KEBA Nuisance RCD Tripping / Leakage Current Issue

KEBA charger frequently trips the upstream RCD when starting or during charging

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Use of inappropriate RCD type (e.g., AC instead of A or B), High leakage from EV or cable, Moisture in socket, Internal filter capacitors causing inrush leakage

How to Fix / Troubleshooting

Safety first: Repeated RCD tripping indicates a potential safety issue. Do not simply upsize or bypass the RCD.

Steps:

  • 1. Verify RCD type: Check that the installed RCD matches KEBA's requirements (typically Type A with integrated DC detection in the charger, or Type B if specified).
  • 2. Inspect for moisture: Check the Type 2 socket and internal wiring for moisture or contamination that could increase leakage.
  • 3. Test with another EV: If tripping only occurs with one vehicle, have that EV inspected for insulation issues.
  • 4. Measure leakage (qualified person): Use appropriate instruments to measure leakage current during operation and compare with RCD rating.
  • 5. Replace RCD if faulty: If the RCD is overly sensitive or defective, replace it with a compliant device.

Follow KEBA's installation manual for recommended protective devices and wiring practices.

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Repair Difficulty

Hard 4/5

Required Part

Upstream RCD (External to Charger)
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