The LV839006 is a Masterpact MTZ3 60 HA non-automatic switch disconnector — a drawout, three-pole device rated for 6000 A at 104 °F (40 °C) on AC distribution. It's built to ANSI C37.50 standards, so the interrupting ratings are certified at specific voltages: 65 kA Icu at 254 V, 508 V, and 635 V AC, all with an external relay. That means this breaker can handle fault currents up to 65 kA across the common low-voltage distribution voltages you'd see on a 480 V or 600 V plant bus. The short-time withstand rating is 85 kA for 0.5 s per ANSI C37.50, which gives you the selectivity headroom for coordinated protection schemes downstream. You're not just looking at a big number — that Icw tells you the switch can ride through a delayed trip without welding contacts, as long as the fault clears within half a second.
Mounting and service access
Drawout mounting means the switch mechanism slides out of its chassis without disconnecting the main power cables. On a 6000 A feeder, that's the difference between a two-hour swap and a two-day bus shutdown. The chassis mount is the fixed part; the drawout cradle carries the interrupting chamber and control wiring. Panel cutout dimensions are 16.8 in deep by 31.07 in wide by 18.8 in tall — verify your enclosure backplate has that clear space before the crane arrives. Connection pitch is 9.06 in (230 mm) between phase centers, which matches standard busbar spacing for this class of switchgear. The control type is push-button, so the operator interface is local to the unit — no separate control power supply needed for the basic open/close function on AC network.