The LV839308 is a MasterPact MTZ3 drawout circuit breaker rated 5000 A continuous at 40 °C — that's the full-frame current, not a derated number, so it handles a 5000 A bus without forced cooling. The H2 breaking capacity code delivers 85 kA Icu at 508 VAC (per ANSI C37.50), which covers most industrial secondary-distribution fault levels in North America. The 170 kA rated breaking and making capacity tells you it can close into and interrupt a bolted fault at that level, critical for coordination studies. The 85 kA short-time withstand (Icw) for 0.5 s means it holds through delayed trips downstream — selectivity headroom for a multi-level distribution scheme.
Deployment context
Drawout mounting on base plate rails means the breaker slides into a fixed cradle — no bolted bus connections to torque. That cuts swap time during maintenance or fault replacement to minutes, not hours. The 3-pole configuration suits 3-phase AC distribution in switchgear lineups. The 50/60 Hz network frequency covers both 60 Hz North American and 50 Hz global installations without a de-rate.