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.
Depending on the requirement, up to 16 circuit protectors can be
placed on the symmetrical rail and are electrically connected by
means of built-in connector system - no further accessories required.
The circuit protector REX12-T offers selective overcurrent protection
by responding to short circuit or overload faster than the switch mode
power supply. Capacitive loads of up to 20,000 µF can be switched on
without problems. The circuit protectors are available in all standard
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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Combination of supply modules, overcurrent protection and
power distribution
Single and double channel 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 current ratings from 1 A to 10 A
Integral fail-safe element, adjusted to 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
4
Preferred types – a short explanation. For more details on all configurations please see ordering number
code on page 3
Preferred types are E-T-A products most frequently used by our cus-
tomers. We manufacture our preferred types in substantial quantities.
At the same time 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-
2-channel
short description
1-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
Approval logos and markings
Data sheet
The current data sheet is available on our website: www.e-t-a.de/d359
NEC Class2
1802
www.e-t-a.de
1
REX12 Electronic Circuit Protector
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
REX12-TAx-xxx circuit protectors
REX12-TA1-107-DC24V-xA
1-channel
REX12-TA2-107-DC24V-xA/xA
2-channel
Operating voltage U
B
DC 24 V (18...30 V)
Closed-circuit current I
0
REX12-TA1 1-channel in ON condition
typically 5 mA
REX12-TA2 2-channel in ON condition
typically 8 mA
Reverse polarity protection yes
Power failure
buffering time
up to 10 ms
Current ratings I
N
fixed ratings:
REX12-TA1
current ratings
1 A, 2 A, 3 A, 4 A, 6 A, 8 A, 10 A
REX12-TA2
current ratings
1 A/1 A, 2 A/2 A, 3 A/3 A, 4 A/4 A, 6 A/6 A
Visual status indication
green: load circuit connected
by 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
condition with autoreset
device switched off by means of
ON/OFF momentary switch or
no operating voltage
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
Voltage drop in load circuit at I
N
and at I
N
70 % between LINE+ and
LOAD+
I
N
: 1 A
typically 180 mV
I
N
: 70 %
typically 125 mV
I
N
: 2 A
typically 110 mV
I
N
: 70 %
typically 80 mV
I
N
: 3 A
typically 120 mV
I
N
: 70 %
typically 85 mV
I
N
: 3A-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
: 4A-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 %
typically 120 mV
Operating voltage
OFF at typically U
B
< 16.0 V
monitoring
ON at typically U
B
> 19.0 V
with regard to low voltage hysteresis typically 2 V
with automatic ON and OFF switching
Switch-on delay
- with power ON
channel 1:
typically 100 ms
channel 2:
typically 200 ms
- when switching on via
ON/OFF momentary
switch or
- after undervoltage
Disconnection of load
circuit
channel 1:
typically 5 ms
channel 2:
typically 100 ms
channel 1:
typically 5 ms
channel 2:
typically 5 ms
- 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
device can only be switched on when
operating voltage is applied
The device starts up with the condition
last stored.
A blocked load output (blocked by
overload / 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
OFF:
4
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 0.9 x I
N
typically 5 %
typically I
OL
: I
N
x 1.05 t
OL
: 3s
typically I
OL
: I
N
x 1.35 t
OL
: 0,5s
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 s
1)
see time/current characteristic
1)
depending on the power source
Note:
Selection of current rating of the circuit protector
≤ rating of power supply
Switch-on of load circuit
- momentary switch
ON/OFF
- applying
operating voltage
Reset function
Leakage current in load
circuit in OFF condition
Capacitive loads
Free-wheeling diode
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
I
N
: 1 A
fail-safe I
N
: 1 A
integral
I
N
: 2 A
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
fail-safe I
N
: 1 A/1 A
I
N
: 2 A/2 A
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
Parallel connection of
several load outputs
Status output
Status indication REX12-T minus switching signal output
Group signalling is implemented in
connection with EM12-T supply module
Terminals
LOAD+
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 d)
12.5 x 98.5 x 80 mm
Mass
REX12-TA1-xxx 1-channel approx. 57 g
REX12-TA2-xxx 2-channel approx. 58 g
external free-wheeling circuit at inductive
load (rating according to load)
not allowed
2
www.e-t-a.de
1802
REX12 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:
terminal area
EM, PM:
EMC requirements
(EMC directive, CE logo)
Insulation co-ordination
Dielectric strength
Insulation resistance
(OFF condition)
Conformity
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
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
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
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 range
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 for
3A and 4A versions)
A
A
1- 1
2- 1
0
0
7 - DC24V - 10 A
example of 1-chan.
7 - DC24V - 4A / 4A CL2
example of 2-chan.
