MRCDB300 series AC/DC sensitive residual current monitoring module for MRCD applications

MRCDB300 Series AC/DC sensitive residual current monitoring module Device 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) •...

Variants Electronic modules Type B modular residual current protective device acc. to IEC 60755 for the protection of persons in case of indirect contact, response value 30 mA Type B+ modular residual current protective device acc. to VDE 0664-100 for fire protection, response value 300 mA Modular residual current protective device for plant protection (N/C operation), freely configurable Modular residual current protective device for plant protection (N/O operation), freely configurable Modular residual current protective device type B acc. to IEC 60755 for the protection of persons in case...

The following applies to all wiring diagrams: • The use of a type 2 surge protection device (SPD) is mandatory due to possible impulse voltages and in order to comply with normative requirements. • The surge protection device must be connected upstream of the power supply unit on the supply side. • Features of the surge protection device - Nominal discharge current In (8/20 ^s): 20 kA - Two-stage: 1 varistor + 1 spark gap Alternatively, the power supply unit can be connected to a CAT II supply without a surge protection device. The power supply unit must be connected before the switch. Wiring...

N/O principle without contact feedback N/O principle with contact feedback Wiring diagram MRCDB30… (N/O principle without contact feedback) Wiring diagram MRCDB30… (N/O principle with contact feedback) 21, 22, 24 = Relay for main alarm = surge protection device 21, 22, 24 = Relay for main alarm = surge protection device We recommend operating the alarm relay K1 according to the N/C principle. This allows detecting and reporting the failure of the supply voltage and the internal power supply unit. For economical installation reasons, alarm relay K2 can be operated according to the N/O principle....

The LED indicates the system state by means of colours and lighting/flashing. The changeover contacts of relay outputs K1 and K2 have defined switching positions for each system state.

Dimension diagrams

Example for the composition of an MRCD module Measuring current transformer: CTBC35 Final MRCD module Installation instructions for measuring current transformers CAUTION Device damage due to high induction currents! High currents can be induced into the conductor loop due to the AC/DC sensitive measurement technology used. Do not route protective conductors and lowresistance conductor loops through the measuring current transformer! Device damage due to interference pulses! The connecting cable (supply, analogue interface…) must not be routed directly past the current transformer core. Risk...

Measuring circuit Control circuit 1 (IC3) Control circuit 2 (IC4) Rated insulation voltage Overvoltage category Pollution degree Operating altitude Insulation coordination acc. to IEC 60664-1/IEC 60664-3Definitions Primary conductors routed through the current transformer Terminal block 1 (24 V, GND, D1, DG, T/R, GND, A, B, X1, X2) Terminal block 2 (11, 12, 14) Terminal block 3 (21,22, 24) 800 V Ml 2 Internal diameter measuring current see "Dimension diagrams", Page 7 Characteristics according to IEC 62020 AC/DC sensitive, type B MRCDB303 (plant protection) 30 mA...3 A (freely configurable),...

Multicolour LED red/green, Refer to "System states: LED and output relays", Page 6 Required terminals are included in the scope of delivery. Phoenix Contact The connection conditions of the manufacturer apply. Maximum length connecting cable 10 m Connection properties with ferrules Number of changeover contacts Relay mode Phoenix Contact Switching capacity Contact data acc. to IEC 60947-5-1 Rated operational voltage AC Utilisation category Rated operational current AC Rated operational current AC (for UL applications) Rated operational voltage DC Utilisation category Rated operational current...

Ordering details Measuring current transformers Accessories © Bender GmbH & Co. KG, Germany Subject to change! The specified standards take into account the edition valid until 07.2024 unless otherwise indicated. RBENDERBender GmbH & Co. KG Londorfer StraGe 65 35305 Grunberg Germany