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What exactly is a combination arc fault circuit interrupter or CAFI breaker?

Issue:
What is a CAFI breaker?

Product Line:
Circuit Breakers

Environment:
Applies to QO and HOM type AFCI breakers

Resolution:
  • QO and HOM arc-fault circuit breakers with suffix AFI protect against parallel arcs. These originally had a blue test button, but that was then changed to green.
  • QO and HOM arc-fault circuit breakers with suffix CAFI protect against both parallel and series arcs. Because they combine the protection against both types of arcs, they are called Combination Arc-Fault Breakers. They have a white test button.
To read about the difference in parallel and series arcs, see FA94231.
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