For homeowners

Types of breaker: which one fits your home?

Choose Standard for protecting the branch circuit wiring (CPSC staff paper, c. 2000); GFCI for shock hazards; AFCI for fire hazards; Dual function (AFCI/GFCI) for both AFCI and GFCI protection in one unit. The right choice depends on whether the circuit needs shock protection, whether it needs protection from arcing in the wiring, and the age of the home's wiring.

How we know: By InstaBids editorial team with AI research agents. · Sources read: 17 October 2026 · Updated 27 October 2026

CPSC checklist, 2008: circuit breakers of every type must be exercised periodically to make sure they have not become stuck and to keep them in good working order.
Type	Best for	Main advantages	Main drawbacks
Standard	protecting the branch circuit wiring (CPSC staff paper, c. 2000)	CPSC staff engineers' paper, c. 2000 (the authors' views): its thermal trip uses a bimetal strip that heats up when current exceeds the rating	CPSC guide, 2012: household breakers do not respond to early arcing and sparking in home wiring; CPSC guide, 2012: by the time an ordinary breaker opens a circuit on those conditions, a fire may already have begun
GFCI	shock hazards	OSHA workplace guide, 2002: compares the current going into equipment with the current returning from it; OSHA workplace guide, 2002: interrupts the flow of electricity within as little as 1/40 of a second to prevent electrocution	U.S. Fire Administration report, 2008: GFCIs are not designed to protect against house fires; CPSC checklist, 2008: can fail without showing any sign of failure, so it needs regular testing
AFCI	fire hazards	CPSC checklist, 2008: detects arcing that may occur if a wire or connection is damaged; U.S. Fire Administration report, 2008: identifies arcing at cords, outlets and lights and trips before the arcing can start a fire; CPSC staff engineers' paper, c. 2000: built into a conventional circuit breaker, combining its overload and short-circuit protection with arc fault protection; CPSC guide, 2012: sometimes an existing breaker can be replaced with an AFCI in the existing electrical panel box	CPSC checklist, 2008: can stop working without showing signs of failure, so it needs regular testing; CPSC guide, 2012: have a qualified electrician install it; CPSC says not to attempt the work yourself
Dual function (AFCI/GFCI)	both AFCI and GFCI protection in one unit	Siemens (a maker) says its dual function breakers integrate both protections into a single device	Siemens (a maker) lists its dual function breakers in 1-pole, 15-20A versions

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How do I reset a tripped breaker?

For a GFCI circuit breaker, CPSC's home electrical safety checklist (2008) gives the reset as moving the breaker handle to the off position and then to the on position.

The same checklist (2008) tests a GFCI breaker by pushing its test button, after which the handle should go to the middle or off position, and it says a defective GFCI circuit breaker should be replaced by a qualified electrician.

Is it easy to replace an electrical breaker?

CPSC treats it as an electrician's job: its AFCI guide (2012) says to have a qualified electrician install AFCIs and not to attempt the work yourself.

The reason the guide (2012) gives is that the installation involves working within electrical panel boxes that are usually electrically live, even with the main circuit breakers turned off.

CPSC's checklist (2008) says the same of a defective GFCI or AFCI circuit breaker: it should be replaced by a qualified electrician.

How to size an electrical panel?

A factsheet hosted by DOE's Building Science Education Solution Center describes sizing as calculating the amperage load of all the various appliances and fixtures, then building in a margin of safety.

It adds that electricians recommend the load never exceed 80 percent of the electrical service capacity, and that you can find a panel's amperage rating on a label on the panel or from the size of its main breaker.

How many breakers can I put in a 100amp panel?

The DOE-hosted factsheet gives no fixed count: it says breakers typically add up to more than the capacity of the panel, so you cannot add up the breakers and subtract them from the panel rating.

It names two separate limits, physical space for more breakers and electrical space, and ENERGY STAR says empty slots in the panel show where new breakers for new electric loads can go.

If your priority is...
Priority	Choose
shock protection on a circuit that does not also need arc-fault protection	GFCI
arc-fault protection alone, for an older home's aging wiring	AFCI
shock and arc-fault protection on the same circuit	Dual function (AFCI/GFCI)

What does electrical panel replacement cost?

For electrical panel replacement prices, see How much does it cost to replace an electrical panel?

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Sources for the facts on this page

U.S. Consumer Product Safety Commission staff paper, New Technology for Preventing Residential Electrical Fires: AFCIs (undated, c. 2000), government, read 17 October 2026.
U.S. Consumer Product Safety Commission, Publication 5133 Preventing Home Fires: AFCIs (rev. 04/2012), government, read 17 October 2026.
U.S. Department of Labor, OSHA 3075 Controlling Electrical Hazards (2002, revised), government, read 17 October 2026.
U.S. Fire Administration (FEMA), Topical Fire Report Series Vol. 8 Issue 2 (March 2008), government, read 17 October 2026.
U.S. Consumer Product Safety Commission, Publication 513 Home Electrical Safety Checklist (July 2008), government, read 17 October 2026.
Siemens (manufacturer), Residential Dual Function Circuit Breakers product page, maker's own site, read 17 October 2026.
U.S. Department of Energy Building Science Education Solution Center, Home Electrification and Electric Panel Upgrades (factsheet by New Buildings Institute), government, read 22 October 2026.
ENERGY STAR (U.S. EPA and U.S. DOE), Make Your Home Electric Ready, government, read 22 October 2026.