LINETRAXX® RCMA420

The AC/DC sensitive residual current monitor RCMA420 is designed for monitoring earthed power supply systems (TN and TT systems) where smooth DC fault currents or residual currents continuously greater than zero may occur. These are in particular loads containing six-pulse rectifiers or one way rectifiers with smoothing, such as converters, battery chargers, construction site equipment with frequency-controlled drives. Currents in single conductors can be monitored too.

The prewarning stage (50…100 % of the set response value IΔn2) allow to distinguish between prewarning and alarm. Since the values are measured with measuring current transformers, the device is nearly independent of the load current and the nominal voltage of the system.
 

Questions? Contact us!

LINETRAXX® RCMA420
LINETRAXX® RCMA420

The AC/DC sensitive residual current monitor RCMA420 is designed for monitoring earthed power supply systems (TN and TT systems) where smooth DC fault currents or residual currents continuously greater than zero may occur. These are in particular loads containing six-pulse rectifiers or one way rectifiers with smoothing, such as converters, battery chargers, construction site equipment with frequency-controlled drives. Currents in single conductors can be monitored too.

The prewarning stage (50…100 % of the set response value IΔn2) allow to distinguish between prewarning and alarm. Since the values are measured with measuring current transformers, the device is nearly independent of the load current and the nominal voltage of the system.
 

Questions? Contact us!

Features

  • AC/DC sensitive residual current monitor Type B acc. to IEC 62020 and IEC/TR 60755
  • r.m.s. value measurement (AC+DC)
  • Two separately adjustable response values 10…500 mA
  • Frequency range 0…2000 Hz
  • Start-up delay, response delay and delay on release
  • Digital measured value display via LC display
  • Measured value memory for operating value
  • CT connection monitoring
  • LEDs: Power On, Alarm 1, Alarm 2
  • Internal/external test/reset button
  • Two separate alarm relays (one changeover contact each)
  • N/O or N/C operation and fault memory behaviour selectable
  • Continuous self monitoring
  • Multi-functional LC display
  • Password protection for device settings
  • Sealable transparent cover
  • Two-module enclosure (36 mm)
  • RoHS compliant
  • Push-wire terminal (two terminals per connection)

Applications

  • AC/DC sensitive residual current monitoring in earthed two, three or four conductor systems (TN and TT systems)
  • Monitoring of variable-speed drives, UPS systems, construction site equipment, printing machines, battery systems, laboratory equipment, wood working machines, MF welding systems, furniture industry, medical electrical equipment, etc.
  • AC/DC sensitive current monitoring of single conductors de-energised under normal conditions (e.g. N and PE conductors)

LINETRAXX® RCMA420 Variant(s)

TypeResponse range IΔnFrequency rangeSupply voltage US*Art. No.**
RCMA420-D-110…500 mA0…2000 HzDC 9,6…94 V /
AC 16…72 V, 42…460 Hz
B74043001
B94043001
RCMA420-D-210…500 mA0…2000 HzDC 70…300 V /
AC 70…300 V, 42…460 Hz
B74043002
B94043002

* Absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)

Optional Accessories for LINETRAXX® RCMA420

Measuring current transformers

TypeInternal diameter (mm)Art. No.
CTUB101-CTBC20ø 20B78120010
CTUB101-CTBC20Pø 20B78120020
CTUB101-CTBC35ø 35B78120012
CTUB101-CTBC35Pø 35B78120022
CTUB101-CTBC60ø 60B78120014
CTUB101-CTBC60Pø 60B78120024

Connection cable measuring current transformer – RCMA420-D

TypeLength/mArt. No.
CTX-1001B98110080
CTX-2502,5B98110081
CTX-5005B98110082
CTX-100010B98110083

Accessories

TypeArt. No.
Mounting clip for screw mounting (one piece per device)B98060008
Mounting frame XM420B990994 

Downloads for LINETRAXX® RCMA420

NameCategorySizeLanguageTimestampD-/B-Number
RoHS/REACH Report - B74043001 RoHS/REACH Report 253.1 KB 2024/09/0606.09.2024
RCMA42x CE Declarations of conformity 88.7 KB 2022/08/1212.08.2022
RCMA420 Manuals 3.2 MB DE2023/12/1414.12.2023D00059
RCMA420 Manuals 3.2 MB EN2023/12/1414.12.2023D00059
RCMA420 Manuals 735.0 KB FR2019/05/1313.05.2019D00059
RCMA420 Datasheets 3.0 MB DE2024/07/3131.07.2024D00059
RCMA420 Datasheets 3.0 MB EN2024/07/3131.07.2024D00059
RCMA420 Datasheets 328.5 KB ES2020/01/1010.01.2020D00059
RCMA420 Datasheets 527.2 KB ZH2019/05/1313.05.2019D00059
XM420-Schnittstellenoptionen Datasheets 264.1 KB DE2019/05/1313.05.2019
XM420 interface options Datasheets 223.5 KB EN2019/05/1313.05.2019D00051
Elektrische veiligheid bij statische omvormers conform NEN1010 Application brochures 153.5 KB NL2019/05/1313.05.2019
Elektrische veiligheid bij voertuigen conform NEN1010 Application brochures 287.9 KB NL2019/05/1313.05.2019
RCMA420 Quickstarts 511.6 KB DE2023/11/1616.11.2023D00059
RCMA420 Quickstarts 511.6 KB EN2023/11/1616.11.2023D00059
Changed variants of relays from goldplated to silver-plated contacts Technical information 166.3 KB EN2022/06/2727.06.2022
Geänderte Relaisvarianten von vergoldeten Kontakten auf versilberte Kontakte Technical information 166.3 KB DE2022/06/2727.06.2022