Zaptec External Protection Trip Under Load

Charger trips the house RCD or breaker as soon as a vehicle is plugged in, but no specific charger error is logged

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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

Shared RCD with other loads, Nuisance tripping due to combined leakage, Incorrect RCD type for EV charging, Fault in vehicle or cable causing leakage

How to Fix / Troubleshooting

Safety first: Repeated RCD tripping indicates a potential leakage issue. Do not bypass or replace with a higher rating without proper assessment.

Steps:

  • Isolate the circuit: Ensure the charger is on a dedicated circuit as per Zaptec and local regulations.
  • Test without vehicle: Turn on the breaker with no vehicle connected. If it holds, plug in the vehicle and observe.
  • Try another vehicle/cable: If tripping only occurs with one EV or cable, that item may be faulty.
  • Electrician checks: Verify RCD type (e.g., Type A with DC detection in charger, or Type B as required). Measure leakage currents and correct any wiring issues.
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Repair Difficulty

Hard 4/5

Required Part

Upstream RCD / Circuit Breaker (Installation Component)
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