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MRCDB423_D00396_00_M_XXEN/06.2020
MRCDB423
MRCDB423
MRCDB423_D00396_00_M_XXEN/06.2020
1. Making effective use of this documentation
1.1 How to use this manual
To make it easier for you to understand and revisit certain sections in this manual, we have used symbols to
identify important instructions and information. The meaning of these symbols is explained below:
1.2 Intended use
The AC/DC sensitive MRCDB423 with the corresponding CTUB101-CTBC… measuring current transformers
are used as additional protection (protection against indirect contact) in earthed systems (TN and TT systems)
in which AC or DC fault currents may occur. Part of these systems are particularly loads containing six-pulse
rectifiers or one-way rectifiers with smoothing, such as converters, battery chargers, construction site equip-
ment with frequency-controlled drives.
This manual is intended for qualified personnel working in electrical engineering and
electronics!
This signal word indicates that there is a high risk of danger that will result in death or
serious injury if not avoided.
This signal word indicates a medium risk of danger that can lead to death or serious injury,
if not avoided.
This signal word indicates a low-level risk that can result in minor or moderate injury or
damage to property if not avoided.
This symbol denotes information intended to assist the user in making optimum use of the
product.
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