My Circuit Breaker Keeps Tripping — What's Causing It?

What Is a Breaker Keeps Tripping Problem?

A circuit breaker that trips once is protecting your circuit from a fault or overload. A breaker that trips repeatedly — even after being reset — is telling you that the fault is still present and that you need to find and fix it before using the circuit again.

Circuit breakers in South African homes are typically rated at 16A, 20A, or 32A for standard circuits. They're designed to trip when current exceeds their rating for a sustained period, or immediately in the event of a short circuit. They do not wear out from occasional correct operation, but they can become oversensitive with age, or they can fail to reset if a wiring fault remains on the circuit.

The key is to determine whether the breaker is tripping due to an overloaded circuit, a faulty appliance, or an actual wiring fault. Each requires a different response.

Common Symptoms & Warning Signs

• A specific breaker in the DB board repeatedly flips to the off position
• The breaker trips shortly after being reset — within minutes or hours
• The breaker trips when a specific appliance is turned on
• The breaker trips immediately on reset, not allowing any time before tripping again
• The same breaker has been tripping on and off for days or weeks
• Tripping is more frequent under certain conditions — when the geyser is on, during hot weather, or at night
• The breaker feels warm to the touch compared to adjacent breakers

What Causes a Breaker Keeps Tripping Issue?

• Overloaded circuit: The combined current draw of appliances on the circuit exceeds the breaker rating
• Short circuit: A live and neutral conductor are in direct contact, causing immediate and massive current flow
• Ground fault: A live conductor is touching an earthed surface, causing a sustained fault current
• Faulty or overloaded appliance: A single appliance is drawing more current than its nameplate rating due to an internal fault
• Damaged wiring: Insulation breakdown on cables caused by age, rodent damage, or physical damage is allowing fault currents to flow
• Aging breaker: After many operations over years, a breaker's internal spring mechanism may become oversensitive and trip below its rated current

Overload trips can often be resolved by reducing appliance load. Short circuit and ground fault trips require professional investigation to locate and repair the fault in the wiring.

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How Urgent Is This?

A breaker that trips occasionally when a specific heavy appliance is in use, and that resets without issue, is medium urgency. It suggests the circuit is at or near capacity and should be evaluated for an upgrade, but it's not an immediate danger.

A breaker that trips immediately on reset, or that trips persistently regardless of appliance load, indicates an active wiring fault. This is high urgency — the underlying short circuit or ground fault is generating heat in the wiring each time power flows, even briefly. Call an electrician the same day.

DIY vs Professional Repair

Homeowners can try switching off or unplugging all appliances on the tripping circuit before resetting, then reconnecting them one at a time to identify if a specific appliance is the cause. If the circuit holds with no appliances and trips when a specific one is connected, that appliance is the fault source.

If the circuit trips with no appliances connected, or if you cannot identify a specific appliance as the cause, you have a wiring fault that must be investigated by a registered electrician with insulation resistance testing equipment. Under SANS 10142, wiring fault repairs on fixed installations require proper compliance certification.

What Professionals Actually Do

The electrician will first disconnect all appliances and test the circuit with an insulation resistance tester to check whether the wiring itself is faulty. A healthy circuit will show very high resistance between live conductors and earth — a damaged circuit will show low or zero resistance indicating an insulation breakdown.

If the wiring tests healthy, appliances will be connected and tested one at a time under load to identify the culprit. The breaker will also be tested for correct trip calibration — if it's tripping below its rated current, it will be replaced with a correctly calibrated unit of the same rating.

Property Damage Risks

When a short circuit or ground fault causes a breaker to trip, the fault is still present in the wiring even after the breaker opens. Each time the breaker is reset and a small amount of current flows before the next trip, fault energy is dissipated at the fault location as heat. Repeated cycling of a wiring fault in this way can char insulation and start concealed fires.

An aging breaker that no longer trips at its rated current is a hidden danger — the circuit loses its overload protection, meaning the wiring can be continuously overloaded without the protective device operating. This can cause sustained overheating of circuit cables leading to insulation failure and fire.

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