The Schneider Electric LV838923 is a MasterPact MTZ2 drawout circuit breaker, 3-pole, rated 2000 A at 40 °C, with an LF breaking capacity code. The integral instantaneous protection trips between 49.5 and 55.5 kA — that's the magnetic-only pickup range for bolted faults. Below that, the 22 kA short-time withstand (Icw) for 0.5 s per UL 489 lets the breaker ride through downstream faults long enough for a feeder breaker to clear, preserving selectivity. Drawout mounting means the breaker chassis stays bolted to the base plate rails, and the removable cradle slides in and out for safe maintenance or swap without disturbing the bus connections. The 4.5 in (115 mm) connection pitch matches standard panel bus spacing for this frame size.
Sourcing reality — lifecycle and procurement posture
This part is officially obsolete per the manufacturer. If your design is still in the specification phase, this is the moment to evaluate a current-production MasterPact MTZ frame with a similar rating to avoid a future last-time-buy scramble.
The breaker occupies a 17.5 in wide by 17.3 in tall by 16.8 in deep footprint. That depth includes the drawout mechanism and arc chute — verify your enclosure depth allows the full 426.8 mm for the cradle plus clearance for the rear bus connections and any auxiliary wiring trough. The base plate rails are the intended mounting support; no additional sub-panels needed for this frame.