MA3300 3 Pole 600V 300 AMP Molded Case Circuit Breaker, is now obsolete. This is a factory frame includes 3 lugs and thermal unit/Trip unit. AB-Deion LA Circuit Breakers by Westinghouse now owned by Eaton Cutler-Hammer Corp. Shunt trips and Auxiliary are available for field installation, however an experienced tech is required. Specify Trip unit desired and specific lug requirements.