The Schneider Electric LV839090 is a Masterpact MTZ3 40 HC switch disconnector rated 4000 A at 104 °F (40 °C), 3-pole, fixed-mounted, intended for distribution applications. At 508 V AC the same configuration delivers 200 kA Icu, and at 635 V AC it holds 130 kA Icu, so the part handles the full low-voltage range common in North American industrial plants.
The 4000 A rated operational current (Ie) governs the continuous load it can carry — sized for a main feeder or large bus riser in a 480 V distribution switchboard. The 100 kA short-time withstand current (Icw) for 1.5 s per ANSI C37.50 tells you the breaker can pass that fault current without damage while downstream devices clear, supporting selective coordination schemes. Fixed mounting and push-button control suit it for drawout-free installations where the breaker stays bolted in place and is operated locally.
At 30.2 in (767 mm) wide, 13.9 in (352.2 mm) high, and 11.7 in (297.7 mm) deep, the LV839090 occupies a substantial footprint — plan for a dedicated compartment in the switchgear lineup. The 9.06 in (230 mm) connection pitch sets the bus-bar or cable landing spacing. Fixed mounting means the breaker does not require a drawout cradle, saving some enclosure depth but requiring direct wiring access.