The Schneider Electric LV839003 is a Masterpact MTZ3 50 HA non-automatic switch disconnector — a 4-pole, fixed-mount device rated for 5000 A continuous at 40 °C ambient. That 5000 A figure is the current it can carry without exceeding temperature rise limits in a distribution panel; it is not a switching rating for frequent motor starts. The 65 kA Icu breaking capacity at 254 V, 508 V, and 635 V AC (with external relay, per ANSI C37.50) tells you the maximum fault current it can safely interrupt once — above that, the device may be damaged and needs replacement. The short-time withstand rating of 85 kA for 0.5 s means it can ride through a delayed fault coordination window without failing, which is critical for selective coordination in a switchboard.
Deployment context
This is a fixed-mount switch disconnector for distribution — it goes into a switchboard or panel as a main disconnect or large feeder breaker. The 996.3 mm width and 297.7 mm depth mean it needs a substantial cutout and rear access for the power connections at 230 mm pitch. It is not a DIN-rail device; plan for bolted busbar connections and a lifting fixture during installation.