20A, 120V, Single Pole, Dual Function Circuit Breaker, Combines GFCI & AFCI, Protecting Against Arc Faults & Ground Faults With The Self Test & Lock Out Feature, Enables The Dual Function Circuit Breaker To Automatically & Continuously Test Itself To Ensure That It Is Working Properly, If It Is Detected That The Device Has Been Compromised, It Trips Itself & Locks Out The Homeowner From Resetting The Device, 2014 National Electrical Code Requires Both Arc Fault & Ground Fault Protection On Kitchen & Laundry Circuits.