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The residual current monitoring module RDC104-4, with patented measurement method, is used in combination with a measuring current transformer CTBC17 and a type A RCD which has to be provided in the installation for DC fault current monitoring of AC charging systems for electric vehicles in which AC or DC fault currents can occur. The rated voltage Un is 250 V and the rated current (charging current) In = 1 x 48 A/3 x 32 A. The RDC104-4 is suitable for integration into a charging unit Mode 3 (AC) as a RDC-M module according to IEC 62955.

The RDC104-4 is only intended for purchase by the manufacturer of the charging system and not for end users!

More information:


  • Three outputs (DC1, DC2, Error)
  • Patented measurement method (Patents: EP 2 571 128 / US 9,397,494 / ZL 201210157968.6 / CN 103001175, EP 2 813 856)
  • Measuring range DC ±300 mA
  • Residual current resolution 0.2 mA
  • Load current up to 48 A r.m.s. (single-phase) or 3 x 32 A r.m.s. (three-phase)
  • Fault output (integrated self monitoring and test functions)
  • High insensitivity to external interferences
  • Wide range of use even in severe environments (e.g. in the event of external magnetic fields)
  • As a RDC-M module in applications according to DIN EN 61851 or IEC 62955, the RCD104-4 can replace a type B RCD when combined with a type A RCD and a suitable switching device (e.g. a power relay).


  • DC fault current monitoring of AC charging systems for electric vehicles

RDC104-4 Variante(s)

TypeDescriptionArt. No.
RDC104-4RDC-M module acc. to IEC 62955B94042483
CTBC17Measuring current transformer Ø = 17 mmB98080070
CTBC17-Cable180MMConnection cable 180 ± 30 mmB98080540
CTBC17-Cable325MMConnection cable 325 ± 25 mmB98080541
CTBC17-Cable1470MMConnection cable 1470 ± 30 mmB98080542

Téléchargements pour RDC104-4

Manuels RDC104-4 Beiblatt 76.4 Ko DE2023/02/02 05:51:4502.02.2023 05:51:45D00402
Manuels RDC104-4 Supplementary sheet 76.4 Ko EN2023/02/02 05:51:4502.02.2023 05:51:45D00402
Manuels RDC104-4 2.1 Mo DE2021/11/17 06:42:0417.11.2021 06:42:04D00402
Manuels RDC104-4 2.1 Mo EN2021/11/17 06:42:0417.11.2021 06:42:04D00402
Notices RDC104-4 662.2 Ko DE2022/08/29 05:58:4029.08.2022 05:58:40D00402
Notices RDC104-4 657.4 Ko EN2022/08/29 05:58:5829.08.2022 05:58:58D00402
Informations techniques Stellungnahme Prüfung 6mA DC Fehlerstrom 450.2 Ko DE2022/06/07 12:37:3207.06.2022 12:37:32