GFCI vs AFCI Breakers: What Each Protects and How to Choose
GFCI breakers protect people from shock; AFCI breakers protect against arc-fault fires. Here's the difference, where each is typically required, and what to check for breaker/panel compatibility before you buy.
GFCI = shock protection (people). AFCI = arc-fault fire protection. Need both in one location? Use a dual-function breaker. Always match the breaker to your panel brand and type, and confirm where each protection is required for your project with a licensed electrician.
Who this guide is for
Electricians and informed homeowners selecting breakers for a panel, renovation, or upgrade.
What they do
- GFCI breaker: trips when it detects current leaking to ground (shock risk) — common around water and exterior areas.
- AFCI breaker: trips when it detects an arcing fault (fire risk) — common for living-area circuits.
- Dual-function: both protections in one breaker.
Canadian safety / approval notes
This guide is for product education and project planning only. Electrical work must follow the applicable Canadian Electrical Code, provincial requirements, manufacturer instructions, and inspection requirements. Breaker installation should be performed by a Licensed Electrical Contractor. Where GFCI/AFCI protection is required is determined by code and your authority having jurisdiction (in Ontario, the ESA).
How to choose
1. Confirm what protection the location requires (GFCI, AFCI, or both) with a licensed electrician. 2. Match the breaker to your panel brand and type — breakers are not universally interchangeable. 3. Choose receptacle-type vs breaker-type protection based on the install. 4. Verify amperage and pole count for the circuit.
Comparison table
| GFCI Breaker | AFCI Breaker | |
|---|---|---|
| Protects | People (shock) | Property (arc-fault fire) |
| Detects | Ground fault | Dangerous arcing |
| Typical areas | Wet/exterior/water-adjacent | Living-area circuits |
| Combine? | Dual-function does both | Dual-function does both |
Common mistakes
Assuming any breaker fits any panel · using GFCI where AFCI is required (or vice-versa) · ignoring dual-function options · buying a breaker brand incompatible with the panel.
Related products
Breakers & Panels (Siemens) · GFCI Receptacles & Devices (Leviton)
When to call a licensed electrician
For panel work, breaker installation, and confirming where GFCI/AFCI protection is required — always use a Licensed Electrical Contractor.
Frequently asked questions
What's the difference between a GFCI and an AFCI breaker?
A GFCI (ground-fault circuit interrupter) protects people: it trips when it senses current leaking to ground, the kind of fault that causes electric shock. An AFCI (arc-fault circuit interrupter) protects property: it trips when it detects the dangerous arcing that can start a fire. They guard against different hazards, which is why some locations need both.
Where does the Canadian Electrical Code require AFCI protection?
The Canadian Electrical Code requires AFCI protection on many residential circuits, and the specifics are updated edition to edition and can vary by province and local amendment. Rather than rely on a general rule, confirm exactly where AFCI (and GFCI) protection is required for your project with a licensed electrician and your authority having jurisdiction (in Ontario, the ESA).
Do I need a dual-function (GFCI/AFCI) breaker?
A dual-function breaker combines both protections in one unit, which is the simple answer when a location calls for shock protection and arc-fault protection on the same circuit. Whether your specific circuit needs one, the other, or both is a code decision — have a licensed electrician confirm it before you buy.
Will any GFCI or AFCI breaker fit my panel?
No. Breakers are not universally interchangeable — they must match your panel's brand and type, and using a breaker that isn't listed for the panel is unsafe and won't pass inspection. Check the panel's label and the manufacturer's compatibility documentation, and send Maple your panel brand and circuit details if you want help matching the right product.
Can I install a breaker myself?
Maple is a supply house, not an electrical contractor, so we don't give wiring instructions. Installing or replacing a breaker means working inside a live panel, which is electrical work that should be done by a Licensed Electrical Contractor — in Ontario that also means ESA involvement. We help you choose and source the right breaker; your electrician installs it.
Sources and further reading
- Electrical Safety Authority (Ontario): esasafe.com
- Manufacturer (Siemens) breaker/panel compatibility documentation
- CSA Group product listing: csagroup.org/testing-certification/product-listing
Not sure which breaker your panel needs? Send Maple your panel brand and circuit details and we'll match GFCI, AFCI, or dual-function options. Ask Maple
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