The Schneider Electric MasterPact MTZ2 LV839073 is a 3-pole drawout air circuit breaker rated 2000 A at 104 °F (40 °C), built to ANSI C37.50. It carries an breaking capacity code, delivering up to 200 kA Icu at 254 VAC 60 Hz and 150 kA Icu at 508 VAC 60 Hz. The drawout chassis mounts on base plate rails with a 4.5 in (115 mm) connection pitch, sized for switchboard integration where the breaker must be racked out for maintenance without de-energizing the bus.
Breaking performance and protection
The breaking capacity code means this breaker handles 200 kA Icu at 254 VAC 60 Hz, 150 kA Icu at 508 VAC 60 Hz, and 100 kA Icu at 635 VAC 60 Hz per ANSI C37.50 — sufficient for high-fault utility feeds or large transformer secondaries. The integral instantaneous protection trips between 72 and 88 kA, covering bolted faults without relying on external relays. Maximum breaking time is 9 ms, and the rated short-time withstand current (Icw) is 30 kA for 0.5 s, allowing coordination with downstream breakers during delayed trips.
Physical footprint
Dimensions are 17.5 in wide × 17.3 in high × 16.8 in deep (444.3 × 438.8 × 426.8 mm). The drawout mechanism requires clearance in front for racking, and the base plate rails need a matching cutout in the switchboard floor. Connection pitch of 4.5 in (115 mm) aligns with standard bus bar spacing for 2000 A class breakers.