20 amp single pole 120 volt. the dual function circuit breaker combines gfci and afci, protecting against both arc faults and ground faults with the new self-test and lockout feature. the 2014 national electrical code (nec) now requires both arc fault and ground fault protection on kitchen and laundry circuits. the dual function circuit breaker combines these 2 devices into once solution that provides both cost savings and less hassle in installation and maintenance. now the new self-test and lockout feature enables the dual function circuit breaker to automatically and continuously test itself to ensure that it is working properly. if it is detected that the device has been compromised, it trips itself and locks out the homeowner from resetting the device.