LSI stands for Long-time, Short-time, and Instantaneous protection — the electronic trip gives you adjustable time-current curves, which matters when coordinating downstream feeders or motor starters in a panel. The 3-pole configuration suits three-phase loads; the fixed thermal-magnetic element means the thermal and magnetic pickup settings are factory-set, not field-adjustable. UL/CSA listing confirms the breaker meets North American code requirements for branch-circuit protection.
Deployment context
This MCCB mounts in a standard panel or enclosure — no DIN-rail adapter, it bolts directly to the backplane. The XT4 frame size fits alongside other XT series breakers in a common distribution board, sharing busbars and accessories like shunt trips or auxiliary contacts.