Several appliances can add up on one circuit
The Department of Energy’s electrical-panel teaching example puts a kettle, microwave, and toaster on one 20-amp circuit to show how combined demand adds up. In a kitchen, the appliance you switched on last may simply have pushed a circuit that was already loaded. That does not mean the appliance is faulty, or that nearby outlets are on different circuits. Ask an electrician which outlets and equipment the circuit serves. Do not use extension cords or adapters to keep running a setup that trips.
Not every loss of power is the same kind of trip
The CDC and HUD Healthy Housing Reference Manual describes several kinds of protective devices, including circuit breakers, ground fault circuit interrupters (GFCIs) and arc-fault circuit interrupters (AFCIs), which respond to different conditions. If you do not know which device cut the power, describe what stopped working rather than guessing a cause. Do not remove covers, touch wiring, open the appliance, or recreate the trip to gather evidence.
Record what happened without testing it again
Write down the appliance in use, what else was running, which lights or outlets lost power, and whether it happened immediately or after a while. Note recent changes, such as a new appliance or a recent repair, and the appliance’s model information if you can read it without moving or opening it. Report any smell, sound, damaged cord or moisture you noticed. Do not touch a socket or cord to check whether it is hot.
The Philadelphia Fire Department’s fire-safety advice warns against overloading outlets and using frayed or damaged cords. If you see smoke or fire, leave and call 911. The CDC’s electrical-hazard guidance says that if you see sparks or frayed wiring, or smell something burning, you should shut off the electrical system at the main breaker, and that you should never operate electrical equipment while standing in water.
Do not install a bigger breaker
A larger breaker is not a fix for repeated trips. The Healthy Housing Reference Manual explains that the over-current device must be rated at equal or lower capacity than the wire of the circuit it protects, and advises using only the correct fuse size. Whether a circuit, device, connection or appliance needs work is for a professional to determine.
What to ask the electrician
Ask which protective device operated, what evidence supports the diagnosis, and whether the appliance needs separate service. Ask how the fix will be checked. If new wiring or a new circuit is proposed, ask which permit applies. Philadelphia’s Electrical Permit guidance says a licensed electrical contractor must perform electrical work; our checklist for hiring someone for a home repair covers how to check. More electrical questions are on our electrical and breakers page.