Breaker Keeps Tripping? Why It Happens and What to Do Next

A breaker that trips now and then is not broken. It is the circuit's protection doing what it was put there to do. When a breaker keeps tripping, though, something is causing it, and that cause matters far more than the trip itself.

Three kinds of current make a breaker open. Knowing which one you are dealing with tells you what you can check yourself and when the tripping has become a safety problem. Microwaves, hot tubs and arc fault breakers each have their own pattern, and those are covered further down. The rules and safety facts come from the Electrical Safety Authority (ESA), provincial and municipal fire safety pages, Ontario utilities and the equipment makers' own documents, all listed at the end.

Why does my breaker keep tripping? Overloads, shorts and ground faults

Eaton's guide to overcurrent protection, written around the Canadian Electrical Code, sorts the current that opens a breaker into three kinds. What separates them is the path the current takes.

Overload. More current than the circuit should carry, still flowing along its normal path through the wires and whatever is plugged in. Eaton puts most overloads at about 1.35 to 6 times normal current. ESA's power bar factsheet describes the household version: two high-load appliances, such as a space heater and a toaster, running at once on the same circuit.

Short circuit. Current that leaves the normal path altogether. Eaton notes that short-circuit current can be hundreds to thousands of times higher than normal operating current.

Ground fault. Current that also escapes the normal path, leaking toward ground. This is the fault a GFCI is built to catch, as explained further down.

A standard residential breaker handles the first two. Eaton explains that this kind of trip unit uses a bimetal and an electromagnet to provide overload and short circuit protection, with no specialty protection such as ground fault. The bimetal is the overload side. Eaton's breaker guide says it is heated by the load current, so it allows a long delay on a light overload and responds quickly to a heavy one.

That gives you a clue. A breaker that holds for several minutes and then trips once the heater has warmed up is acting like an overload. One that trips again the moment it is reset, before anything heavy is switched on, is not.

A tripping breaker is protection, not the problem

It is natural to blame the breaker, but it is usually the one part of the circuit that is working. ESA's August 2026 Toolbox Talk on fuse and breaker replacement, written for electricians, says that before an overcurrent device is reset or replaced, you should determine why it operated and correct the underlying cause. The same thinking applies in a house.

Resetting again and again has a cost of its own. ESA's factsheet on power bars and multi-plug devices states that once a breaker trips, its ability to trip the next time is diminished, and that repeated resets will eventually leave it unable to trip, which defeats its safety purpose.

Two shortcuts are worth ruling out now, because neither one is a fix.

A bigger breaker or fuse. ESA's knob and tube flash notice counts putting 20 or 30 A fuses in place of 15 A fuses among unsafe practices, and Oshawa Fire Services tells residents not to tamper with fuse boxes or use the wrong size fuse. The trips stop because protection has been removed, not because the cause is gone. ESA's Toolbox Talk describes what follows when a breaker is swapped for a device that lacks proper overload and overcurrent protection: conductors and equipment may overheat or fail violently.

Taping, wedging or holding a breaker on. This does the same damage by hand. If a breaker will not stay on by itself, leave it off and stop using that circuit until someone qualified has checked it.

Is it dangerous if a circuit breaker keeps tripping?

It can be. The risk lies in whatever keeps causing the trips. ESA's Homeowner Electrical Safety Handbook groups circuits that frequently trip with overheated plugs or outlets and blown fuses, and says they point to an overloaded circuit or possibly faulty wiring or equipment, which can cause electrical shock or a fire hazard. ESA's May 2025 flash notice on residential electrical fires lists breakers that trip often as a warning sign and encourages homeowners to bring in a Licensed Electrical Contractor.

Even an overload that keeps coming back does harm. In a flash notice about portable air conditioners, ESA warns that continuous overloading of a circuit may lead to overheating, deterioration of wiring and devices, and a potential fire hazard or loss of power. Ottawa Fire Services keeps it simple: if a circuit breaker trips often, call an electrician before turning it back on.

Stop resetting and get help when a trip comes with a plug or receptacle that feels hot, when the breaker trips the instant you reset it, or when you cannot tell what set it off. Smoke, flames or sparking at the panel or an outlet means getting everyone out and calling 911.

What you can safely check before calling an electrician

A few steps are yours to take, and none of them involves removing the panel's cover or touching wiring.

1. Write it down. Note which breaker tripped, when, and what was running. A short log is the most useful thing you can give an electrician.

2. Unplug, then reset once. Unplug or switch off everything that was running on the dead circuit. Alectra Utilities explains that a tripped breaker has to be moved to the OFF position and then back to ON before it will restore power.

3. Spread the load. If the circuit holds, bring things back gradually and move heavy appliances to outlets on other circuits. ESA's power bar factsheet says multi-plug devices are not for relatively high-load appliances such as microwaves, toasters, irons and space heaters. Ontario's fire safety page tells homeowners to avoid overloading a circuit and to plug air conditioners and other heavy appliances directly into a wall outlet.

4. Watch for the pattern. Ottawa Fire Services lists having to unplug one appliance before plugging in another, because otherwise a breaker trips or a fuse blows, among the signs that a home's wiring should be inspected by an electrician.

If those steps show a circuit that is simply being asked to do too much, the real fix is more capacity where the load is. Ontario's fire safety page says additional outlets or circuits should be installed by a licensed electrician.

Why does my breaker keep tripping with nothing plugged in?

If everything on the circuit is unplugged and the breaker still trips, overload is off the list. Check one thing before you decide: unplugging does not disconnect anything wired in permanently, such as ceiling lights or a bathroom fan, so switch those off as well.

