The Schneider Electric LV839036 is a MasterPact MTZ3 ANSI power circuit breaker rated for 6000 A continuous at 40 °C, 4-pole, fixed-mount, with an H3 breaking capacity class. The H3 rating delivers 100 kA Icu at 508 V AC and 85 kA Icu at 635 V AC per ANSI C37.50 — that is the maximum fault current it can safely interrupt without damage, so it is sized for high-fault-capacity main service entrances or large feeder positions where upstream fault current can exceed 85 kA. The short-time withstand rating of 85 kA for 0.5 s (Icw) means it can carry that fault current for half a second while a downstream device clears, which is the coordination window a selective system needs. The unit ships without a Micrologic trip unit — the buyer selects and installs the appropriate electronic trip module separately, matching the protection curve (LSIG, LS, or others) to the load. This is standard for the MTZ platform: the breaker frame and the trip system are ordered as separate line items.
Deployment context
Fixed-mount base plate with rails — the breaker bolts into a switchgear lineup or a dedicated enclosure. At 39.2 in wide by 13.9 in tall by 11.7 in deep, it occupies a standard vertical section in an ANSI metal-enclosed low-voltage switchgear assembly.