The Schneider Electric LV839060 is a Masterpact MTZ3 50 HF automatic switch disconnector, rated 5000 A at 104 °F (40 °C) in a 3-pole fixed configuration. It's built for distribution duty on AC networks at 50/60 Hz, with push-button control and a fixed mounting mode that bolts directly into the switchgear lineup — no DIN-rail play here, this thing lands on a panel floor or chassis. The headline number that matters for selectivity coordination is the breaking capacity: 100 kA Icu at 254 V AC and 508 V AC, and 85 kA Icu at 635 V AC, all with an external relay per ANSI C37.50. Short-time withstand current is rated at 85 kA for 1.5 seconds per ANSI C37.50, which tells you it can ride through a delayed trip coordination scheme without damage. That's the spec you check when you're cascading breakers downstream and need the main to hold for a couple of cycles while the branch clears.
At 30.2 in (767 mm) wide, 13.9 in (352.2 mm) tall, and 11.7 in (297.1 mm) deep, this is a large-frame switch that needs a dedicated cutout or mounting plate. The connection pitch of 9.06 in (230 mm) sets the bus-bar or cable landing spacing — verify your existing bus centers before committing the BOM line.