Why Does My Circuit Breaker Keep Tripping? 7 Common Causes

Few things are more annoying than a breaker that won’t stay on. The good news is that tripping is your electrical system doing its job — protecting you. The trick is working out why.

Here are the seven most common causes I find, roughly in order.

1. An overloaded circuit

Plug too much into one circuit — heaters, kettles, tumble dryers — and it can draw more current than it’s rated for. The breaker trips to prevent overheating. If it trips when you switch on a specific high-power appliance, this is a likely culprit.

Quick test: unplug things on that circuit, reset, and reintroduce items one at a time.

2. A faulty appliance

A failing kettle, washing machine or even a phone charger can develop a fault that trips the circuit — often an earth fault that trips the RCD. If the breaker trips the moment a particular appliance is plugged in or switched on, that appliance is the prime suspect.

3. A genuine earth fault in the wiring

Moisture, a damaged cable, or a deteriorating connection can let current leak to earth. RCDs are designed to detect this and trip fast. This one needs proper testing to locate — it’s not a guessing game.

4. A short circuit

A live conductor touching neutral or earth causes a sudden surge and an instant trip. Common causes include damaged cables, rodent damage, or a faulty accessory. A short circuit should always be investigated properly — don’t just keep resetting it.

5. Water ingress

Outdoor sockets, bathroom extractor fans and garden lighting are common offenders, especially after heavy rain. Water and electricity don’t mix, and your RCD knows it.

6. An overloaded or ageing consumer unit

Older fuse boards, or boards without proper RCD protection, can become unreliable. Sometimes the breaker itself is worn. If your board is decades old, it may be worth assessing.

7. A nuisance-tripping RCD

Sometimes several small leakages across different circuits add up and trip a single RCD that protects them all. The fix is proper testing to identify and redistribute or repair the offending circuits.

When to call an electrician

Call someone if:

• The breaker trips immediately every time you reset it.
• You notice a burning smell, scorch marks, or buzzing.
• Tripping is random and you can’t link it to an appliance.
• The consumer unit itself feels warm or looks damaged.

A burning smell from a socket, switch or the consumer unit should be treated as urgent. Stop using the circuit and get it checked.

This is exactly the kind of methodical fault finding I do day to day. If you’re in Central Scotland and a breaker won’t behave, get in touch or request a quote and I’ll track down the root cause — not just treat the symptom.