What it usually means, the likely causes in order, what to safely try first, what a pro charges in Canada, and when to stop and call one.
This guide covers the common cases. Describe your exact problem and get a personalized diagnosis — free to start, with a DIY vs. call-a-pro verdict and a real cost estimate.
A breaker that keeps tripping is doing its job - it is cutting power because the circuit is drawing too much current or because current is going somewhere it should not. One trip after plugging in a heater alongside everything else is an overload lesson. Trips that repeat, happen with nothing running, or come faster over time are the breaker reporting a fault: a dying appliance, a short in the wiring, or a breaker itself that has weakened. The diagnostic game is isolation - strip the circuit to nothing, reset once, then bring loads back one at a time until the culprit identifies itself.
A breaker that trips occasionally under an obvious heavy load can be managed by moving loads and booking a normal visit if it persists. It is urgent if the breaker trips instantly with everything unplugged, will not reset at all, feels hot, buzzes, or is joined by burning smells or sparking anywhere on the circuit. Never hold a breaker on, tape it, or keep resetting it - repeated resets into a fault cause real damage.
The most common and least sinister cause. Modern loads - space heaters, kettles, hair dryers, microwaves, tools - can stack on a general circuit faster than the home was designed for. The signature is timing: trips happen when a specific combination runs together and stop when loads are spread across different circuits.
Damaged insulation, a failed appliance, or moisture can let current take a path it should not. Shorts usually trip the breaker instantly and firmly, often the moment a specific device is switched on or plugged in, and they will trip again with the same device every time - that repeatability is the clue.
Motors and heating elements often fail progressively, drawing more current as they go. An appliance that has started tripping a breaker it lived happily on for years, especially one that runs hot, sounds strained, or trips after several minutes rather than instantly, belongs high on the suspect list.
Breakers age too. A breaker that trips well below its rating, feels loose, will not latch firmly, or trips with almost no load may be the fault rather than the messenger. Only an electrician working safely in the panel can confirm this - but it is why endless appliance-swapping sometimes finds no culprit.
| Job size | Typical estimate (CAD) |
|---|---|
| Simple fix — the straightforward version of this repair | $130–$280 |
| Major job — complex, hidden, or replacement-level work | $500–$2,500 |
Estimates only, calibrated to Greater Toronto Area trade rates and adjusted by region on this site — not a quote. Your exact price depends on the cause, parts, and access. A personalized diagnosis narrows this range using your specific symptom.
Load management is yours: unplugging, isolating a culprit appliance, and spreading heavy items across circuits are safe and often solve overload trips entirely. Everything else is pro work - a breaker that trips on an empty circuit, trips instantly, or needs replacement, and any short or ground fault in the wiring. An electrician can measure the actual draw, test insulation and the breaker, and tell apart an overloaded lifestyle from a deteriorating circuit, which are fixed in completely different ways.
Reset once after removing loads. If it trips again in the same pattern, further resets add heat and wear without adding information. A breaker that trips instantly with nothing plugged in should not be reset again at all until an electrician has checked the circuit - the trip itself is the diagnosis that a fault exists.
Probably nothing is broken - that is a textbook overload. Two high-draw appliances can exceed a general circuit rating together while each is fine alone. The fix is behavioural or structural: run them on different circuits, or have an electrician add a dedicated circuit if that combination is part of daily life in that room.
Never. The breaker rating is matched to the wire size in the walls. A larger breaker would let that wire carry more current than it can safely handle, moving the failure point from the panel into the wall. If a circuit is genuinely undersized for its loads, the correct fix is a new circuit with appropriate wiring, installed by an electrician.
Something changed: a new appliance, an existing appliance failing and drawing more, a connection deteriorating, or moisture reaching a junction. Ask what is new on that circuit, including things that run automatically like a dehumidifier or a space heater on a timer. That change is usually the answer, and naming it speeds the repair.
Describe what's actually happening and get a personalized diagnosis — DIY vs. call-a-pro verdict, real cost estimate, and top-rated local pros.