Square D LH molded case circuit breakers offer automatic protection against overload or short circuits by opening the circuit, with manual options also available through the Push-to-Trip feature. The breaker features thermal and magnetic sensing elements in each pole, providing reliable protection for up to 600VAC and 250VDC circuits, with interrupting ratings of 25kA and 50kA respectively, meeting standards such as UL 489, CSA, and IEC certifications.