The Square D QO120GFI is a 20A single pole ground fault circuit breaker with overload protection, ideal for residential and commercial electrical systems. Manufactured by Square D (Schneider Electric), this circuit breaker has a maximum amperage of 20A and operates at 120VAC. The model QO120GFI is reliable and efficient in protecting electrical circuits from potential faults while providing a quick means of disconnecting in the event of a fault.