What you're looking at
This is a Schneider Electric MasterPact MTZ2 drawout circuit breaker, order code LV839196, rated 2000 A continuous at 40 °C on a 3-pole frame. It carries an breaking capacity code — meaning 200 kA Icu at 254 V AC 60 Hz per ANSI C37.50, 150 kA at 508 V AC, and 100 kA at 635 V AC. The 2000 A CT rating matches the line current, so it's a straight-rated frame, not a reduced-size sensor. The drawout cradle lets you rack the breaker in and out without unbolting power cables — standard for switchgear where you need isolation for maintenance or a quick swap. The ArcBlok technology inside contains and directs the arc upward, reducing arc-flash energy at the front of the gear.
Lifecycle reality — obsolete, not orphaned
The mechanical and electrical durability figures (10,000 mechanical cycles, 1,000 electrical cycles per ANSI C37.50) give you a baseline for the used gear you might find on the secondary market.
In a 480 V system (508 V nominal per ANSI), that drops to 150 kA Icu, still well above most utility-transformer fault levels. The 30 kA short-time withstand (Icw) for 0.5 s tells you it can ride through a delayed trip coordination scheme — useful when you're selectively coordinating with downstream feeders. Integral instantaneous protection trips between 72 and 88 kA — that's the magnetic-only trip for bolted faults. The maximum breaking time of 9 ms and closing response of 70 ms are the mechanical limits of the operating mechanism; the actual arc-extinction time is faster thanks to the ArcBlok chamber.
Physical footprint and mounting
The drawout breaker measures 17.5 in wide by 17.3 in tall by 16.8 in deep. The connection pitch is 4.5 in between pole centers, and it mounts on a base plate with rails — standard for ANSI switchgear cubicles. If you're retrofitting into an existing lineup, verify the cradle cutout matches; the drawout mechanism requires the full depth for racking clearance.