• Is an external type-A 30mA RCD still needed, when there is built-in type-A 30mA and DC 6 mA protection at an EV charger?


    Over the past years, we have seen a clear trend of using RCD Type A and RDC-DD for home charging applications. Some EV charger manufacturers declare built-in type-A 30 mA and DC 6 mA residual current protection at their EV chargers. It is nice to have built-in type-A 30mA protection at EV chargers as back-up protective measures of the external type-A 30mA RCDs, but the external type-A 30mA RCDs shall not be removed.

  • How to select 6 mA DC RCM for mode-3 EV charging points


    6 mA DC RCM – officially named as residual direct current detection device (RDC-MD) according to IEC 62955 standard – has been widely used in mode-3 EV charging point. This article introduces how to select 6 mA DC RCM for mode-3 EV charging points.

  • Why is 6 mA DC RCM used in AC EV charging pile?


    6 mA DC RCM is not a new term for electricians and electronic engineers that have experiences in the EV charging business. This article introduces why a 6 mA DC RCM is requested in a AC EV charging pile.

  • What is a RDC-DD, RDC-MD and RDC-PD?


    Since the publishing of IEC 62955 standard in 2018, RDC-DDs have been widely used in Mode-3 EV charging to detect DC residual current. The author introduces the function of RDC-DDs and its classification as RDC-MDs and RDC-PDs. Moveover, the main-stream RDC-DD design for mode-3 EV charger is also introduced.

  • What type of RCD do I need for my EV charger?


    This article introduces how to select the right type of RCD installed outside the home EV chargers. Although EV chargers might be declared as type-A 30 mA RCD and RDC-DD, we strongly suggest to install a type-A 30 mA RCD in a water-proof distribution board next to the EV charger, in order to ensure the safety of every charging circle.

  • More than providing IEC 62955 6mA DC fault current sensors for European EV charger manufacturers


    BITUO openly shares its in-depth knowledge about RCD design and manufacturing, in order to help our customers deliver safe EV charging systems complying with IEC 60947-2 / IEC 61008-1 and IEC 62955