Safety instructions
11
RCMA423_D00063_03_M_XXEN/03.2021
2.3 Intended use
The AC/DC sensitive residual current monitor RCMA423 is designed for use in
earthed systems (TN and TT systems) where DC and AC fault currents may oc-
cur. These are in particular loads containing six-pulse rectifiers or one way rec-
tifiers with smoothing, such as converters, battery chargers, construction site
equipment with frequency-controlled drives.
Two separately adjustable response ranges allow to distinguish between
prewarning (I
Δn1
= 50…100 % of the set response value I
Δn2
) and main alarm
( I
Δn2
). Since the values are measured with measuring current transformers,
the RCMA423 is nearly independent of the nominal voltage and the current of
the system being monitored.
In order to meet the requirements of the applicable standards, customised pa-
rameter settings must be made on the equipment in order to adapt it to local
equipment and operating conditions. Please heed the limits of the range of
application indicated in the technical data.
Any use other than that described in this manual is regarded as improper.
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