ABB Nuisance Tripping / High Leakage or Short Circuit

Charger trips the house RCD/GFCI or main breaker as soon as charging starts.

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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

Leakage current from EMI filters exceeding upstream RCD rating, Shorted output cable or connector, Incorrect use of additional external RCD with built-in RCD, Internal fault in power module

How to Fix / Troubleshooting

Shock and fire hazard: Do not repeatedly reset a tripping breaker without investigation.

  • Check RCD type: Ensure the upstream RCD is of the correct type and rating recommended by ABB (e.g., Type A or B, appropriate mA rating) and that you are not using redundant RCDs unnecessarily.
  • Inspect cable and connector: Look for visible damage or moisture. Dry thoroughly and replace damaged cables.
  • Test without vehicle: Power the charger with no vehicle connected. If the breaker still trips, the fault is internal to the charger.
  • Internal inspection (technician): A technician should test insulation resistance and check for shorts in the power module and RCD module.
  • Replace faulty module: Replace the power module or RCD module if they are found to be causing leakage or short circuits.
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Repair Difficulty

Hard 4/5

Required Part

RCD Module / Power Module
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