The LV839310 is a Masterpact MTZ3 50 HA switch disconnector rated for 5000 A at 104 °F (40 °C), with a 65 kA Icu breaking capacity across 254 V, 508 V, and 635 V AC 50/60 Hz per ANSI C37.50. The 65 kA Icw short-time withstand (0.5 s) lets it ride through a delayed trip without damage, so you can coordinate with downstream feeders. The drawout chassis mounting means the breaker can be racked out for maintenance or replacement without de-energizing the bus — a standard requirement for main and tie breakers in switchgear.
The drawout mounting and chassis support place this breaker in a metal-enclosed low-voltage switchgear lineup — ANSI-rated, typically for main, tie, or large feeder positions. The 3-pole configuration with push-button control suits distribution applications where remote or local switching is needed. ArcBlok technology is integral to the arc chamber design, reducing arc energy during interruption and extending contact life.