Bender LINETRAXX CTUB100 Series - Wiring Diagram

CTUB100-series_D00362_06_M_XXEN/04.2025 5
LINETRAXX® CTUB100 series
Wiring diagram
CTX-…
CTBCx
CTUB101
+12V -12V TGND
S1(k)S2(l)
1 m
2,5 m
5 m
10 m
50 mm
250 mm
to the loads
CTXS-…
CTBCx
CTUB102
CTUB105
24V GNDk
l
1 m
2,5 m
5 m
10 m
50 mm
250 mm
24V GND
S1(k)S2(l)
to the loads
RCMS410/425/460/490
(with CTUB102, CTUB105)
EDS441-LAB
(with CTUB102)
Power supply (STEP-PS…)
+
SPD
The use of a type 2 surge protection device (SPD) is mandatory due
to possible impulse voltages and in order to comply with normative
requirements. The surge protection device must be connected upstream
of the power supply unit on the supply side.
Features of the surge protection device:
- Nominal discharge current I
n
(8/20 μs): 20 kA
- Response time: 25 ns
- two-stage: 1 varistor + 1 spark gab
Alternatively, the power supply unit must be connected to a CAT II supply
without a surge protection device.
I
Caution!
When using several CTUB100 measuring current
transformers, the power supply (24V, GND)
must not be daisy-chained from current trans-
former to current transformer but should be
star-shaped (e.g. using a potential distributor).
RCMA420/423
i
Test current
The EDS441-LAB operates exclusively with a test
current of max. 25 mA. Adjust the measuring
range on the measuring current transformer to
this range.