A breaker that trips with no load on it is reacting to something in the circuit itself, the faulty wiring or equipment that ESA's handbook warns about. It could be a short or a ground fault in a cable, a box, a fixture or a device, and finding it takes testing rather than guesswork. Leave the breaker off, stop using that circuit and book a Licensed Electrical Contractor, who can isolate the circuit, test it and trace the fault to where it starts.

Arc fault breaker keeps tripping: nuisance trip or real fault?

Arc fault (AFCI) and ground fault (GFCI) devices trip on conditions a standard breaker is not built to sense. An Ontario government fact sheet on farm wiring describes an AFCI as a type of circuit breaker able to detect dangerous levels of electrical arcing within the circuit it protects. What each device is and where the code calls for it is covered in our post AFCI vs GFCI: What Ontario Homeowners Need to Know. The question here is narrower: when one keeps tripping, is it a false alarm?

Sometimes it is. ESA describes nuisance tripping as an AFCI shutting off power without any evidence of an arc fault, and ties it to changes in technology and the difficulty of programming the devices. In ESA's podcast on these devices, a technical advisor names installation details that can set it off, such as connectors over-tightened on non-metallic sheathed cable and push-in connections at the back of a receptacle that sometimes fail. Those are wiring defects in their own right, so even a nuisance trip can lead back to work that needs fixing.

Plugged-in equipment can be the trigger too. ESA works with Electro Federation Canada to alert manufacturers when their equipment is involved in AFCI tripping, using a report that records the manufacturer, model and serial number of both the equipment and the breaker. Your log of what was running at each trip feeds directly into that.

Some breakers keep a record. Schneider Electric says the LED on its Square D QO and Homeline arc fault and dual function breakers helps identify ground faults, grounded neutrals and wiring issues, which gives the electrician a place to start testing.

A GFCI deserves the same benefit of the doubt. ESA's podcast explains that a GFCI compares the current going out on the hot conductor with the current returning on the neutral and trips on a difference of about four to six milliamps, a level judged safe for a person to be in contact with. The same advisor recalls block heaters constantly tripping early outdoor GFCI receptacles, and owners replacing the receptacles more than once, when the devices were in fact tripping for a reason.

Microwave keeps tripping breaker: why it needs a circuit of its own

ESA's power bar factsheet counts a microwave among relatively high-load appliances and warns that running two such appliances at the same time on one circuit may overload it and trip the breaker. If the breaker goes when the microwave runs alongside a toaster or space heater on the same circuit, that is an overload. For now, stop running them together on that circuit.

The lasting answer is a dedicated circuit. ESA's kitchen planning advice says all major appliances in a kitchen, including microwaves, require a dedicated outlet, and tells homeowners to consult a Licensed Electrical Contractor about the requirements. ESA's bulletin on kitchen receptacles gives a dedicated receptacle for a microwave oven as an example of a kitchen circuit that must have arc fault protection under Rule 26-658.

So when a microwave trips its own dedicated circuit with nothing else on it, sharing is not the cause. The circuit, its arc fault protection or the microwave itself needs testing by an electrician.

Hot tub breaker keeps tripping

A hot tub circuit has GFCI protection for a reason. ESA's bulletin on pools and hot tubs says Rule 68-068 requires electrical equipment within 3 m of the inside walls of a pool or hot tub to be GFCI protected, unless a fence, wall or other permanent barrier separates the equipment from the pool or tub area.

Start with the circuit. Hot Spring's pre-delivery instructions define a dedicated circuit as one not used or shared for any other electrical items, such as patio lights, appliances or garage circuits. The maker warns that overloading a shared circuit will result in nuisance tripping at the main panel, frequent resetting of the breaker and possible damage to spa equipment. Capacity counts too: Elexicon Energy's comparison of panel sizes says that if you plan to install a pool, hot tub, air conditioning or an EV charger, you will need a 200 amp panel.

Then the equipment. Hot Spring lists problems with the heating elements among the most common causes of hot tub GFCI trips, along with moisture inside the control box. Jacuzzi separates two patterns. A GFCI that trips immediately after reset often points to miswired neutral connections, neutrals shared with other circuits, or ground and neutral tied together incorrectly in the disconnect. Trips that come and go during use can mean a heater or pump developing a ground fault, moisture in the GFCI equipment or loose connections. For the first pattern, Jacuzzi's advice is to stop resetting and call a licensed electrician.

Your tub's manual covers its own troubleshooting steps. The supply circuit, the disconnect and the GFCI are electrical work under ESA's rules.

Who can repair a circuit breaker that keeps tripping

Testing a circuit, replacing a breaker, repairing a damaged cable and adding a dedicated circuit are all electrical work, and ESA's rules on who may do it are short. A homeowner may do electrical work in their own home after filing a notification with ESA. Friends, family members and neighbours cannot do it for you. If you hire someone, ESA says the only business that can be hired to do electrical work in your home is a Licensed Electrical Contracting business, and a handyman cannot do it without an electrical contractor licence. The contractor's ECRA/ESA licence number should be on its vehicles, business cards and estimates, and you can confirm it with ESA's contractor look-up tool.

KV Bear Electrical (ECRA/ESA 7014730) tracks down why a circuit will not stay on, repairs the fault and plans dedicated circuits for kitchens, hot tubs and other heavy loads, with the ESA notification filed for the work. Urgent calls get priority during business hours, Monday to Friday 7am to 6pm and Saturday 8am to 2pm. For fire, smoke or sparking, call 911, and for a power outage, call your local utility. To book a visit or request a quote, call 905-999-5048.