The LV839153 is a Schneider Electric MasterPact MTZ2 drawout circuit breaker, UL 489 listed, rated 1600 A continuous at 104 °F (40 °C) across three poles. It's a protection device for large industrial feeders, switchboards, and main disconnects where high interrupting capacity and selective coordination are required. The L breaking capacity code means it delivers 200 kA Icu at 240 VAC, 150 kA Icu at 480 VAC, and 100 kA Icu at 600 VAC per UL 489 — enough to handle high-fault utility feeds without cascading upstream. The drawout cradle lets you rack the breaker out for safe maintenance or swap without disturbing line-side connections. Integral instantaneous protection is set at 72...88 kA, and the rated short-time withstand current (Icw) is 30 kA for 0.5 s per UL 489, which supports selective coordination downstream. Maximum breaking time is 9 ms — fast enough to limit let-through energy on a bus fault.
The LV839153 is a drawout breaker: it mounts into a fixed cradle with base plate rails (connection pitch 4.5 in / 115 mm). Overall dimensions are 17.5 in wide, 17.3 in high, 16.8 in deep. That depth includes the breaker body plus the drawout mechanism — account for the racking handle clearance in front of the panel. The cradle footprint is standard for MasterPact MTZ2 drawout; if you're retrofitting an older MT or NW cradle, verify the interface — the drawout alignment and secondary disconnect pinout changed on the MTZ2 generation.
Mechanical durability is rated 12,500 cycles per ANSI C37.50; electrical durability is 2,800 cycles under the same standard. For a main breaker that sees a few operations per day, that's decades of service. If your application requires frequent switching (e.g., capacitor bank or arc furnace duty), the mechanical endurance is the limit — the electrical endurance is lower because each interruption wears the contacts.