5
TGH1442en/06.2012
1. Effective use of this manual
1.1 Notes for the user
This manual is intended for experts in electrical engineering and
electronics!
In order to make it easier for you to find specific text passages or references in
this manual and for reasons of comprehensibility, important information is
emphasized by symbols. The meaning of these symbols is explained below:
1.2 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 pre-
warning (I
Δn1
= 50…100 % of the set response value I
Δn2
) and 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.
Information calling attention to hazards are marked
with this warning symbol.
Information intended to assist the user to make optimum
use of the product are marked with the Info symbol.
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