REX12-Tx-E electronic circuit protector REX12-Tx-E electronic circuit protector
www.e-t-a.de
6
2045
4
Temperature factor/Permanent current rating
Typical time/current characteristic (T
U
= +23 °C, U
B
= DC 24 V) Principle characteristic curve and schematic diagram REX12
1000
100
trip time in seconds
...times rated current
10
1
0.1
0.01
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
trip time in seconds
... times rated current trip curve REX12
1,000
100
10
1
0.1
0.01
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
SC
Schematic diagram REX12
blade fuse
semi-
conducto
4 A
LINE
4 A
LOAD
The time/current characteristic depends on the ambient temperature.
To determine the maximum permissible load current, the rated device
current must be multiplied by the temperature factor and the series
mounting factor must be taken into account.
Temperature factor table:
Ambient temperature [°C] 0 10 23 40 50 60
Temperature factor 1 1 1 0.95 0.90 0.85
Note:
When mounted in series, the rated device current can be supplied to
a maximum of 80 % or must be oversized accordingly (see Technical
Information at E-T-A: www.e-t-a.de/ti_d).
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!
Current rating selection of the circuit protector ≤ Current rating of the
power source.
Mounting position REX… preferred mounting
position horizontal
GERMANY
All information and data given on our products are accurate and reliable to the best of our
knowledge, but E-T-A does not accept any responsibility for the use in applications which are
not in accordance with the present specification. E-T-A reserves the right to change specifi-
cations at any time in the interest of improved design, performance and cost effectiveness,
Dimensions are subject to change without notice. Please enquire for the latest dimensional
drawing with tolerances if required. Dimensions, data, drawings and description are not
binding! Amendments, errors and omissions excepted. Ordering codes of the products may
differ from their marking.
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