Innovative technologies for safe handling of electrical power to achieve high availability

We offer you first-class quality and safety combined with global service and every support in resolving your monitoring problems.

  • Electrical safety for unearthed power supplies (IT systems)
  • Insulation monitoring equipment, insulation fault location systems
  • Power supplies for medical applications
  • Measuring and monitoring relays
  • Electrical safety for earthed power supplies (TN systems)
  • Using renewable energies efficiently: wind power, photovoltaics
  • Test systems for electrical equipment and medical technology


  • 6mA DC sensor, type A RCD sufficient
  • AC/DC sensitive residual current measurement
  • Fault current monitoring with external residual current transformer
  • Integrated fault memory (adjustable)

The AC/DC sensitive residual current monitoring module RCMB42… is used for residual current monitoring of AC charging stations for electric vehicles where direct or alternating fault currents are likely to occur, the value of which is constantly greater than zero.


  • DC sensor with additional AC tripping (type B characteristic)
  • Response value 2 – AC/DC 30 mA: r.m.s. measurement
  • Response value 1: DC 6 mA
  • Frequency range, residual current 0…2000 Hz
  • Frequency range, load current 45…65 Hz
  • Monitoring of the connection to the measuring current transformer
  • Shielded residual current transformer to prevent the effects of external disturbances
  • Connection by means of push-wire terminals
  • Variants: Single and two-channel residual current measurement


  • AC charge of electric and hybrid vehicles

LINETRAXX® RCMB42… Variant(s)

TypeMeasuring rangeFrequency
Number of measuring
current transformers
(ø 15 mm, 1.5 m Cable)
ChannelsSupply voltage USArt. No.
RCMB420-2DC 0…6 mA /
AC/DC 0…30 mA (r.m.s.)
0…2000 Hz22x residual currentAC 110…240 V, 50/60Hz /
DC 150…220 V
RCMB420-25DC 0…6 mA /
AC/DC 0…30 mA (r.m.s.)
0…2000 Hz22x residual currentDC 18…36 VB74042503
RCMB422-2DC 0…6 mA /
AC/DC 0…30 mA (r.m.s.)
0…2000 Hz11x residual currentAC 110…240 V, 50/60Hz /
DC 150…220 V
RCMB422-25DC 0…6 mA /
AC/DC 0…30 mA (r.m.s.)
0…2000 Hz11x residual currentDC 18…36 VB74042504

Delivery incl. measuring current transformers.
Measuring current transformer available with shorter cable on request (minimum order quantity 250 pcs).

Optional Accessories for LINETRAXX® RCMB42…

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

Downloads for LINETRAXX® RCMB42…

CE Declarations of conformity RCMB42x 83.5 KB 2022/08/12 06:17:2612.08.2022 06:17:26
Manuals RCMB42x 1.5 MB DE2021/08/31 10:44:4031.08.2021 10:44:40D00167
Manuals RCMB42x 1.5 MB EN2021/08/31 10:44:4031.08.2021 10:44:40D00167
Datasheets RCMB42x 1.4 MB DE2022/06/09 10:53:5809.06.2022 10:53:58D00167
Datasheets RCMB42x 1.4 MB EN2022/06/09 10:54:4009.06.2022 10:54:40D00167
Datasheets RCMB42x 599.1 KB ES2022/06/09 10:55:5209.06.2022 10:55:52D00167
Quickstarts RCMB42x 1,008.3 KB DE2021/08/31 10:07:2531.08.2021 10:07:25D00167
Quickstarts RCMB42x 1,008.3 KB EN2021/08/31 10:07:2531.08.2021 10:07:25D00167