Approvals and standards
Approval
authority
UL
UL
UL
Standard
UL 2367
UL 1310
NEC Class2
cULus 508 listed
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
REX12 - T
REX12 - T
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-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
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
4
PM and EM – accessories approvals see technical data of accessories
Preferred types
Preferred types are E-T-A products most frequently used by our cus-
tomers. We manufacture our preferred types in substantial quantities.
At the same time our preferred types are supplied at shorter lead
times than non-standard versions.
preferred types
REX12-TA1
REX12-TA1-107-
DC24V-
REX12-TA2
REX12-TA2-107-
DC24V-
2-channel
short
description
1-channel
preferred ratings (A)
2
x
Circuit
protectors:
2-channel
4
x
6
x
10 2/2 4/4 6/6
x
2
4
6
10 2/2 4/4 6/6
x
x
x
Accessories
Supply
modules
Customer-specific variants
Looking for a version you cannot find in our ordering number code?
Please get in touch. We will find a solution for you.
Potential
modules
1802
www.e-t-a.de
3
REX12 Electronic Circuit Protector
Dimensions with connection diagram: REX12-TA1-xxx and REX12-TA2-xxx circuit protectors
98,5
92
12,5
contact arm
REX12-
TA1-1xx
REX12-
TA2-1xx
Label e.g. from
Phoenix
Contact ZBF-12
DC24V
DC24V
G
E
R
7,5
80
M
A
N
Y
xA
Momentary switch
for ON/OFF and
reset with integral
status indication
xA
2.1
xA
2.1
2.2
LOAD +
LOAD +
1-channel
2-channels
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)
Basic trip curve and schematic diagram REX12
4
trip time in seconds
1000
1.000
Schematic diagram REX12
LINE
100
100
blade fuse
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
Preferred mounting postion REX12: 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: www.e-t-a.de/ti_e).
Note:
With high temperatures, the load current warning threshold “warn limit
typically 0.9 x I
N
” will be reduced in accordance with the temperature
factor.
4
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1802
REX12 Electronic Circuit Protector
Description – EM12-T supply module
The EM12-T supply module receives the DC 24 V supply voltage, e.g.
from a switch mode power supply, and distributes it to the mounted
circuit protectors via the integral connector arm of the REX12-T.
The potential-free auxiliary contact in the EM12-T indicates any
detected failures through the circuit protector,e.g. to the superordinate
control unit (CPU).
Dimensions EM12-T01-xxx supply module
98
12,4
91,5
G
EM12-
T01-001
E
R
M
A
Technical data (T
amb
= +23 °C, U
B
= DC 24 V)
Operating voltage U
B
DC 24 V (18...30 V)
max. 40 A
Operating current I
B
Reverse polarity protection yes
Signalling
only EM12-T01-001-DC24V-40A
typically 10 mA
Quiescent current I
0
potential-free auxiliary contact
max. DC 30 V / 0.5 A min. 10 V / 1 mA
Group signalling Si
auxiliary contact, make contact
contact: Si (13) / Si (14)
normal condition:
auxiliary contact closed
based on all protection modules
- when ON, load output connected
- when OFF, load output disconnected
auxiliary contact open
based on one or more protection modules
- after overload or short circuit trip
- after undervoltage release of operating
voltage in ON condition with autoreset
- at no operating voltage U
B
in supply
module
0.5 kV / pollution degree 2
DC24V
40 A
N
Y
13
14
OV
LINE +1
80
snap-on socket for
rail EN 60715-35x7,5
Label e.g. from
Phoenix Contact ZBF-12
Fault condition:
Schematic diagram EM12-Txx-xxx with REX12-xx
EM12-T01-001-DC24V-40A
max. 16 pcs
EM12-T
14
13
REX12-T
Insulation co-ordination
Power failure
buffering time Si
Terminals
Push-in terminal PT 10
up to 10 ms
LINE+
0.5 mm
2
... 10 mm
2
, flexible
AWG20 – AWG8 rigid
stripping length
18 mm
Terminals
0 V / Si 13 / Si 14
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. 52 g
Number of circuit protectors
to be mounted on EM12 side by side
REX12-TA1-x
REX12-TA2-x
max. 16 pcs
4
0V
LINE+1
LOAD+ 21
|
(22)
EM12-T00-000-DC24V-40A
max. 16 pcs
EM12-T
REX12-T
Ordering number code – EM12
type
EM12
0V
supply module for REX12, with PT connection technology
Mounting method
T
rail mounting
Version: Communication, interface
00
without signal
01
analog signal
Additional functionality
0
without
Signal input
0
without signal input
Signal output
0
without auxiliary contact
1
signal make contact
Operating voltage
DC 24 V voltage rating DC 24 V
Current rating range
40 A
01 - 0 0
1 - DC 24 V - 40 A
example
LINE+1
LOAD+ 21
|
(22)
EM12 - T
1802
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5
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