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.
Quick Answer
GFCI = shock protection (people). AFCI = arc-fault fire protection. Need both in a location? Use a dual-function breaker. Always match the breaker to your panel brand/type and confirm where each is required for your project.
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.
How to Choose
1. Confirm what protection the location requires (GFCI, AFCI, or both). 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/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
Sources and Further Reading
- Electrical Safety Authority (Ontario) — https://esasafe.com/
- Manufacturer (Siemens) breaker/panel compatibility documentation — link per product
- CSA Group product listing — https://www.csagroup.org/testing-certification/product-listing/
Call to Action
[CTA: Need the right breaker for your panel? Send Maple your panel brand and circuit details and we'll match GFCI, AFCI, or dual-function options.] Schema: Article + Breadcrumb + FAQPage. Council gate: do NOT advance past "Draft written" until licensed/safety review is complete.
