How to Fix a Broken Circuit Breaker: Step-by-Step Guide

Quick Answer

Fixing a circuit breaker: (1) If it tripped (flipped to OFF or middle): turn off or unplug devices on that circuit, then push the breaker firmly to OFF, then back to ON. (2) If it trips again immediately: a short circuit exists — unplug everything on the circuit and reset; if it still trips with nothing plugged in, the wiring has a short. (3) If it holds but trips under load: the circuit is overloaded — redistribute high-draw appliances to other circuits. (4) If the breaker won't reset, snaps back to the off position on its own without a load, or has scorch marks or burn smell: the breaker itself has failed and needs replacement. Breaker replacement: turn off the main breaker, remove the panel cover, pull the old breaker off the bus bar (push in, then out), snap in the matching replacement breaker (same brand, amperage, and pole count). Never replace a breaker with a higher-amperage one — this defeats the circuit protection.

Frequently Asked Questions

What is the difference between a tripped breaker and a bad breaker?

A tripped breaker has switched to the middle or off position due to an overload or fault and can be reset. A bad breaker fails to hold after resetting, trips immediately, feels hot to the touch, or shows visible burn marks, and must be replaced.

Is it safe to replace a circuit breaker myself?

Replacing a branch circuit breaker is a task many careful DIYers handle. The main lugs at the top of the panel remain energized even with the main breaker off, so you must work methodically and avoid touching them. If you are uncomfortable working near live wires, hire a licensed electrician.

How do I know which amperage breaker to buy?

Match the amperage stamped on the handle of the old breaker (15A, 20A, 30A, etc.) and the brand. Breakers are brand-specific and are not interchangeable between panel manufacturers.

Why does my breaker keep tripping?

Repeated tripping usually means the circuit is overloaded with too many devices, a single high-draw appliance is exceeding the breaker rating, or there is a wiring fault (short circuit or ground fault) somewhere on the circuit.

Can a bad breaker cause a fire?

Yes. A breaker that fails to trip under overload or fault conditions can allow wiring to overheat. Replace any breaker that shows signs of arcing, burning, or that fails to trip or hold correctly.

Do I need a permit to replace a single breaker?

Requirements vary by municipality. Many jurisdictions allow homeowners to replace like-for-like breakers without a permit, but a panel upgrade or subpanel work almost always requires one. Check with your local building department.

When a circuit breaker trips, it is doing its job — protecting your home’s wiring from overload or fault. Resetting a tripped breaker takes about 10 seconds. Replacing one that has gone bad takes around 20 minutes. Both are manageable DIY tasks if you approach them methodically and respect the fact that parts of your electrical panel remain live at all times.

Safety First: Understanding What Stays Energized

When you turn off your main breaker, the large service wires (main lugs) feeding power into the top of the panel remain energized at all times — only the utility company can de-energize those. You are working near live 240-volt conductors. This does not make the job impossible, but it means you keep tools and hands away from the top of the panel at all times.

Part 1: Resetting a Tripped Breaker

Step 1: Identify the Tripped Breaker

Open your panel door. A tripped breaker sits in the middle position between ON and OFF, or may have flipped fully to OFF. Some brands show a red indicator window when tripped.

Step 2: Find and Reduce the Load

Before resetting, go to the circuit and unplug or turn off high-draw devices — space heaters, window ACs, hair dryers. If something caused the overload, resetting without addressing it just trips the breaker again immediately.

Step 3: Reset

Push the breaker handle firmly to the OFF position until you feel or hear a click. Then push it firmly back to ON. A healthy breaker will stay on. If it trips again within seconds, you have either a persistent overload or a wiring fault — do not keep resetting it.

Part 2: Replacing a Failed Breaker

What You Will Need

Replacement breaker (same brand, same amperage as original)
Flathead and Phillips screwdrivers
Non-contact voltage tester
Needle-nose pliers
Electrical tape
Flashlight or headlamp

The Klein Tools Non-Contact Voltage Tester is an essential safety tool for any electrical work — always verify a wire is de-energized before touching it.

Step 1: Turn Off the Main Breaker

Flip your main breaker to OFF. This cuts power to all the branch circuit breakers but again, does not de-energize the main lugs at the top. Use your non-contact tester to verify the wires connected to the breaker you are replacing show no voltage.

Step 2: Remove the Panel Cover

Remove the screws around the panel cover plate and set it aside carefully. You now have access to all the branch breakers. Identify the failed breaker by position and label.

Step 3: Disconnect the Circuit Wire

Loosen the screw terminal on the bad breaker and remove the circuit wire (typically black for a 15A or 20A single-pole breaker). Move it aside and tape the end temporarily.

Step 4: Remove the Old Breaker

Single-pole breakers snap into the bus bar. Grip the breaker and rock it outward firmly — away from the center bus bar — while pulling slightly toward you. It will unclip with a firm pop. Do not pry against the main lugs or any other wiring.

For a reliable replacement, the Square D QO115 15-Amp Single-Pole Breaker or equivalent Eaton, Siemens, or Leviton breaker for your panel brand is available at most home centers.

Step 5: Snap In the New Breaker

Orient the new breaker the same way as the old one and press it firmly onto the bus bar until it clicks into place. The bus bar tab must engage the notch on the back of the breaker fully.

Step 6: Reconnect the Circuit Wire

Insert the circuit wire into the terminal screw of the new breaker and tighten it firmly. Give the wire a gentle tug to confirm it is secure. Loose connections in breaker panels are a leading cause of arc faults.

Step 7: Restore Power and Test

Replace the panel cover and secure the screws. Turn the main breaker back to ON, then flip the new branch breaker to ON. Test outlets and fixtures on that circuit to confirm everything is working.

If you find multiple breakers failing, notice burning smells, or discover scorched wiring in your panel, stop and call a licensed electrician. A panel inspection service kit can also help you do a basic visual audit before a pro visit.

When to Call an Electrician

The replacement breaker also trips immediately
You see scorch marks, melted insulation, or smell burning
The panel is older Federal Pacific or Zinsco brand (known fire risks)
You need to add a breaker rather than replace one (requires load calculation)

⏰ PT1H 💰 $10–$30 🔧 Voltage tester (non-contact), Replacement circuit breaker (same brand and amperage), Flathead and Phillips screwdrivers, Rubber-soled shoes or rubber mat, Flashlight

Understand what stays energized
Even with your main breaker off, the large service wires (main lugs) feeding into the top of the panel remain live. Never touch these wires or the areas directly above the main breaker.
Reset a tripped breaker
Open your panel door. A tripped breaker sits in a middle position between ON and OFF. Push it firmly to OFF first until it clicks, then push it back to ON. A tripped breaker that will not reset, or that trips again immediately, indicates a wiring fault that must be resolved before proceeding.
Identify a failed breaker requiring replacement
A breaker that trips repeatedly under normal load, refuses to reset, or has physical damage (scorch marks, burning smell) needs to be replaced. Purchase an exact replacement — same brand, same amperage as the original.
Replace the breaker
Turn the main breaker off. Remove the panel cover. Pull the old breaker out of the bus bar by rocking it toward you. Disconnect the circuit wire from the screw terminal. Connect the circuit wire to the new breaker, then push the new breaker firmly onto the bus bar until it seats. Replace the cover and restore power.