Manual ENCTUB100-series_D00362_06_M_XXEN/04.2025
Intended use
The AC/DC sensitive measuring current transformers
(type B) of the CTUB100 series convert system leakage
and fault currents into an evaluable measurement
signal. The devices are suitable for detecting fault cur-
rents with smooth DC components. They consist of a
CTBC… measuring current transformer core and a
CTUB10… electronic module, which can be combined to
suit the application. The measuring current transform-
ers can be used in DC, AC, and 3(N)AC systems. The
measurement signal is evaluated using devices of the
RCMA4…, RCMS4…, RCMB4… or MRCDB4… series, re-
spectively EDS441-LAB series, to which the measuring
current transformers are connected. Any other use than
that described in this manual is regarded as improper.
General safety instructions
Part of the device documentation in addition to this
manual is the enclosed “Important safety instructions
for Bender products”.
Installation, connection and commissioning are to
be carried out by electrically skilled persons only!
It is essential to follow the existing safety instructions.
I
Danger! indicates a high risk of danger that will
result in death or serious injury if not avoided.
I
Caution! indicates a low-level risk that can
result in minor or moderate injury or damage to
property if not avoided.
i
This symbol refers to information that is
designed to help you make the best use of the
product.
Device features
• Multicolour LED for operation, fault and status
messages
• Electronic module can be exchanged without
mechanical separation of the primary conductors
• Extension/retrofitting or modification of functio-
nalities possible in case of changed monitoring
requirements
• Insensitive to load currents due to full magnetic
shield, can be used for high short-term system-
related load currents (for CTBC…P only).
• Monitoring of the connection to the measuring
current transformer
Overview: Possible combinations of evaluator, electronic module and
measuring current transformer core
Electronic module Evaluator Meas. CT core
Connecting
cable
Supply voltage
CTUB101
RCMA420 CTBC20(P)…60(P)
CTX…
(6 wires)
DC ±12 V
The evaluator supplies the
measuring current transformer.
RCMA423 CTBC20(P)…210(P)
RCMS460/490* CTBC20(P)…210(P)
CTX…
(5/6 wires)
DC ±12 V
External power supply unit AN420
CTUB102, CTUB105
RCMS410/425
/460/490
CTBC20(P)…210(P)
CTXS…
(4 wires)
DC 24 V
External power supply unit required
for measuring current transformer.
CTUB102
(Replaces CTUB104 in EDS441-LAB applications)
EDS441-LAB CTBC20(P)…60(P)
* Only recommended for retrofit if an AN420 power supply unit is already
available. In this case, if the ready-made connecting cable CTX… is used, the
green plugs of the connecting cable (on the evaluator side) must be removed.
Afterwards, the individual conductors must be crimped and connected to the
RCMS460/490 or the AN420. In this case, the conductor “T” is not used
LINETRAXX® CTUB100 series
AC/DC sensitive measuring current transformers (type B)
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