GFCI Breaker
A circuit breaker that also cuts power when current leaks to ground.
Quick Answer
A GFCI breaker is a circuit breaker with built-in ground-fault circuit interrupter protection. It trips on overcurrent like any breaker and also trips when it detects current leaking to ground, to protect people from shock. It is installed in the panel and counted EA by ampere rating and poles.
The Full Picture
A ground-fault circuit interrupter is a device that de-energizes a circuit when current to ground exceeds a predetermined value, set below what would trip the ordinary overcurrent device. The U.S. Consumer Product Safety Commission explains that a GFCI monitors current on a circuit and, if the current going out differs from the returning current by as little as 0.006 amperes, cuts power. CPSC notes that this protection comes as GFCI receptacles, GFCI circuit breakers and portable units.
Choosing the breaker over the receptacle is a design and cost choice. A GFCI breaker sits in the panel and protects the whole circuit, including all the outlets and wiring on it, while a GFCI receptacle protects the receptacle and anything wired downstream of it. A breaker is a good fit where many outlets share a circuit or the outlets are hard to reach. Code decides which locations need protection, such as bathrooms, kitchens, garages, exterior outlets and areas near water, and the adopted edition and local amendments vary. The estimator follows the drawings and spec.
On the documents, GFCI breakers appear on panel schedules marked GFCI or GF, with the ampere rating and poles, and sometimes in the one-line or general notes that call for ground-fault protection on certain circuits. Plans may show GFCI receptacles by symbol instead. The takeoff unit is EA, sorted by rating and pole count, and each GFCI breaker is its own line, since it is a different product from a standard breaker. The breaker must also match the panel manufacturer and type.
Pitfalls include pricing GFCI breakers as ordinary breakers, double-counting where the plan shows a GFCI receptacle on a circuit that already has a GFCI breaker, and missing the construction-phase requirement. Under OSHA's rule, 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites not part of the permanent wiring need GFCI protection or an assured equipment grounding conductor program, which affects temporary power on the project.
Real Examples
Common Misconceptions
People assume: A GFCI breaker and a standard breaker are the same price line.
Actually: They are different products. A GFCI breaker has ground-fault protection built in, so it is counted and priced on its own line by rating and poles.
People assume: GFCI protection is only for receptacles.
Actually: CPSC guidance describes GFCI receptacles, GFCI circuit breakers and portable devices. Protection can sit at the panel for the whole circuit.
Does MeltPlan Solve This?
Partially — adjacentGFCI breakers and receptacles are counted from panel schedules and plan symbols, and MeltPlan's takeoff service covers that counting: AI pulls quantities from the plans, and US-based experienced estimators review and adjust them. Which locations need protection under the adopted code stays with the design team and your estimator.
Get breaker and device counts from your panel schedules →Frequently Asked Questions
What does a GFCI breaker do?
It works as a normal circuit breaker and also trips when it detects current leaking to ground. CPSC describes GFCIs as comparing outgoing and returning current and cutting power quickly when they differ.
What is the difference between a GFCI breaker and a GFCI outlet?
A breaker is installed in the panel and protects the full circuit. A GFCI receptacle sits in a box at the outlet and protects itself and anything wired downstream of it.
Where are GFCI breakers required?
Requirements come from the electrical code edition the jurisdiction has adopted. Bathrooms, kitchens, garages, exterior locations and areas near water are common examples, and local amendments vary. Check the drawings and spec.
How is a GFCI breaker counted in a takeoff?
It is counted EA from the panel schedule, sorted by ampere rating and number of poles, separate from standard breakers.