Wacker Neuson Overcurrent / Short Circuit Protection Trip

Generator main circuit breaker trips repeatedly under moderate load

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.

Possible Causes

Short circuit in load wiring, Undersized breaker for actual load, Internal alternator fault, Loose or damaged output cables

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a tripping breaker without finding the cause. Isolate the generator from the building before testing.

Inspect load circuits: Check building distribution for tripped branch breakers or signs of short circuits.
Measure load current: Use a clamp meter on each phase to verify actual current draw versus breaker rating.
Check output cables: Inspect generator-to-ATS cables for damage or overheating.
Alternator test: If the breaker trips with no load connected, the alternator may have an internal fault requiring professional service.

Repair Difficulty

Hard 4/5

Required Part

Main Circuit Breaker

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