Abstract: An improved circuit breaker for electric panelboards is configured to facilitate replacement of an existing circuit breaker when its buss bar mount is damaged due to circuit overload or other fault conditions. The improved circuit breaker has an extension section that extends the breaker housing to a buss bar connector on a distally positioned buss bar and an electrical connector in the extension section that engages the distal bar connector thereon. The improved circuit breaker is provided with a cavity on the bottom side thereof that is sized and configured to substantially straddle the damaged buss bar connector on the proximally positioned buss bar, to which the replaced circuit breaker was originally connected. In an alternative embodiment, preferably configured for twin or quad circuit breakers, a second electrical connector is provided in the cavity to engage a non-damaged proximal bar connector to better divide the electrical draw between buss bars.