The Schneider Electric LV839061 is a Masterpact MTZ3 50 HF automatic switch disconnector rated for 5000 A at 104 °F (40 °C) — that is the continuous current it carries without derating in a standard 40 °C ambient. Breaking capacity hits 100 kA Icu at 508 V AC 50/60 Hz with an external relay per ANSI C37.50, and 85 kA Icu at 635 V AC. Rated short-time withstand current [Icw] is 85 kA for 1.5 s per ANSI C37.50, so it holds through delayed-tripping coordination windows without the contacts welding shut.
Lifecycle and sourcing — active, available to order
This is not a phase-out or NRND part — it is current-catalog, so you can spec it into a new switchboard lineup without worrying about a last-time-buy window closing.
Integration — what fits around it
Chassis-mount, drawout, 3-pole. The connection pitch is 9.06 in (230 mm) between phases — verify bus-bar drilling matches before the switchboard steel is punched. Overall footprint: 31.07 in wide × 18.8 in high × 16.8 in deep (789.1 × 478.1 × 426.8 mm). That depth includes the drawout cradle; account for rear cable egress and the external relay mounting space. Push-button control on the front fascia for local open/close; AC control voltage network type.