The Square D QO220 Circuit Breaker is a 20A, single-throw, air circuit breaker suitable for both interior and exterior walls. It features Type D tripping characteristics, thermal overload protection, and a trip indicator. With a maximum amperage of 20A and operating temperature of 40°C, this circuit breaker is designed for any room and offers overload and open circuit protection. The black plastic construction with a plug-in mounting style makes it easy to install and operate, providing instantaneous break time for reliable electrical connections. Made by Square D, a trusted brand in electrical equipment, this circuit breaker is a reliable and efficient solution for your electrical needs.