When and why to reset your main breaker
Your main circuit breaker sits at the top of your breaker panel and controls power to your entire house. You reset it the same way you reset any other breaker: flip the switch all the way to the OFF position, then back to ON. The main breaker trips when the total electrical load across all circuits exceeds your home's capacity — usually 100, 150, or 200 amps — or when a serious fault occurs in the main line itself.
Most homeowners never need to reset the main breaker during normal use. If it trips repeatedly, the problem is not the breaker; it is that you are drawing more power than your panel can handle, or there is a fault in your wiring or a major appliance. Resetting it over and over without finding the cause is a fire risk.
The one legitimate reason to flip the main breaker yourself is to cut power to the entire house before working on the panel or before an electrician arrives. If the main breaker has tripped on its own and will not stay in the ON position, call a licensed electrician — do not keep resetting it.
Key Takeaways
- The main breaker switch flips to OFF and back to ON just like any other breaker, and takes only a few seconds.
- If your main breaker trips once and stays on after reset, it was likely a temporary overload and is not a concern.
- If the main breaker trips repeatedly or will not stay on, the cause is either too much load on the panel or a fault in the wiring or a major appliance — resetting it repeatedly is unsafe.
- You should reset the main breaker yourself only to cut power before electrical work; otherwise, let an electrician diagnose why it tripped.
How to reset the main breaker safely
Before you touch the breaker panel, turn off or unplug any large appliances that were running when the breaker tripped — your water heater, air conditioner, electric oven, or clothes dryer. This reduces the load on the panel and makes it less likely the breaker will trip again when ready.
Open the breaker panel door. The main breaker is the largest switch, usually at the very top or bottom of the panel, and it controls two thick wires running into the panel from outside. Grasp the main breaker handle firmly and flip it all the way to the OFF position — you should feel it click and lock. Wait five seconds. Then flip it back to the ON position until it clicks and locks in place.
The breaker should now be on and power should be restored to the house. If lights come back on and appliances restart, the reset worked. If the breaker when ready trips again or will not stay in the ON position, stop — do not keep trying. Turn off the main breaker again and call an electrician.
What causes the main breaker to trip
The main breaker trips when the total current flowing through your panel exceeds its rating. If you run your air conditioner, electric water heater, and oven at the same time, you may hit that limit. The breaker is doing its job: it is protecting the wires in your walls from overheating and catching fire. Once you turn off one of those appliances, the load drops and the breaker can be reset.
A fault in the wiring or inside a major appliance can also trip the main breaker. If you notice the breaker trips every time you use a specific appliance — the dryer, the oven, the air conditioner — that appliance has a problem and should not be used until an electrician or the appliance manufacturer has checked it.
Damage to the main breaker itself is rare but possible. If the breaker trips when nothing unusual is running, or if it will not stay on after reset, the breaker may be failing and needs to be replaced by a licensed electrician.
When to call an electrician instead
Do not reset the main breaker more than once. If it trips a second time within a few hours, or if it will not stay in the ON position after the first reset, stop trying and call an electrician. Repeated tripping means something is drawing too much power or there is a fault in your wiring or a major appliance. Resetting the breaker over and over masks the problem and creates a fire hazard.
Also call an electrician if the main breaker is hot to the touch, if you smell burning plastic or rubber near the panel, or if you see scorch marks on the breaker or the panel itself. These are signs of a serious electrical fault that requires professional repair.
If you are uncomfortable opening the breaker panel or flipping the main breaker, there is no shame in calling an electrician to do it for you. A service call to reset a breaker is inexpensive and faster than troubleshooting a fire.
How to prevent the main breaker from tripping
Stagger the use of high-power appliances. Do not run your air conditioner, electric oven, and water heater at the same time if your panel is rated for 100 amps. If you have a 150 or 200 amp panel, you have more headroom, but the principle is the same: the more appliances running at once, the closer you get to the limit.
If you find yourself hitting the limit regularly — for example, you cannot run the air conditioner and the oven together — your home may need a panel upgrade. A 100 amp panel is common in older homes but is often too small for modern use. An electrician can assess your panel and tell you whether an upgrade is worth the cost.
Keep the breaker panel clear and unobstructed. Do not store boxes, tools, or anything flammable near the panel. Make sure the area around it stays dry and free of dust. A clean, accessible panel is easier for you to use in an emergency and easier for an electrician to work on.
Understanding your panel's amp rating
Your home's electrical panel is rated for a specific amount of current, measured in amps. Common ratings are 100, 150, and 200 amps. The higher the rating, the more appliances you can run at the same time without tripping the main breaker. You can find your panel's rating on the main breaker itself — it is printed on the handle or the switch body.
A 100 amp panel is typical in homes built before the 1980s. It is often too small for homes with electric heating, air conditioning, and modern appliances all running together. A 150 amp panel is standard in many homes built in the 1980s and 1990s. A 200 amp panel is common in newer homes and in homes with high electrical demand.
If you are planning to add a major appliance — a hot tub, a second air conditioner, an electric vehicle charger — check your panel's rating first. An electrician can tell you whether your panel has room for the new load or whether an upgrade is needed.
Frequently Asked Questions
Can I reset the main breaker myself or do I need an electrician?
You can reset the main breaker yourself — it is just a switch. Flip it to OFF, wait a few seconds, then flip it back to ON. If it stays on and power is restored, you are done. If it trips again when ready or will not stay on, call an electrician and do not keep trying.
What should I do if the main breaker is hot to the touch?
Do not touch it. A hot breaker means there is too much current flowing through it or the breaker itself is failing. Turn off the main breaker by flipping the handle with a wooden stick or tool if you must, then call an electrician right away. Do not use the panel until it has been inspected.
How long does it take to reset the main breaker?
Resetting the main breaker takes about 10 seconds — flip it off, wait a moment, flip it back on. Power is usually restored within a few seconds after that. If you are also turning off appliances first, add a minute or two for that.
Will resetting the main breaker erase my smart meter or smart home devices?
No. Resetting the main breaker cuts power to the house, but it does not erase data from your smart meter, smart thermostat, or other devices. Those devices have backup power or built-in memory and will resume normal operation once power is restored. You may need to reset the time on some devices.
Is it normal for the main breaker to trip during a thunderstorm?
It can happen. A lightning strike near your home or a power surge from the utility can trip the main breaker as a safety measure. If it trips once during a storm and stays on after reset, that is normal. If it keeps tripping, there may be damage to your wiring or meter, and you should call an electrician to inspect.