The LV848104 is a fixed-mount MasterPact MTZ3 50 H2 air circuit breaker in a 4-pole configuration. Its 5000 A rated current at 40 °C sets the continuous ampacity for the main feeder — size the upstream transformer and busway for that full-load current, not less. The H2 performance class delivers 150 kA Ics at 415 V AC, meaning after clearing a fault at that level the breaker is rated to switch the load back on without inspection or part replacement. That is the difference between a one-hour outage and a shift-long repair. Category B selectivity means the breaker coordinates with downstream devices so only the faulted branch opens — the main stays closed and the rest of the plant keeps running. The 100 kA Icw for 3 seconds tells you it can pass fault current while the downstream breaker clears, which is the core requirement for a fully selective distribution scheme.
This is a fixed-mount breaker — no draw-out cradle. It bolts to a base plate or rails inside the switchgear lineup. Both upside and downside connections are rear, so cable or busbar entry and exit happen behind the panel. The 230 mm connection pitch sets the busbar drilling pattern. Neutral sits on the right. Overall dimensions: 997 mm wide, 352 mm high, 300 mm deep. That depth is the chassis only — allow additional clearance for rear connections and cable bending radius when sizing the enclosure. This is standard for indoor switchgear. If the installation sees washdown or outdoor exposure, it needs a higher-rated enclosure around it.
For a BOM-critical 5000 A feeder, this is the part to lock in.
Electrical durability: 6000 cycles in AC-3 duty at 440/690 V. Mechanical durability: 10,000 cycles with periodic preventive maintenance. Maximum breaking time is 25 ms; maximum closing response time is 80 ms. Power dissipation at rated current is 420 W — factor that into the switchroom HVAC load.