
N
: 9 A
typically 110 mV
I
N
: 10 A
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
I
N
:
70
70
70
70
70
70
70
70
70
70
%
%
%
%
%
%
%
%
%
%
typically
typically
typically
typically
typically
typically
typically
typically
typically
typically
28
34
40
46
52
59
65
71
77
83
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
operating voltage
OFF at typically U
B
< 16.0 V
monitoring
ON at typically U
B
> 19 V
with regard to low voltage with automatic ON and OFF switching
ON delay
- with power ON
channel 1: typically 100 ms (REX12D-TAx)
channel 2: typically. 200 ms (REX12D-TAx)
channel 1: typically. 1,500 ms (REX12D-TE2,
depending on the slot)
channel 2: typically 1,600 ms (REX12D-TE2,
depending on the slot)
channel 1:
channel 2:
channel 1:
channel 2:
typically 5 ms
typically 100 ms
typically 5 ms
typically 5 ms
OFF
power MOSFET switching output
(plus switching)
Load current - warning limit typically 0.5 - 1.0 x I
N
(parameterisable)
(I
WLimit
)
hysteresis
typically 5 %
Overload current
typically I
ÜL
: I
N
x 1.05 t
ÜL
: 3s
disconnection (I
ÜL
)
typically I
ÜL
: I
N
x 1.35 t
ÜL
: 0.5,5s
typically I
ÜL
: I
N
x 2.00 t
ÜL
: 0.1s
with trip times (t
ÜL
)
typically I
ÜL
: I
N
x 2.50 t
ÜL
: 0.012 s
short circuit
typically at short circuit (I
SC
) t
SC
: 0.002 s
2)
trip time (t
SC
)
see time/current characteristic
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)
2) depending on power source
Load circuit
Load output
- when switching on by
means ON/OFF button
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
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1830
REX12D Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
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
Enquire
adjusted current rating
with REX12D-TE2
For switch-on the device has to be supplied
with operating voltage. The device
re-starts with the last stored condition.
Enquiry of currently adjusted
current rating is, independent of the
operating mode (COM or standard),
possible for each channel directly on the
REX12D-TE2
Enquiry mode is started by pushing the
button between ≥ 2 seconds and < 5
seconds. After releasing the button, the
LED is RED for 333 ms to indicate start of
enquiry. Afterwards, the LED flashes
ORANGE in a puls/break ratio of 1/2
with a frequency of 1 Hz to indicate the
adjusted current value. When the adjusted
current rating is reached, signalling
re-starts after the RED LED re-lights for
333 ms. The enquiry mode is left after
the adjusted current rating was signalled
5 times or by pressing the button. Visual
indication will now show again the current
operating condition.
The enquiry mode is possible in all operat-
ing conditions (ON, OFF, UNDERVOLTAGE
and TRIPPED).
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
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
Terminals
LOAD+
0.14 mm
2
... 2.5 mm
2
, flexible
AWG24 – AWG14 rigid
8 mm ... 10 mm
12.5 x 80 x 98.5 mm
Push-in terminal PT 2.5
stripping length
Dimensions (w x h x d)
Mass
REX12D-TA1-xxx 1-channel approx. 58 g
REX12D-Tx2-xxx 2-channel approx. 62 g
General data REX / EM / PM
Housing material
moulded
symmetrical rail to EN 60715-35x7.5
Mounting
Ambient temperature
-25 °C...+60 °C (without condensation, cf.
EN 60204-1)
-40 °C ... +70 °C
Storage temperature
Mounting temperature
+5° ... +60 °C
96 hrs / 95 % RH/40 °C to IEC 60068-2-
Humidity
78-Cab climate class 3K3 to EN 60721
Altitude
2,000 m above sea level
3,000 m above sea level up to +55 °C
4,000 m above sea level up to +50 °C
4 bar above atmospheric pressure
Operation pressure
Corrosion only PM
96 hrs. in 5 % salt mist to
and EM accessories
IEC 60068-2-11 test Ka
Vibration
5 g test to IEC 60068-2-6, test Fc
Degree of protection
IEC 60529, DIN VDE 0470
operating area REX12
IP30
terminal area
EM, PM:
EMC requirements
(EMC directive, CE logo)
Insulation co-ordination
(IEC 60934)
Dielectric strength
Insulation resistance
(OFF condition)
Conformity
IP20
noise emission
susceptibility
EN 61000-6-3
EN 61000-6-2
Reset function
0.5 kV / pollution degree 2
max. DC 30 V (load circuit)
n/a, only electronic disconnection
CE marking
Leakage current in load
circuit in OFF condition
Capacitive loads
Free-wheeling diode
Parallel connection of
several load outputs
external free-wheeling circuit at inductive
load (rating according to load)
not allowed
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REX12D Electronic Circuit Protector
Notes
The intelligent EM12D-T 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-T.
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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
E
1 load output terminal per channel, variable current ratings
xA/xA, adjustable standard and COM mode
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
8A
(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)
1 A – 10 A (only 2 channels)
Approval
CL2 Class2
only 3A and 4A versions
REX12D-T
REX12D-T
REX12D-T
A
A
E
1- 1
2- 1
2- 1
0
0
0
0 - DC24V - 10A
0 - DC24V - 1 A-10 A
example 1 channel
example variable
current ratings
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
0 - DC24V - 4A/4A-CL2
example 2 channels
PM and EM – accessories approvals see technical data of accessories
cULus508listed pending for REX12D-TE2 and EM12D-TMB
Overview of ordering number codes
Supply
module
Circuit
protectors:
1-channel
Protection
modules:
2-channel
EM12D-TIO-000-DC24V-40A
EM12D-TMB-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
REX12D-TE2-100-DC24V-1A-10A
EM12-T00-100-LINE-40A
EM12-T00-200-LINE-40A
EM12-T00-000-GND-40A
EM12-T00-300-GND-40A
Accessories
Supply
modules
7
Potential
modules
PM12-T01-00-LOAD-20A
PM12-T02-00-LOAD-20A
PM12-T03-00-GND-20A
4
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1830
REX12D Electronic Circuit Protector
Dimensions with connection diagram: REX12D-Txx-xxx circuit protectors
98.5
92
12.5
contact
arm
REX12D-
TE2-1xx
REX12D-
TA2-1xx
REX12D-
TA1-1xx
label e.g. from
Phoenix
Contact ZBF-12
DC24V
10A
9A
8A
7A
6A
5A
4A
3A
2A
1A
DC24V
COM
DC24V
COM
G
E
R
7.5
80
M
A
N
Y
1-10A
xA
Taster für ON/OFF/Reset
Anzeigemode für
einstellbare Varianten
Integrierter Statusanzeige
1-10A
2.1
2.2
xA
2.1
2.2
xA
2.1
LOAD +
LOAD +
LOAD +
2-channel
2-channel
1-channel
snap-on socket for
rail EN 60715-35x7,5
installation
area
operating
area
Time/current characteristic (T
amb
= +23 °C, U
B
= DC – 24 V)
1000
Basic trip curve and schematic diagram REX12
Schematic diagram REX12
1.000
100
100
LINE
blade fuse
trip time in seconds
trip time in seconds
10
1
0.1
0.01
10
4A
1
0,1
4A
semi-
conductor
0,01
LOAD
0.001
0,001
0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
I
SC
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
...times rated current
... times rated current trip curve REX12
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
Mounting position REX… preferred mounting
position horizontal
G
E
R
M
A
N
Y
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 on www.e-t-a.de/ti_d)
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.
Selection of current rating of the circuit protector ≤ rating of power
supply.
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