Siemens GFCI circuit breakers are UL Listed and cUL Certified to provide Class A GFCI protection. Current imbalances of 4-6 mA or more between load conductors will cause the ground fault sensor to trip the circuit breaker. These circuit breakers offer Self-Test and Lockout features as required by UL 943, enabling the GFCI 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 signaling to the homwoener it must be replaced to help guarentee the best protection. 10,000 AIR rated breaker and designed for use with 120/240-Volt AC systems. Device intended for personnel protection from Ground Fault LED trip indicators to help identify fault conditions Ideal for wet and damp locations such as pools, spas, HVAC, kitchen and bathroom circuits Reduced size breaker allows for more wire bending space Type QPFB circuit breaker, replaces Siemens model QF220AP and QF220A Resists false tripping (shielded to prevent RF interference) 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 UL and cUL Listed; HACR and SWD rated Series Name: QPFB Type: GFCI Power Capacity: 20-amp Width Measurement: 2-in Circuit Breaker Voltage: 120/240 Ground Fault Protection: Self test Interrupting Amp Listing (Amps): 10000 Number of Poles: 2 Phase: Single phase (120/240) Plug-On Neutral: No Surge Protection: No Warranty: 1-year CA Residents: Prop 65 Warning(s): No Safety Listing: UL safety listing UNSPSC: 39121600