REX12 Electronic Circuit Protector
Description
The compact and flexible all-in-one solution REX consists of several
perfectly matched components. It comprises the EM12-T supply
module for the plus and minus potential via a single or double channel
REX12-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. Connection of the only 12.5 mm wide
modules is exclusively with push-in terminals which allow no-tool
time-saving wiring.
The circuit protectors are placed on the symmetrical rail one after
another in combination with EM12-T and PM12-T and are electrically
connected by means of the built-in connector arm - no further acces-
sories are required. The circuit protector REX12-T offers selective over-
current protection by responding to short circuit or overload faster than
the switch mode power supply. Capacitive loads of up to 20,000µF
can be switched on without problems. The circuit protector is available
in all standard fixed and adjustable current ratings from 1 A to 10 A.
Besides the UL508listed approval and NEC Class2, the REX12-T also
meets the requirements of cable protection to EN60204-1.
Benefits
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Features
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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 12.5 mm (1-channel) or 6.25 mm
(2-channel)
Fixed and adjustable current ratings 1A-10A
Integral fail-safe element, adjusted to max. current rating
Switching capacitive loads up to 20,000 µF
Manual ON/OFF/reset momentary switch
Clear status indication by means of LED and signal contact Si
Connection via push-in terminals including orange press release
buttons
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
4
volumes. Our preferred types are supplied at shorter lead times than
non-standard versions.
Preferred types – for more details on all configurations please see page 3
Preferred types are E-T-A products most frequently used by E-T-A
customers. We manufacture E-T-A preferred types in particularly high
Preferred types
Preferred types
REX12-TA1
REX12-TA1-107-DC24V-
REX12-TA2
REX12-TA2-107-DC24V-
REX12D-TE2
REX12D-TE2-100-DC24V-
2-channel,
adjustable
1A-10A
x
Short description
1-channel
2-channel
Preferred ratings (A)
2
x
4
x
6
x
10
x
2/2
2/2
x
4/4
4/4
x
6/6
6/6
x
2
4
6
10
Approvals
Data sheet
The current data sheet is available on our website: www.e-t-a.de/e359
NEC Class2
Compliances
1830
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1
REX12 Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
REX12-Txx-xxx circuit protectors
REX12-TA1-107-DC24V-xA
1-channel
REX12-TB1-107-DC24V-xA
(available on request)
1-channel
REX12-TA2-107-DC24V-xA/xA
2-channel
REX12D-TE2-100-DC24V-xA-xA
2-channel
The REX12-TAx is operated in the standard mode with EM12-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
standard mode.
Operating voltage U
B
DC 24 V (18...30 V)
Closed-circuit current I
0
REX12-Tx1 1-channel
in ON condition: typically 5 mA
REX12-TA2 2-channel
in ON condition: typically 8 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:
REX12-Tx1
1 A, 2 A, 3 A, 4 A, 6 A, 8 A, 10 A
REX12-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
by means of LED
green/orange
blinking: load current warning limit
reached 90 %
orange: overload or short circuit until
disconnection
red:
- after disconnection due to
overload or short circuit
- after undervoltage release of
operating voltage in ON condi-
tion with autoreset
OFF:
