Why do breakers keep tripping?
Breakers trip because a circuit is drawing more current than it's rated for. The three most common causes are an overloaded circuit (too many devices on one circuit), a short circuit (hot wire touching neutral or ground), or a failing breaker that trips under normal load. Occasional tripping is normal; repeated tripping on the same circuit means you need an electrician.
- ›Overloaded circuit — too many appliances on one 15 or 20-amp circuit
- ›Short circuit — damaged wiring causing a direct fault
- ›Ground fault — current leaking to ground (common near water)
- ›Worn breaker — older breakers lose their rated capacity over time
- ›Undersized panel — a 100-amp panel can't support a modern home's load
Why Breakers Trip: The Basics
A circuit breaker is a safety device. When it detects more current flowing through a circuit than that circuit is designed to handle, it 'trips' — cutting power to prevent the wiring from overheating and potentially starting a fire. A breaker that trips occasionally after you've plugged in too many things is doing exactly what it's supposed to do. A breaker that trips repeatedly, or one that trips without an obvious cause, is telling you there's a problem that needs attention.
The Three Main Causes of Tripping Breakers
There are three primary reasons a breaker trips: overloaded circuit, short circuit, or ground fault. Each has different causes and different solutions.
1. Overloaded Circuit
An overloaded circuit is the most common cause of tripping breakers. It happens when you draw more current from a circuit than it's rated for. A 15-amp circuit can safely handle about 1,800 watts of continuous load. If you're running a space heater (1,500W), a hair dryer (1,800W), and a microwave (1,200W) on the same circuit, you'll trip the breaker. The fix is to redistribute the load — plug high-draw appliances into different circuits, or have an electrician add a new circuit.
2. Short Circuit
A short circuit happens when a hot wire touches a neutral wire, creating a path of very low resistance that allows a large amount of current to flow instantly. This trips the breaker immediately and often causes a burning smell or visible damage to the outlet or switch. Short circuits can be caused by damaged wiring, a faulty appliance, or loose connections. This is more serious than an overload and requires professional diagnosis.
3. Ground Fault
A ground fault is similar to a short circuit but involves a hot wire contacting a ground wire or a grounded surface. Ground faults are particularly dangerous in wet areas (kitchens, bathrooms, outdoors) because they can cause electrocution. GFCI outlets and breakers are designed to detect ground faults and trip faster than a standard breaker. If your GFCI outlet keeps tripping, there's a fault on the circuit that needs to be found.
Other Causes of Tripping Breakers
Beyond the three main causes, breakers can also trip due to a failing breaker (breakers wear out over time and can become overly sensitive or fail to hold), an arc fault (loose connections that cause arcing — AFCI breakers are designed to detect these), or a problem with an appliance (a failing motor or compressor can draw excessive current).
When Should You Call an Electrician?
You should call an electrician if: a breaker trips repeatedly without an obvious overload cause, a breaker trips immediately when reset, you notice a burning smell near the panel or an outlet, the breaker or panel feels warm to the touch, or you've had a short circuit (visible damage, burning smell, or the breaker won't reset). Don't repeatedly reset a breaker that keeps tripping — you're bypassing the safety mechanism.
Can I Replace a Tripping Breaker Myself?
Technically, replacing a breaker is within the ability of a handy homeowner, but it involves working inside the electrical panel where dangerous voltages are present even with the main breaker off. We strongly recommend having a licensed electrician replace breakers — not because it's impossibly complex, but because the consequences of a mistake are severe.