The AC/DC sensitive MRCDB300 device series is used as additional protection (protection against indirect contact) in earthed systems (TN and TT systems) in which AC or DC fault currents may occur.
Features
Structure of a protective device in accordance with IEC 60947-2 Annex M in combination with a circuit breaker providing isolating properties
Monitoring of the connected circuit breaker by means of contact feedback
RS-485 interface with Modbus RTU (reading out measured values/setting parameters)
Integrated switching outputs with two changeover contacts K1 and K2 (galvanically isolated)
Fulfils the protection goals protection of persons, fire protection and plant protection (depending on the variant)
Frequency range DC…100 kHz
Combined test and reset button
Multicolour LED indicating operation, exceeded response value, disturbances and status messages
AC/DC sensitive type B measured value acquisition acc. to IEC 60755
AC/DC sensitive type B+ measured value acquisition acc. to VDE 0664-400
Exchangeable electronic enclosure without mechanical separation of the primary conductors
Extension/retrofitting or modification of functionalities in case of changed monitoring requirements
Insensitive to load currents due to full magnetic shield (CTBC20P…210P only)
Connection monitoring of the measuring current transformer with cyclical test current
Use of all MRCDB300 for all CTBC… measuring current transformer sizes
