Why does my Circuit Breaker Keep Tripping when I Use the Microwave?

When your circuit breaker trips specifically when you use the microwave, it is most commonly due to an overloaded circuit.

Microwaves are high-wattage appliances that draw significant power. If other devices are running on the same circuit simultaneously, the cumulative demand can exceed the breaker’s amperage rating, causing it to trip to prevent the wires from overheating.

To address this issue, you can try the following steps:

• Redistribute appliances: Move other high-draw devices to different circuits so the microwave is not competing for power.
• Isolate the device: If the breaker trips even when the microwave is the only thing running, the microwave itself may be faulty or drawing more current than the circuit can safely supply.
• Check for short circuits: If the breaker trips instantly the moment the microwave starts, it could indicate a short circuit—a more dangerous condition where wires are touching.
• Consider a dedicated circuit: For older homes in Altadena, modern power demands often require a panel upgrade or the installation of a dedicated circuit specifically for the microwave to ensure long-term reliability.

If the tripping persists, it is a safety warning that should not be ignored. You should contact a licensed electrician to perform a load calculation and ensure your wiring meets modern safety codes.

• Circuit Breaker Keeps Tripping: Complete Troubleshooting Guide