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BENDER GmbH & Co KG
LINETRAXX® RCMA420

LINETRAXX® RCMA420

Product catalog summary

Overview: The LINETRAXX® RCMA420 is a residual current monitor designed for monitoring AC and pulsed DC currents in TN and TT systems, with a sensitivity range of 10 to 500 mA. It is suitable for systems where DC and AC fault currents may occur, such as those with rectifiers and frequency-controlled drives.

Device Features: The RCMA420 is a Type B residual current monitor compliant with IEC 62020 and IEC 60755. It features two adjustable response ranges for prewarning and alarm, adjustable switching hysteresis, r.m.s. value measurement, and various delay settings. It includes a multifunctional LC display, alarm indication via LEDs and changeover contacts, and options for N/C or N/O operation. The device is password-protected to prevent unauthorized parameter changes and includes a fault memory function.

Intended Use: The monitor is intended for earthed systems where DC and AC fault currents may occur. It is particularly useful for loads with rectifiers and frequency-controlled drives. Custom parameter settings are necessary to adapt to local conditions, and the device should be used within the specified technical limits.

Functionality: Upon applying supply voltage, a starting delay is activated. Residual current measurement is conducted via an external transformer, with values displayed on the LC display. If response values are exceeded, alarm relays activate after a delay. The device includes a test button for functionality checks and allows parameterization via the display and function keys.

Connection Monitoring: Continuous monitoring of CT connections is provided, with immediate alarm relay activation in case of faults. Faults can be reset manually if the fault memory is activated.

Technical Data: The device supports a range of supply voltages and frequencies, with protective separation and specific power consumption. It operates with external measuring current transformers and has defined response values and time delays. The device is designed for continuous operation and is protected to IP30 standards.

Environmental and Mechanical Conditions: The RCMA420 is designed to operate within specific temperature ranges and environmental conditions as per IEC standards. It is suitable for stationary use, transportation, and storage under defined conditions.

Connection Details: The device uses screw-type and push-wire terminals for connections, with specific requirements for conductor types and sizes. It includes detailed wiring instructions and connection properties.

Standards and Certifications: The RCMA420 complies with relevant IEC standards and is certified for use in various applications. It is designed for DIN rail mounting and includes a polycarbonate enclosure with a flammability class of UL94V-0.

Ordering Information: The document provides part numbers for different configurations of the RCMA420 and associated accessories, including measuring current transformers and connecting cables.

Catalog excerpts

Residual current monitor for monitoring AC and (pulsed) DC currents

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LINETRAXX® RCMA420 Residual current monitor for monitoring AC and (pulsed) DC currents IAn = 10...500 mA in TN and TT systems Device features • AC/DC sensitive residual current monitor Type B according to IEC 62020 and IEC 60755 • Two separately adjustable response ranges (prewarning, alarm) • Adjustable switching hysteresis • Starting delay, response delay and delay on release • Measured value display via multifunctional LC display • Alarm indication via LEDs (AL1, AL2) and changeover contacts (K1, K2) • N/C operation or N/O operation selectable • Password protection against unauthorized parameter...

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Connect the device according the wiring diagram. Observe the manuals of the respective measuring current transformer. Connection of measuring current transformers Connection to the RCMA420 residual current monitor using the CTX-... connecting cable. Colour coding for CTX...: k = yellow, l = green, -12 V = black, GND = brown, +12 V = red, Test (T) = orange

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Insulation coordination acc. to IEC 60664-1/IEC 60664-3 Specified time RCMA42x-D-1 Rated insulation voltage 100 V Overvoltage category/pollution degree 111/3 Rated impulse voltage 2.5 kV Rated insulation voltage 250 V Overvoltage category/pollution degree MI/3 Rated impulse voltage 4 kV Supply voltage Starting delay t Response delay ton1 (prewarning) Response delay ton2 (main alarm) Delay on release toff °perating time tae at /4n = 1 x /4n1/2 Operating time tae at /4n = 5 x /4n1/2 Response time tan Recovery time tb Number of reload cycles Supply voltage range Us Operating range Us Frequency rangeUs...

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Environment/EMC EMC Operating temperature Classification of climatic conditions IEC 60721 (except condensation and formation of ice) Stationary use (IEC 60721-3-3) Transportation (IEC 60721-3-2) Storage (IEC 60721-3-1) Classification of mechanical conditions acc. to IEC 60721 Stationary use (IEC 60721-3-3) Transportation (IEC 60721-3-2) Storage (IEC 60721-3-1) Connection For UL applications: Use 60/70 °C copper conductors only! Connection type screw-type terminals Connection properties 0.2…4 / 0.2…2.5 mm2 rigid/flexible (AWG 24…12) multi-conductor connection (2 conductors 0,2…1,5 / 0,2…1,5 mm2...

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Ordering information

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LINETRAXX® RCMA420

LINETRAXX® RCMA420

Catalog excerpts

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