The Schneider Electric LV839035 is a MasterPact MTZ3 drawout circuit breaker rated for 6000 A continuous at 104 °F (40 °C), 3-pole, with H3 breaking capacity. It carries 100 kA Icu at 254 V and 508 V AC, and 85 kA Icu at 635 V AC per ANSI C37.50 — meaning it can safely interrupt fault currents up to those levels without cascading upstream. The breaker ships without a Micrologic trip unit, so the buyer selects and installs the protection relay separately, matching the trip curve to the downstream load.
Breaking performance and coordination
The H3 breaking capacity code delivers 170 kA rated breaking and making capacity and an integral instantaneous protection range of 171–209 kA. Short-time withstand current (Icw) is 85 kA for 0.5 s per ANSI C37.50, which governs how long the breaker can carry a fault while downstream devices clear — critical for selective coordination in a distribution panel. Maximum breaking time is 25–30 ms; closing response is 70 ms.
Physical integration and mounting
Drawout mount on base plate rails — the breaker slides into a fixed cradle, allowing removal without disconnecting power cables. Overall dimensions: width 31.07 in (789.1 mm), height 18.8 in (478.1 mm), depth 16.8 in (426.8 mm). Connection pitch is 9.06 in (230 mm). Panel builders should verify the cradle cutout and bus bar spacing against these dimensions before committing the switchgear layout.
Mechanical durability is 12,500 cycles per ANSI C37.50; electrical durability is 2,800 cycles — the electrical figure is the limiting factor for applications with frequent switching, such as capacitor bank or motor feeder duty.