June 25, 2025

Why Does My Circuit Breaker Keep Tripping? 6 Common Causes & Fixes

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If your power keeps cutting out, chances are one of your circuit breakers is trying to tell you something. In this post, we’ll explore why your breaker might be tripping, the different types of devices in your switchboard, and what you can do to resolve the issue.

What Is a Circuit Breaker?

Modern switchboards in New Zealand typically contain three main types of protective devices:

MCB (Miniature Circuit Breaker)

Trips when there’s an overload (too many appliances on one circuit) or a short circuit (fault in an appliance or wiring).‍

RCD (Residual Current Device)

Protects against electric shock by tripping when current leaks to earth, often caused by faulty appliances or moisture.
Example: It’s common to see RCDs trip after water blasting the house exterior!

Why Does a Breaker Trip?

Occasionally, low-quality or deteriorated protective devices might trip without cause.

But in most cases, a breaker trips for a good reason. Here's what could be going on:

7 Common Reasons Your Breaker Keeps Tripping

1. Circuit Overload

Too many devices running at once = too much current draw.

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Signs: Power cuts out when using high-draw appliances (toaster, kettle, dryer).

Fix: Spread appliances over multiple circuits, or ask an electrician to add new circuits.

2. Short Circuit

Live and neutral wires make unintended contact.

Signs: Sudden breaker trip, burning smell, visible charring.

Fix: Unplug faulty appliances and do not use again until repaired.

If the short circuit is happening on hardwired parts of your system, shut off power at the main switch and call an electrician immediately.

3. Earth Fault

Live electricity touches an earthed surface (metal, pipework, or you!) and the RCD trips.
Common in bathrooms, kitchens, laundries and outdoor areas.

Fix: Unplug all appliances on that circuit.
If the RCD no longer trips, one of them is faulty. If it still trips, call an electrician.

4. Moisture or Water Ingress

Especially common in:

  • Outdoor lights
  • Outdoor air conditioner isolators
  • Power points exposed to weather

Result: Water causes earth leakage → RCD trips.

Fix: Usually requires an electrician. Wet devices are typically non-repairable and must be replaced.

5. Loose Connections or Faulty Wiring

Can cause intermittent tripping/power loss or over heating, increasing fire risk over time.

Fix: Requires inspection and repair by a licensed electrician.

6. Aging or Underrated Breakers

Old switchboards may not cope with today’s appliance loads.

Fix: Replace outdated protection, upgrade circuits and your switchboard to meet current safety standards.

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What Should I Do When the Breaker Trips?

Follow this step-by-step:
  1. Unplug anything that lost power.
    Anything that still has power can stay plugged in.
  2. Go to the switchboard. Try resetting the tripped device.
    • If it Stays On → One of the unplugged appliances was faulty.
    • If it trips Immediately → You likely have a short or leakage fault. Turn off power and get in touch with a qualified electrician in Auckland.
    • If it stays on for a while, then trips → You may have overload or low-level earth leakage. Professional diagnosis needed.

Important Safety Advice

  • Smell burning?
  • Suspect there is potential for someone to be exposed to live wires?
  • Feel uncertain about what’s going on?

Turn everything off at the main switch and call an electrician.

Also, never repeatedly reset a breaker
Multiple resets (more than 3-4) risk damaging the internal contacts, which could lead to fire or electric shock.

When to Call The Conduction Company

If you're in Auckland and scratching your head over why your power keeps cutting out, call The Conduction Company. Our team of licensed electricians and inspectors offer

  • Fast diagnosis
  • Same-day emergency callouts
  • Transparent advice and long-term solutions

Summary

If your circuit breaker keeps tripping, don’t ignore it

There is a problem and your switchboard is doing its job trying to keep you safe.

Whether it’s an overload, moisture, or a faulty appliance, identifying the cause early can prevent serious damage.

Start with a few basic checks.

But if the breaker keeps tripping - or you’re not confident - get professional help.

Reach out now!

Not sure why your breaker keeps tripping? Book a quick diagnostic visit with The Conduction Company today. Your safety is our priority.

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