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Serie LINETRAXX® MRCDB300

Serie LINETRAXX® MRCDB300
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LINETRAXX® MRCDB300 series AC/DC sensitive residual current monitoring modules for MRCD applications

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AC/DC sensitive residual current monitoring modules for MRCD applications Product description 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. Part of these systems are particularly loads containing six-pulse rectifiers or one-way rectifiers with smoothing, such as converters, battery chargers, construction site equipment with frequency-controlled drives. When the response value IΔn2 (alarm) is reached, the output relays K1 and K2 switch. By...

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Variants Electronic modules • MRCDB301 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; Measuring current transformers • CTBC20 Measuring current transformer, internal diameter 20 mm • MRCDB302 Type B+ modular residual current protective device acc. to VDE 0664-100 for fire protection, response value 300 mA; cut-off frequency 20 kHz (cannot be changed) • CTBC35 Measuring current transformer, internal diameter 35 mm • MRCDB303 Modular residual current protective device for plant protection...

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Wiring diagrams N/C principle N/C principle, contact feedback L1 * – 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 μs): 20 kA Response time: 25 ns two-stage: 1 varistor + 1 spark gab Alternatively, the power supply unit must be connected to a CAT II supply without a surge protection device.

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Wiring diagrams N/O principle N/O principle, contact feedback L1 * – 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 μs): 20 kA Response time: 25 ns two-stage: 1 varistor + 1 spark gab Alternatively, the power supply unit must be connected to a CAT II supply without a surge protection device.

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Connection RS-485 interface (Modbus RTU) wire jumper The internal 120 Ω terminating resistor can be connected by using the wire jumper. The internal 120 Ω terminating resistor can be connected by means of the DIP switch. System states: LED and output relays The LED indicates the system state by means of colours and lighting/flashing. The N/O contacts of relay outputs K1 and K2 have defined switching positions for each system state. System state Device switched off Normal operating state Alarm state Device is deenergised, no monitoring, no monitoring function The device is supplied with the...

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Dimension diagrams

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Technical data Insulation coordination acc. to IEC 60664-1/IEC 60664-3 Definitions: Measuring circuit (IC1) Primary conductors routed through the current transformer Secondary (IC2) Terminal block 1 (24 V, GND, D1, DG, T/R, GND, A, B, X1, X2) Control circuit 1 (IC3) Terminal block 2 (11,12,14) Control circuit 2 (IC4) Terminal block 3 (21,22,24) Rated insulation voltage 800 V Overvoltage category III Area of application ≤ 2000 m AMSL Rated impulse voltage: IC1((IC2-IC4) 8 kV IC2/(IC3-IC4) 4 kV IC3/IC4 4 kV Rated insulation voltage: IC1/(IC2-IC4) 800 V IC2/(IC3-IC4) 250 V IC3/IC4 250 V...

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Required terminals are included in the scope of delivery. Terminal block 1 Manufacturer Phoenix Contact Type DFMC 1.5/5-ST-3.5 BK The connection conditions of the manufacturer apply. Connection properties rigid 0.2…1.5 mm² (AWG 24…16) flexible 0.2…1.5 mm² (AWG 24…16) with ferrule 0.25…0.75 mm² (AWG 24…19) Terminal block 2, 3 Manufacturer Phoenix Contact Type FKCVW 2.5/ 3-ST-5.08 The connection conditions of the manufacturer apply. Connection capacity rigid 0.2…2.5 mm² (AWG 24…13) flexible 0.2…2.5 mm² (AWG 24…13) with ferrule 0.25…2.5 mm² (AWG 24…13) Operating mode Mounting Degree of...

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Example for the composition of an MRCD module Measuring current transformer: CTBC35 Final MRCD module Installation instructions • Do not route any shielded cables through the measuring current transformer. • xisting protective conductors and low-resistance conductor loops must not be routed through the measuring current transformer! E Otherwise, high currents could be induced into the conductor loop due to the AC/DC sensitive measuring technology used. PE Never route an existing protective conductor through the measuring current transformer. All current-carrying cables must be routed...

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BENDER Group MRCDB300 series_D00343_04_D_XXEN / 08.2021 / © Bender GmbH & Co. KG, Germany – subject to change! The specified standards take into account the edition valid until 08.2021 unless otherwise indicated. Bender GmbH & Co. KG Londorfer Straße 65 • 35305 Grünberg • Germany Tel.: +49 6401 807-0 • info@bender.de • www

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Serie LINETRAXX® MRCDB300 12Pages

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Serie LINETRAXX® MRCDB300
12Pages