Siemens BF220A - 20 Amp Ground Fault Bolt-On Circuit Breaker

20 Amp, 2 Pole, 120/240VAC, 10kAIC, Bolt-On, Ground Fault with Self Test. UL Listed. Type BLF, Class A 2-Pole Ground-Fault Circuit-Interrupters are required in the following locations when 120/240 Volt AC circuits are used: Swimming/wading pools Fountains and decorative pools Therapeutic pools Hot tubs, spas, saunas, hydromassage bathtubs GFCIs now include new Self Test technology. GFCI testing is often overlooked, but essential. Siemens' GFCI now performs a self test every 15 minutes, adding an extra level of safety. If the auto monitor detects a problem with the GFCI protection, the breaker will trip or provide visual indicators.