Used and tested in great shape Ships Fast and Safe! The Square D QO320 is a 3 Pole 20 Amp Type QO Plug-In Circuit Breaker designed for industrial and commercial electrical systems. Manufactured in the United States by Square D, a trusted brand in the industry, this circuit breaker features a plug-in mounting style for easy installation and maintenance. With a maximum amperage of 20A and compatibility with AC current type, this black-colored breaker is reliable and efficient for ensuring the safety and functionality of electrical circuits.