The LV839027 is a Schneider Electric MasterPact MTZ3 drawout circuit breaker, 3-pole, rated 4000 A at 40 °C, with H3 breaking capacity delivering 100 kA Icu at 508 V AC per ANSI C37.50. It ships without a Micrologic trip unit — the buyer sources the protection relay separately to match the coordination study. The drawout cradle allows the breaker to be racked out for maintenance without disturbing the bus connections, standard for large ANSI switchgear.
The H3 frame gives 100 kA Icu at 254 V AC, 100 kA Icu at 508 V AC, and 85 kA Icu at 635 V AC. The rated short-time withstand current (Icw) is 85 kA for 0.5 s, which supports delayed tripping for zone-selective interlocking — critical for coordinating downstream feeders without sacrificing arc-flash energy. The integral instantaneous protection range is 171–209 kA, and the rated breaking and making capacity is 170 kA. Maximum breaking time is 25–30 ms; maximum closing response time is 70 ms.
Physical integration
The drawout chassis mounts on base plate rails. 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). The breaker is designed for ANSI switchgear lineups — verify the cradle cutout and bus spacing against the existing gear before ordering.