*mydirectindustry

Catalogs
BENDER GmbH & Co KG
LINETRAXX® MRCDB423

LINETRAXX® MRCDB423

Product catalog summary

Product Description: The LINETRAXX® MRCDB423 is an AC/DC sensitive modular residual current device (MRCD) type B, designed for additional protection against indirect contact in earthed systems (TN and TT systems). It is particularly suitable for systems with loads containing rectifiers, such as converters and battery chargers. The device operates independently of the nominal voltage and operating current due to its use of measuring current transformers.

Functionality: Upon connection to supply voltage, the device enters a start-up delay during which it remains in an alarm state, keeping output relays open. Residual current measurement is conducted via an external transformer, with values displayed on an LC display. If prewarning thresholds are exceeded, the device initiates response delays and activates alarms. The device meets IEC 60947-2 Annex M requirements and includes a test button for functionality checks.

Device Features: Key features include AC/DC sensitivity, RMS value measurement, alarm indication via display and LEDs, relay outputs for alarms, and fault memory. The device is certified for use in earthed systems and supports modular installation.

Technical Specifications: The MRCDB423 supports a wide range of supply voltages and frequencies, with specific models for different voltage ranges. It features a robust insulation coordination, operates within specified environmental conditions, and supports continuous operation. The device is designed for DIN rail mounting and includes screw-type terminal connections.

Installation Instructions: All current-carrying cables must be routed through the measuring current transformer, avoiding protective conductors. Cables should be centered within the transformer to prevent nuisance tripping, and the internal diameter of the transformer should be at least twice the diameter of the conductor bundle.

Ordering Details: The document provides part numbers for different configurations of the MRCDB423 and compatible external measuring current transformers, specifying diameter and shielding options.

Catalog excerpts

Modular residual current device type B for additional protection (protection against indirect contact) in earthed systems (TN and TT systems)

Open the catalog to page 1

Modular residual current device type B for additional protection (protection against indirect contact) in earthed systems (TN and TT systems) Product description 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 equipment with...

Open the catalog to page 2

Wiring diagram Wiring diagram measuring current transformers PE LI L2 13 N 50 mm 1 - A1, A2 Connection to supply voltage Us cable of measuring current transformer external test and reset button * The measuring range must be set according to the response value in the evaluator.

Open the catalog to page 3

Overvoltage category/pollution degree III/2 Rated impulse voltage 2.5 kV Overvoltage category/pollution degree III/2 Rated impulse voltage 4 kV Protective separation (reinforced insulation) between Switching elements Number of switching elements 2 x 1 changeover contact Operating principle N/C operation Electrical endurance, number of cycles 10000 Rated operational voltage 230 V 230 V 24 V 110 V 220 V Rated operational voltage UL 200 V 200 V 24 V 110 V 200 V Rated operational current 5 A 3 A 1 A 0.2 A 0.1 A Minimum contact rating 1 mA at AC/DC > 10 V EMC IEC 60947-2 annex M (limit value class...

Open the catalog to page 5

Rated frequency Absolute values of the voltage range Installation instructions All current-carrying cables must be routed together through the measuring current transformer. Never route an existing protective conductor through the measuring current transformer. The primary conductors may only be bent from the specified minimum distance. The minimum bending radius specified by the manufacturers must be observed. * Distance to 90° angle = 2 x external diameter The cables must be centred in the measuring current transformer. To prevent nuisance tripping, the measuring current transformers should...

Open the catalog to page 6

LINETRAXX® MRCDB423

LINETRAXX® MRCDB423

Catalog excerpts

All BENDER GmbH & Co KG catalogs and technical brochures