The LV839346 is the cradle for a MasterPact MTZ1 drawout breaker, rated 800 to 1600 A at 104 °F (40 °C), 3-pole. This is the stationary frame that the breaker unit slides into — not the breaker itself. The drawout mechanism lets you rack the breaker to connected/test/disconnected positions without unbolting power conductors, which matters for any panel where you need to isolate for maintenance or swap a unit without killing the bus.
Lifecycle status is active per Schneider's current product portfolio. For a BOM-critical spare like this cradle — it's the panel infrastructure the breaker lives in — active status means you can still spec it into new switchgear builds without worrying about a forced redesign mid-project.
Drawout mounting means the cradle bolts into the switchgear cubicle and accepts the MTZ1 breaker unit on telescoping rails. The 800-1600 A continuous current range covers the common frame sizes for 1600 A switchboards. Three-pole configuration for three-phase systems. The cradle carries the primary disconnect fingers, secondary control wiring connections, and the racking mechanism — all of which need to stay aligned with the breaker's stab assembly during insertion.
Part of the MasterPact MTZ1 family, which is Schneider's current-generation air circuit breaker platform for UL/ANSI and IEC installations. The cradle is a mounting accessory (Type Of Accessory: Mounting accessory), shipped as a single unit. UL/ANSI listing confirms it meets North American switchgear standards — critical for any panel that needs a third-party certification stamp.