First, a safety note
A breaker that trips is doing its job — it's protecting you from a fault that could otherwise cause a fire or electric shock. Don't keep resetting a breaker that keeps tripping. If it trips repeatedly within minutes, or won't reset at all, leave it off and call an electrician.
The three types of trip
Your DB board has two kinds of protective device, and they trip for different reasons.
| Device | What it protects against | What "tripped" looks like |
|---|---|---|
| Circuit breaker (MCB) | Overload (too much current on one circuit) and short circuit (live touching neutral or earth) | Switch flips to "off" position; the circuit goes dead |
| Earth-leakage unit (RCD / ELU) | Earth leakage — current going to earth, usually through a fault (or a person) | Test button pops; multiple circuits go dead simultaneously |
| Main switch | Total system overload | Whole house goes dark |
Knowing which one tripped narrows the cause down significantly.
Top 5 causes in SA homes
1. Overloaded circuit (most common)
Too many high-current appliances on one circuit. A kettle (2.2 kW), iron (1.8 kW) and microwave (1.0 kW) sharing a 16 A circuit will trip it the second the geyser switches on. Solution: spread the load across circuits, or have a new dedicated circuit installed for the highest-draw appliance.
2. Faulty geyser element
Geyser elements in SA fail constantly — hard water + 24/7 use means most need replacement every 4–8 years. When the element shorts internally, the geyser circuit trips. This is the #1 reason for "the breaker won't reset" calls in South Africa.
How to check: switch off the geyser breaker. Wait 30 minutes. Try to reset. If it holds with the geyser off but trips the moment you switch the geyser on, the element is almost certainly the problem.
3. Earth-leakage trip (RCD popping)
Earth leakage protection trips when current "leaks" to earth — usually through a damaged appliance or moisture in a circuit. Common SA culprits:
- An outdoor extension lead exposed to rain
- An old fridge or freezer with degraded insulation
- Garden lighting or pool pump after a wet period
- Water in the geyser drip tray or behind a wall
The diagnostic move: unplug every appliance on the affected circuits, reset the RCD, then plug appliances back in one at a time. The one that trips it is the culprit. Replace or have it repaired.
4. Surge / lightning damage
Eskom grid spikes and thunderstorms regularly damage SA wiring and appliances. A breaker that suddenly starts tripping after a big lightning event has likely had its protective coil damaged, or an appliance on the circuit has been surge-killed. An electrician will need to test the breaker itself and isolate the damaged appliance.
5. Loose connection in the DB board
Heat cycling over years can loosen terminal screws in the DB board, causing intermittent trips that don't correlate with any specific appliance. This is the most dangerous cause — loose terminals also cause overheating and arc faults that can start fires. Only an electrician should diagnose this, and ONLY with the main switch off.
Safe DIY checks (do these first)
- Switch every appliance on the affected circuit off, then reset the breaker. If it holds, plug appliances back in one at a time to find the bad one.
- Check whether an outdoor circuit was exposed to rain — wait for it to dry out, then try again.
- Switch the geyser off at the DB board. If everything else stays on for 30+ minutes, the geyser is the most likely culprit.
- Press the "Test" button on the earth-leakage unit (with nothing critical running). It should trip immediately. If it doesn't, the ELU itself is faulty and needs replacement.
Don't attempt: opening the DB board cover; tightening terminals; replacing a breaker. These are all electrician jobs.
When to stop resetting and call an electrician
- Breaker trips again within seconds of being reset.
- Breaker won't reset at all (the lever springs back to off).
- You see, hear or smell anything unusual at the DB board — buzzing, scorch marks, plastic smell, warm covers.
- The earth-leakage unit trips even with the test button alone (no appliances connected).
- Multiple circuits tripping intermittently with no obvious cause.
- You feel a slight tingle from a tap, sink, or metal surface — this is current finding earth through plumbing and is a serious shock hazard. Switch off the main and call immediately.
Prevention — what actually works
- Replace the geyser element preventatively every 5–6 years. R400–R800 in parts; 1 hour of labour. Far cheaper than the burst-flood it prevents.
- Install plug-in surge protection on sensitive appliances (TV, computer, fridge). R200–R600 per outlet.
- Have a panel-level surge protector fitted at the DB board if you live in a high-lightning area like Gauteng. R1,500–R3,500 installed.
- Get a COC inspection every 5 years, even if you're not selling. Loose connections and degraded insulation are caught before they become fires.
- Test the earth-leakage unit monthly using the test button. If it doesn't trip when tested, replace it — it isn't protecting you any more.
Tripping circuits that keep coming back? Get free quotes from up to 3 wireman-licensed electricians — most can attend within 24 hours.