Square D LA molded case circuit breakers offer thermal magnetic protection, automatically opening a circuit under overload or short circuit conditions or manually tripped using Push-to-Trip. They have thermal and magnetic sensing elements in each pole, are mountable breaker units, rated for 400A and 600VAC with lugs, and come in various configurations such as the 1021 suffix indicating factory installed shunt trips, certified by UL 489, CSA, and IEC standards.