The LV839079 is a Schneider Electric MasterPact MTZ3 3-pole drawout circuit breaker rated for 5000 A continuous at 104 °F (40 °C), with an breaking capacity code. It's built for ANSI C37.50 applications up to 635 VAC, and it ships without a Micrologic trip unit — you'll need to order that separately based on your protection coordination scheme.
This breaker carries a 200 kA Icu at 254 VAC 60 Hz and 150 kA Icu at 508 VAC 60 Hz per ANSI C37.50. At 635 VAC 60 Hz it still holds 130 kA Icu. The integral instantaneous protection trips between 243 and 297 kA, so it clears hard faults before they cascade upstream. Rated short-time withstand current (Icw) is 100 kA for 0.5 s per ANSI C37.50, which means it can ride through a delayed trip coordination window — essential for selective coordination with downstream feeders. The maximum breaking time is 9 ms, and closing response time is 70 ms. Rated breaking and making capacity is 90 kA, and the CT rating matches the line current at 5000 A. Mechanical durability is 10,000 cycles, electrical durability 1,000 cycles per ANSI C37.50 — that's typical for a drawout power breaker; it's not a daily-operating contactor, it's a protective device for the main distribution.
Physical footprint and mounting
The drawout chassis measures 17.5 in wide by 17.3 in tall by 16.8 in deep (444.3 x 438.8 x 426.8 mm). Connection pitch is 9.06 in (230 mm). It mounts on a base plate with rails — standard for metal-enclosed switchgear lineups. The drawout design means you can rack the breaker out for maintenance or replacement without disturbing the bus connections.