The QJ frame circuit breaker family is designed for protection of branch and feeder circuits in either industrial or commercial applications 70A to 225A at 240VAC. Due to the high continuous ampere ratings, interrupting ratings, and compact size, QJ frame circuit breakers are suited for use as mains in load centers, lighting panel boards, and metering centers. They are also ideal for installation in distribution panel boards, control panels, motor control centers, and individual enclosures. Siemens strongly recommends against the use of "used" breakers. The installation of used breakers in a Siemens panel will void the warranty on the panel. Siemens does not sell used breakers and has not approved any 3rd party sellers to do so.