Device switched off by means of
ON/OFF momentary switch or
no operating voltage
Load circuit
Load output
power MOSFET switching output
(plus switching)
Load current warning limit typically 0.9 x I
N
(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
: 0,5s
with trip times (t
ÜL
)
typically I
ÜL
: I
N
x 2.00
t
ÜL
: 0.1s
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)
Voltage drop in load circuit at I
N
and at I
N
70 % for REX12-Txx
between LINE+ and LOAD+
I
N
: 1 A (CL2)
typically 180 mV
I
N
: 70 %
typically 125 mV
I
N
: 2 A (CL2)
typically 110 mV
I
N
: 70 %
typically 80 mV
I
N
: 3 A
typically 120 mV
I
N
: 70 %
typically 85 mV
I
N
: 3 A-CL2
typically 130 mV
I
N
: 70 %
typically 90 mV
I
N
: 4 A
typically 115 mV
I
N
: 70 %
typically 80 mV
I
N
: 4 A-CL2
typically 180 mV
I
N
: 70 %
typically 120 mV
I
N
: 6 A
typically 170 mV
I
N
: 70 %
typically 110 mV
I
N
: 8 A
typically 160 mV
I
N
: 70 %
typically 105 mV
I
N
: 10 A
typically 180 mV
I
N
: 70 %
typically120 mV
2) depending on power source
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
REX12D-TE2-100-DC24V-1A-10A
I
N
: 1 A
typically 30 mV
I
N
: 70 %
typically 28 mV
I
N
: 2 A
typically 39 mV
I
N
: 70 %
typically 34 mV
I
N
: 3 A
typically 48 mV
I
N
: 70 %
typically 40 mV
I
N
: 4 A
typically 57 mV
I
N
: 70 %
typically 46 mV
I
N
: 5 A
typically 66 mV
I
N
: 70 %
typically 52 mV
I
N
: 6 A
typically 74 mV
I
N
: 70 %
typically 59 mV
I
N
: 7 A
typically 83 mV
I
N
: 70 %
typically 65 mV
I
N
: 8 A
typically 92 mV
I
N
: 70 %
typically 71 mV
I
N
: 9 A
typically 101 mV
I
N
: 70 %
typically 77 mV
I
N
: 10 A
typically 110 mV
I
N
: 70 %
typically 83 mV
Fail-safe element
I
N
: 1 A (CL2)
fail-safe I
N
: 1 A
integral
I
N
: 2 A (CL2)
fail-safe I
N
: 2 A
blade fuse
I
N
: 3 A
fail-safe I
N
: 3.15 A
adjusted to
I
N
: 3A-CL2
fail-safe I
N
: 4 A
related current rating I
N
I
N
: 4 A
fail-safe I
N
: 4 A
I
N
: 4 A-CL2
fail-safe I
N
: 4 A
I
N
: 6 A
fail-safe I
N
: 6.3 A
I
N
: 8 A
fail-safe I
N
: 8 A
I
N
: 10 A
fail-safe I
N
: 10 A
I
N
: 1 A/1 A (CL2) fail-safe I
N
: 1 A/1 A
I
N
: 2 A/2 A (CL2) fail-safe I
N
: 2 A/2 A
I
N
: 3 A/3 A
fail-safe I
N
: 3.15A/3.15A
I
N
: 3 A/3 A-CL2 fail-safe I
N
: 4 A/4 A
I
N
: 4 A/4 A
fail-safe I
N
: 4 A/4 A
I
N
: 4 A/4 A-CL2 fail-safe I
N
: 4 A/4 A
I
N
: 6 A/6 A
fail-safe I
N
: 6.3 A/6.3 A
I
N
: 1 A-10 A
fail-safe I
N
: 16 A
Operating voltage
OFF at typically U
B
< 16.0 V
monitoring re.
ON at typically U
B
> 19.0 V
undervoltage
hysteresis typically 2 V
with automatic OFF and ON switching
ON delay
- with power ON
channel 1: typically 100 ms (REX12-TAx)
channel 2: typically 200 ms (REX12-TAx)
channel 1: typically 1,500 ms (REX12D-TE2)
channel 2: typically 1,600 ms (REX12D-TE2)
- when switching on with channel 1: typically 5 ms
ON /OFF switch or
channel 2: typically 100 ms
- after undervoltage
channel 1: typically 5 ms
channel 2: typically 5 ms
Disconnection of load circuit - manually on the device with the
ON/OFF momentary switch
- 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 device can only be switched on when
operating voltage is applied
- applying
The device starts up with the condition
operating voltage
last stored.
4
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1830
REX12 Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
Enquire
adjusted current rating
with REX12D-TE2
Enquiry of currently adjusted
current rating, 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 pulse/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).
