What Is an Arc-Fault Circuit Interrupter?
An Arc-Fault Circuit Interrupter is a protective electrical device that detects unsafe arcing in a circuit and disconnects power. Arcing can occur when electricity jumps across a damaged, loose, or deteriorated connection. The device helps reduce fire risk from hidden wiring faults that a standard circuit breaker may not detect.
Quick Facts About Arc-Fault Circuit Interrupter
Category
Circuit protection device
Used for
Detecting hazardous electrical arcing
Common confusion
Different from ground-fault protection
Also called
AFCI, Arc-Fault Interrupter
Often discussed with
Electrical Code Correction
Key Takeaways About Arc-Fault Circuit Interrupter
- It responds to arc patterns that standard breakers may miss.
- It protects branch circuits from certain wiring-related fire hazards.
- An AFCI is not the same device as a ground-fault interrupter.
How Arc-Fault Circuit Interrupter Works
An Arc-Fault Circuit Interrupter monitors the electrical current flowing through a branch circuit. Its sensing electronics look for patterns that suggest an unintended arc, such as repeated electrical discharge across a damaged connection. When the device identifies a dangerous pattern, the interrupter opens the circuit and stops the current.
Related glossary terms: Arc Flash, Ground Fault Protection.
An AFCI may be installed as a circuit breaker or as a receptacle, depending on the wiring arrangement and protection plan. The device protects against arc faults caused by conditions such as damaged insulation, loose terminals, or crushed cords. Ground-fault protection serves a different purpose by responding to current flowing along an unintended path to ground.
From the GMB Electric team
When we check an Arc-Fault Circuit Interrupter, we inspect its installation, circuit connections, labeling, and test function. We also look for wiring damage or loose terminations that could cause nuisance trips or indicate a deeper fault. Our team documents code-related corrections as part of the electrical inspection.
Arc-Fault Circuit Interrupter in Practice: A Real-World Example
A homeowner reports that a bedroom circuit trips after a receptacle is moved. We inspect the Arc-Fault Circuit Interrupter, the receptacle wiring, and nearby cable for damaged insulation or loose connections before correcting the circuit.
Related Services
Related Terms
Arc Flash
Arc flash is a sudden electrical explosion that occurs when current leaves its intended path and…
Ground Fault Protection
Ground Fault Protection is a protective function that detects when electrical current leaves its intended path…
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