Two state-of-the-art technologies combined in one device. Introducing the Dual Function Circuit Breaker that provides Arc Fault and Ground Fault protection in one device.A device that tests itself. Testing GFCIs and AFCIs on a monthly basis is a good idea that is sometimes forgotten. Now the new Self Test & 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, the device trips itself and locks out the homeowner from resetting the device, reducing the possibility of the homeowner incorrectly assuming that the device was tripped to prevent a ground/arc fault. This effortless system guarantees that only the best protection is given to your home at all times.