How to Install an AFCI Circuit Breaker (Step-by-Step)
An AFCI (arc fault circuit interrupter) breaker installs almost identically to a GFCI breaker — both have a white neutral pigtail that must connect to the panel's neutral bar. If you've replaced a standard breaker
before, this is a straightforward upgrade. If this is your first time, the steps below walk you through everything.
Before you start
What you'll need:
- AFCI or combination AFCI/GFCI breaker (must match your panel brand)
- Flathead and Phillips screwdrivers
- Non-contact voltage tester
- Needle-nose pliers (optional)
Choosing the right AFCI breaker: AFCI breakers are panel-brand specific. Check your panel brand on the door or cover and match:
- Brand — Siemens, Eaton, Square D, ABB, etc. (not interchangeable)
- Amperage — same as the existing breaker (typically 15A or 20A for bedroom/living room circuits)
- Type — get a combination AFCI (CAFCI), which is what the NEC now requires. If the circuit also needs GFCI protection, get a dual-function AFCI/GFCI breaker instead
Browse AFCI circuit breakers (/collections/afci-arc-fault) — we stock combination-type AFCI breakers for all major panel brands.
Safety warning
The main bus bars inside your panel remain live even when the main breaker is off. Never touch the two large cables or terminals at the very top of the panel. If you're not comfortable working inside an electrical
panel, hire a licensed electrician.
Step 1: Turn off the main breaker and verify
Flip the main breaker to OFF. Use a non-contact voltage tester on the wire going to the breaker you're replacing — it should show no voltage. The bus bars will still be live; stay away from them.
Step 2: Remove the panel cover
Four screws, typically. Set the cover aside.
Step 3: Remove the old breaker
1. Loosen the screw on the breaker and remove the black (hot) wire
2. Rock the breaker away from the bus bar — pull toward you, then straight out — until it unclips
Step 4: Note the existing wiring
The black (hot) wire from the circuit connects to the breaker. On a standard breaker, the white (neutral) wire goes directly to the neutral bar in the panel. With an AFCI breaker, the white neutral wire will now
connect to a terminal on the breaker itself, and a pigtail from the breaker connects to the neutral bar instead.
Step 5: Prepare the new AFCI breaker
Your AFCI breaker comes with a white pigtail wire already attached. Don't remove it. Identify the terminals:
- LOAD terminal — where the black circuit wire connects
- NEUTRAL terminal — where the white circuit wire connects
- White pigtail — connects to the panel's neutral bar
Step 6: Install the AFCI breaker on the bus bar
Position the breaker at the correct slot. Hook onto one side first, then press down onto the bus bar clip. Push firmly until it snaps into place with no wobble.
Step 7: Connect the wires
1. Connect the black (hot) wire to the LOAD terminal. Tighten.
2. Disconnect the white (neutral) wire from the neutral bar where it's currently connected. Connect it to the NEUTRAL terminal on the AFCI breaker. Tighten.
3. Connect the white pigtail to any available screw on the panel's neutral bar. Tighten.
Check that all terminals are tight and no bare wire is exposed.
Step 8: Test
1. Replace the panel cover
2. Turn the main breaker ON
3. Press the TEST button on the face of the breaker, then press RESET, then move the lever to ON
4. Press TEST again — it should trip. Press RESET to restore.
5. Test the circuit to confirm power is working
If the AFCI trips immediately after reset with the circuit connected, see our guide on arc fault breaker keeps tripping (/blogs/news/arc-fault-breaker-keeps-tripping) for diagnostic steps.
Photo of "Eaton, BRP115AF, 1-pole, Circuit Breaker"
FAQ
Do I need to hire an electrician to install an AFCI breaker?
Not necessarily. If you're comfortable working inside an electrical panel and understand the safety precautions, an AFCI breaker installation is a straightforward DIY task. If you're unsure, hire a licensed
electrician.
Can I replace any standard breaker with an AFCI breaker?
Yes, as long as the replacement matches your panel brand and the circuit's amperage. Upgrading existing standard breakers to AFCI or combination AFCI/GFCI protection is a recommended upgrade for bedrooms, living rooms,
and any circuit in an older home.
What's the difference between AFCI and combination AFCI?
A standard AFCI detects arc faults only in the branch wiring between the panel and the first outlet. A combination AFCI (CAFCI) also detects arc faults downstream and in connected cords and devices. The NEC now
requires combination-type for all new installations.
My AFCI breaker trips as soon as I connect the circuit wires — what's wrong?
Either there's an active arc fault or wiring issue on the circuit, or a device is causing nuisance tripping. Disconnect all devices first and test — if the breaker holds with nothing plugged in, the issue is a specific
device. If it trips with no load, there's likely a wiring fault. See our guide on arc fault breaker keeps tripping (/blogs/news/arc-fault-breaker-keeps-tripping).