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—What you are noticing

A breaker that trips when one appliance runs

When the same appliance trips the power every time, the question is simple: is it the appliance, or the circuit it is plugged into?

A breaker trips when more current flows than its circuit is designed for, or when a short circuit sends a sudden surge. An appliance that trips its breaker every time may simply draw more than that circuit can supply — a kettle and a toaster on the same kitchen circuit as an oven, for example — or it may have an internal fault.

This guide describes what people notice and what is safe to do. It does not diagnose your installation; only someone who has seen it can.

A safe test is to plug the appliance into a different circuit, ideally in another room, with little else running. If it trips there too, the appliance is the likely problem. If it works there, the original circuit may be overloaded or have a weak connection. Either way, repeated resetting is not the answer; the breaker is doing exactly what it was put there to do.

01In short

The points that matter most

  • Appliance or circuit

    Trying the appliance on another circuit separates the two.

  • Overload is common

    High-power appliances sharing one circuit can exceed its rating.

  • Leave it off after a second trip

    Repeated resetting can damage cables and connections.

02Detail

What gets checked

  • The appliance

    Its elements, motor and internal wiring for faults that draw excessive current.

  • The circuit load

    What else shares the circuit, and whether the appliance needs a circuit of its own.

  • The breaker

    Its rating and condition, and whether it is the right type for the load.

03Checklist

Note this first

  • Which appliance and which socket

    And what else was running on the same circuit.

  • Whether it trips elsewhere

    The result of trying it on another circuit.

  • Which device tripped

    A breaker or the RCD; they point to different causes.

04Questions

Questions people ask

Should I replace the breaker with a bigger one?
No. A larger breaker on the same cable removes protection; the circuit and load need assessing instead.
Why does the oven trip only when it heats up?
Faults in heating elements often appear only once they are hot.
Is it safe to keep using the appliance on another circuit?
Not if it trips there too. Stop using it until it has been checked.

05Related

Related guides

This guide sits under troubleshooting. All topics are on the guides page.

—NEXT

One appliance keeps tripping the power?

Tell us which appliance, which device trips and what happened on another circuit. We will suggest the next step.

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