GFCI, AFCI, and dual-function breakers all look similar in the panel but protect against completely different hazards. Getting the wrong one fails inspection — and may not protect your people or your building.
Standard circuit breakers protect against overloads and short circuits — too much current, essentially. GFCI and AFCI breakers add layers of protection on top of that for specific hazard types the NEC has determined need dedicated detection.
A GFCI breaker monitors the difference in current between the hot and neutral conductors. If that difference exceeds about 5 milliamps — indicating current is leaking to ground, possibly through a person — it trips in under 1/40th of a second. GFCI protection is fundamentally about electrocution prevention in wet environments.
NEC 2023 requires GFCI protection for: bathrooms, garages, crawl spaces, unfinished basements, outdoor receptacles, kitchens within 6 feet of a sink, boathouses, and all 125V through 250V receptacles on construction sites.
An AFCI breaker detects the specific electrical signature of arcing — the kind that starts house fires inside walls where you can't see it. Arcing happens when wiring is damaged, connections are loose, or insulation is compromised. A standard breaker won't trip on a dangerous arc because it doesn't exceed the overcurrent threshold. An AFCI will.
NEC 2023 requires AFCI protection for virtually all 120V, 15A and 20A circuits in dwelling units — bedrooms, living rooms, dining rooms, hallways, kitchens, laundry areas, and more. This has expanded significantly with each NEC cycle.
Dual-function breakers provide both GFCI and AFCI protection in a single unit. They are required by NEC 2023 in locations where both requirements apply simultaneously — most commonly kitchen circuits and laundry circuits in new residential construction. They are also the cleanest solution when upgrading older panels to meet current code.
| Feature | Standard | GFCI | AFCI | Dual-Function |
|---|---|---|---|---|
| Overcurrent protection | ✓ | ✓ | ✓ | ✓ |
| Ground fault (shock) protection | ✗ | ✓ | ✗ | ✓ |
| Arc fault (fire) protection | ✗ | ✗ | ✓ | ✓ |
| Typical price range (15A) | $5–12 | $25–45 | $30–55 | $45–75 |
| Common use | General circuits | Wet areas | Living spaces | Kitchens, laundry |
All major breaker manufacturers produce GFCI, AFCI, and dual-function breakers — but they must be matched to your specific panel brand. You cannot install a Square D GFCI breaker in an Eaton BR panel. Cross-brand compatibility is a code violation and a safety issue.
Dual-function breakers have historically been in short supply, particularly during periods of heavy residential construction. Because they satisfy two NEC requirements simultaneously, demand has consistently outpaced supply from distributors during peak building seasons.
Contractors running multiple projects often find that local supply houses are out of stock on specific amperage and panel combinations. This is where competitive quote platforms become useful — multiple electrical suppliers bidding on the same request surface availability and pricing that a single distributor call won't reveal.
Post one RFQ on BreakerQuote and get competing quotes from verified electrical suppliers — no commissions, no markup.
Get Competing Quotes →GFCI and AFCI breakers have a pigtail (neutral wire) that connects to the panel's neutral bar — unlike standard breakers which only connect to the bus bar. This means installation takes a few extra minutes per breaker and requires attention to wiring. Dual-function breakers have the same pigtail requirement.
Nuisance tripping is a common complaint with AFCI breakers, particularly on older wiring. Some light dimmers, fluorescent ballasts, and uninterruptible power supplies can produce signals that AFCI breakers interpret as arc faults. If you're experiencing this, verify the breaker is the correct one for your panel and check for compatibility lists on the manufacturer's website before replacing equipment.
On a 20-circuit residential panel full replacement, the difference between standard breakers and dual-function breakers can run $600–1,200 in parts alone. On commercial projects with dozens of circuits, this becomes a significant line item that warrants competitive sourcing rather than defaulting to whatever the electrical supply house has on the shelf.
Buying through a distributor means paying list price or at best a modest contractor discount. Posting an RFQ to multiple suppliers simultaneously creates price competition that consistently produces better results — especially on quantities above 10 units of the same part number.
Match the breaker type to the NEC requirement for the specific circuit and location. GFCI for wet areas and shock hazards. AFCI for living spaces and fire hazard circuits. Dual-function where both apply or where simplicity is worth the cost premium. And regardless of which type you need, source competitively — these breakers carry significant markup at most supply houses.