Siemens 15-amp 1-Pole GFCI Circuit Breaker Model #QF115AP Ground fault circuit interrupters (GFCIs) are an effective means of preventing severe electrical shock or electrocution from ground faults. To protect equipment from damaging ground faults, Siemens GFCIs monitor the difference in current between the hot and neutral conductors. If the electricity going to an outlet equals the current coming back from the outlet, the GFCI is dormant. If the electricity going to an outlet is greater than 5mA than the current coming back from the outlet, the GFCI will open the circuit to stop of flow of electricity. With the extension of the National Electrical Code 2020 to protect more areas of the home, Siemens has expanded the GFCI product line to include 25, 35, and 45A ratings, continuing to provide complete home safety for our customers. The NEC 2020 Article 210.8(F) extends GFCI protection to circuits feeding HVAC units and other modern-life applications. Device intended for personnel protection from Ground Faults LED trip indicators to help identify fault conditions Autonomously and continuously tests itself for device malfunction Suitable for a variety of construction applications including spas, hot tubs, kitchens, bathrooms, etc Self-test and lockout feature enables the GFCI circuit breaker to automatically and continuously test itself to ensure that it is working properly as required by UL 943 Resists false tripping (shielded to prevent RF interference) Class A (5 mA) ground fault protection White line neutral (pigtail) must be connected to the panel neutral for the device to function #14 - #8 AWG copper, #12 - #8 AWG aluminum wire range