The adjustment mode directly on the
REX12D-TE2 can only be activated in the
REX12D-TE2 standard mode
The adjustment mode is started per chan-
nel by pushing the button for ≥ 5 seconds.
After releasing the button, the LED is RED
for 333 ms to indicate start of adjustment.
The LED is blinking GREEN with a pulse/
break ratio of 1/4 at a frequency of 0.6
Hz for visual indication. After reaching
the max. adjustment value, signalling
re-starts. Overrun of the max. adjustment
value after 1 Ampere is indicated by the
RED LED (333 ms). The current rating to
be adjusted is adopted by pushing the
button during the blinking period of 1 A
up to the max. adjustment value. If for
instance the button is pushed after the
7
th
illumination of the GREEN LED, 7A is
adopted as current rating and visual indi-
cation again shows the current operating
condition. If the button is not pressed,
the adjustment mode is left after 5 times
signalling the current rating range without
a new current rating being adopted and
the visual indication returns to current
status indication.
The adjustment mode is possible in all
operating conditions (ON, OFF, UNDER-
VOLTAGE and TRIPPED).
a blocked load output (blocked by over-
load / short circuit) can externally be reset
by the ON/OFF momentary switch
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)
Status output SM
Electrical data
status indicator in REX system
minus switching signal output
Group signalling is implemented in
connection with EM12-T supply module
0.14 mm
2
... 2.5 mm
2
flexible
AWG24 – AWG14 rigid
8 mm ... 10 mm
12.5 x 80 x 98.5 mm
Terminals
LOAD+
Push-in terminal PT 2.5
Adjustment of
current rating with
stripping length
Dimensions (w x h x d)
Mass
REX12-TA1-xxx 1-channel approx. 57 g
REX12-TB1-xxx 2-channel approx. 60 g
REX12-TA2-xxx 2-channel approx. 58 g
REX12D-TE2-xxx 2-channel approx. 62 g
General data REX / EM / PM
Housing material
moulded
Mounting
symmetrical rail to EN 60715-35x7.5
Ambient temperature
-25 °C ... +60 °C T(without condensation,
cf. EN 60204-1)
Storage temperature
-40 °C ... +70 °C
Mounting temperature
+5° ... +60 °C
Humidity
96 hrs / 95% RH/40 °C to IEC 60068-2-
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
Operation pressure
4 bar above atmospheric pressure
Corrosion
96 hrs. in 5 % salt mist to
only PM 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
Dielectric strength
Insulation resistance
(OFF condition)
Conformity
IP20
noise emission
EN 61000-6-3
susceptibility:
EN 61000-6-2
(IEC 60934) 0.5 kV / pollution degree 2
max. DC 30 V (load circuit)
n/a, only electronic disconnection
CE marking
4
Reset function
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
1830
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3
REX12 Electronic Circuit Protector
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
PM and EM – Approvals of accessories see technical data of accessories
cULus508listed pending for REX12D-TE2 and REX12-TB1
Preferred types – a short explanation.
Preferred types are E-T-A products most frequently used by E-T-A
customers. We manufacture E-T-A preferred types in particularly high
volumes. Our preferred types are supplied at shorter lead times than
non-standard versions.
