Built-in Residual Current Protection – Technical Guide
Scope of Protection
The NexBlue EV charger incorporates a built-in residual current protection mechanism designed to detect both AC and DC leakage currents under defined installation conditions.
Built-in Residual Current Protection Functionality
- The built-in residual current protection continuously monitors residual current during operation.
- Power supply is disconnected when residual current exceeds 30 mA AC or 6 mA DC.
- Tripping behavior and response time are in accordance with IEC 60947-2 Annex M and IEC 62955.
- Before each charge or at least every 24 hours, the built-in residual current device will automatically perform a self-check.
- A manual check can be carried out via the NexBlue Installer App together with the test button at the bottom right.
- The built-in residual current protection functions independently and does not replace or affect upstream protective devices.
Installation Considerations and External RCD Requirements
The presence of built-in residual current protection in the NexBlue charger does not eliminate the requirement for an external RCD where mandated by installation conditions or local regulations.
An external RCD shall be installed if one or more of the following installation conditions exist:
- Components of the installation (including wiring or junction boxes) provide basic insulation only (Class I).
- Other electrical loads, such as lighting or socket outlets, are connected to the same supply circuit.
- Local regulations, grid operator rules, or the assessment of the authorized installer require additional protection.