Square D LA molded case circuit breakers offer thermal magnetic protection with automatic opening during overload or short circuit conditions, which can be manually overridden using the Push-to-Trip feature. The 400A and 600VAC models come equipped with 3 poles, lugs, and have interrupting ratings of 22kA for 600VAC and 10kA for 250VDC, meeting standards such as UL 489, CSA, and IEC certification, while the MB suffix denotes a shorter handle to facilitate panel closure.