The Schneider Electric LV839056 is a Masterpact MTZ3 40 HF switch disconnector rated for 4000 A at 104 °F (40 °C), 3-pole, fixed-mount, designed for distribution applications per ANSI C37.50. The part carries a breaking capacity of 100 kA Icu at 254 V AC 50/60 Hz with an external relay, and 85 kA Icu at 635 V AC — meaning it can safely interrupt fault currents up to those levels without upstream cascading, critical for selectivity studies in large switchboards.
The 4000 A rated operational current (Ie) at 40 °C sets the continuous load capacity — sized for high-current feeders or main incomers in industrial or utility distribution. The short-time withstand current (Icw) of 85 kA for 1.5 s per ANSI C37.50 defines the thermal and dynamic stress the switch can handle during a delayed fault clearing; this is the figure coordination engineers use to verify the switch survives downstream breaker clearing time. Dimensions are 30.2 in (767 mm) wide, 13.9 in (352.2 mm) tall, and 11.7 in (297.1 mm) deep — these govern the panel cutout and mounting footprint for fixed-mount installations.