A microwave trips the breaker due to overload, short circuit, or faulty wiring.
- Plug the microwave into a dedicated circuit and check the amp draw.
- Prevent trips by avoiding shared circuits and inspecting outlets regularly.
- Call an electrician if the problem persists or you notice heat or sparks.
Why does my microwave trip the circuit breaker?
A microwave draws high current, especially during startup. That surge can exceed the circuit's amperage rating. Most household circuits handle 15 or 20 amps. A typical microwave uses 10 to 15 amps, but startup can spike higher. If other appliances share the circuit, the total load exceeds the limit. A short circuit or ground fault also trips breakers. Loose wiring or a faulty outlet adds resistance and heat. Older breakers may be overly sensitive or worn out.
How to fix a microwave that trips the breaker
First, unplug the microwave and reset the breaker. Then, plug the microwave into a different outlet, preferably on a dedicated circuit. Check the microwave's wattage on the label. Calculate the amp draw by dividing watts by volts (usually 120). Ensure the circuit's amp rating is higher than the microwave's draw. Avoid using other high-power devices on the same circuit while the microwave runs. If the breaker still trips, inspect the power cord for damage. Test the outlet with a multimeter or plug in a lamp. If the outlet is faulty, replace it. If the microwave trips a known-good circuit, the microwave likely has an internal fault. In that case, stop using it and call a professional.
How to prevent microwave breaker trips in the future
Install a dedicated circuit for the microwave, especially if it's over 1000 watts. Use a 20-amp circuit for larger microwaves. Avoid running the microwave on the same circuit as refrigerators, toasters, or space heaters. Check the breaker's amperage and replace it if it's undersized. Regularly inspect the outlet and plug for scorch marks or looseness. Keep the microwave's vents clean to prevent overheating. If you live in an older home, consider upgrading the electrical panel. Always follow the manufacturer's installation instructions.
When should I replace the microwave or call an electrician?
If the microwave trips the breaker even on a dedicated circuit, it's likely faulty. Internal short circuits or damaged magnetrons require replacement. If the outlet or wiring is hot, discolored, or buzzing, call an electrician. A burning smell or visible sparks mean stop using the microwave immediately. If the breaker itself is old or frequently trips, have it inspected. Replacing a microwave is often cheaper than repairing it. For any electrical work, hire a licensed electrician. Never ignore repeated trips, as they pose a fire risk.