Preferred types
Preferred types
REX12-TA1
REX12-TA1-107-DC24V-
REX12-TA2
REX12-TA2-107-DC24V-
REX12D-TE2
REX12D-TE2-100-DC24V-
2-channel,
adjustable
1A-10A
x
Short description
1-channel
2-channel
Preferred ratings (A)
2
x
4
x
6
x
10
x
2/2
2/2
x
4/4
4/4
x
6/6
6/6
x
2
4
6
10
Ordering number code – REX12-T
Type
REX12
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
B
2 load output terminals per channel, fixed current ratings xA
(only 1 channel)
Number of channels
1
1 channel (only 1-channel)
2
2 channels
Version
1
without physical isolation
Signal input
0
without signal input
Signal output
7
status output
Operating voltage
DC 24 V
voltage rating DC 24 V
Current rating
1 A (only 1 channel, Class2)
2 A (only 1 channel, Class2)
3 A (only 1 channel)
4 A (only 1 channel)
6 A (only 1 channel)
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 3A and 4A versions)
A
A
1- 1
2- 1
0
0
7 - DC24V - 10 A
example of 1-channel
7 - DC24V - 4A / 4A
- example of 2-channel
Ordering number code – REX12D-TE2
Type
REX12D
intelligent electronic circuit protector with PT connection technology
Mounting method
T
rail mounting
Design
E
1 load output terminal, per channel, adjustable current
ratings 1A-10A, standard and COM mode
Number of channels
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
1 A – 10 A (only 2 channels)
REX12D-T
E
2- 1
0
0 - DC24V - 1 A-10 A
example
4
Custom designed versions
Looking for a version you cannot find in our ordering number code?
Please get in touch. We will be pleased to find a solution for you.
REX12 - T
REX12 - T
4
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1830
REX12 Electronic Circuit Protector
Overview of ordering number codes
Supply module
Circuit protectors:
1-channel
EM12-T00-000-DC24V-40A
EM12-T01-001-DC24V-40A
REX12-TA1-107-DC24V-1A (Class2)
REX12-TA1-107-DC24V-2A (Class2)
REX12-TA1-107-DC24V-3A
REX12-TA1-107-DC24V-3A-CL2 (Class2)
REX12-TA1-107-DC24V-4A
REX12-TA1-107-DC24V-4A-CL2 (Class2)
REX12-TA1-107-DC24V-6A
REX12-TA1-107-DC24V-8A
REX12-TA1-107-DC24V-10A
REX12-TB1-107-DC24V-1A (Class2)
REX12-TB1-107-DC24V-2A (Class2)
REX12-TB1-107-DC24V-3A
REX12-TB1-107-DC24V-3A-CL2 (Class2)
REX12-TB1-107-DC24V-4A
REX12-TB1-107-DC24V-4A- CL2 (Class2)
REX12-TB1-107-DC24V-6A
REX12-TB1-107-DC24V-8A
REX12-TB1-107-DC24V-10A
REX12-TA2-107-DC24V-1A/1A (Class2)
REX12-TA2-107-DC24V-2A/2A (Class2)
REX12-TA2-107-DC24V-3A/3A
REX12-TA2-107-DC24V-3A/3A-CL2
(Class2)
REX12-TA2-107-DC24V-4A/4A
REX12-TA2-107-DC24V-4A/4A-CL2
(Class2)
REX12-TA2-107-DC24V-6A/6A
REX12D-TE2-100-DC24V-1A-10A
REX12-Quat-Pack-1A-10A electronic circuit protector
REX12-Quat-Pack-1A-10A
4-channel pack, selective load protection, voltage rating DC24V
variable current ratings 1A-10A in 1A steps, rail mounting, installation
width 37.5 mm, push-in connection technology, signalling with
auxiliary contact N/O
Current ratings 4 x 1A-10A adjustable
A pack consists of
1 supply module, EM12-T01-001-DC24V-40A
2 circuit protectors, 2-channel, adjustable 1-10A, REX12D-TE2-100-
DC24V-1A-10A
Part number: X22378501
Circuit protectors:
1-channel
2 load output
terminals
REX12-Quat-Pack-1A-10A
Circuit protectors:
2-channel
G
EM12-
T01-001
REX12D-
TE2-1xx
REX12D-
TE2-1xx
E
R
M
Circuit protectors
2-channel, adjustable
Accessories
Supply modules
DC24V
40 A
DC24V
10A
9A
8A
7A
6A
5A
4A
3A
2A
1A
DC24V
10A
9A
8A
7A
6A
5A
4A
3A
2A
1A
A
N
Y
13
14
1-10A
1-10A
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
0V
1-10A
2.1 2.2
1-10A
2.1
2.2
Potential modules
LINE +1
LOAD +
LOAD +
4
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