Multiquip
Nuisance Breaker Trip on Motor Starting
Generator output breaker trips when large motor loads start
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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
Motor inrush current too high for generator size, Loose breaker connections, Weak or aged breaker, Incorrect breaker rating
How to Fix / Troubleshooting
Safety first: Open the generator main breaker and ATS before working on wiring. Use PPE when working on live circuits.
- Step 1 – Evaluate load: Identify large motor loads (HVAC compressors, pumps). Check their starting kVA against the generator's motor starting capability.
- Step 2 – Stagger starts: Configure controls so that large motors do not start simultaneously when on generator power.
- Step 3 – Inspect breaker and connections: Tighten breaker lugs and inspect for heat discoloration. Replace a breaker that shows signs of overheating or nuisance tripping.
- Step 4 – Consider soft‑start devices: For problematic motors, install soft starters or VFDs to reduce inrush current.
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Repair Difficulty
Hard
4/5
Required Part
Main Circuit Breaker
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