The Schneider Electric LV846206 is a MasterPact MTZ2 fixed-mount air circuit breaker, 4-pole, rated 3200 A at 40 °C. It's built for main switchboard and large distribution protection — the kind of gear that sits on a base plate or rails in a utility or industrial substation, not a panelboard. It's Category B selectivity per IEC 60947-2, so you can coordinate it downstream without sacrificing uptime on a fault.
The 100 kA Ics at 440 V AC is the service breaking capacity — the breaker clears that fault and is still usable afterward, not just a one-shot Icu. The Icw is 100 kA for 1 second, which gives you real headroom for short-time delay coordination with downstream feeders. That 75 kA for 3 seconds matters if your protection scheme needs a longer clearing window. Insulation voltage Ui is 1000 V AC, impulse withstand Uimp is 12 kV — this breaker is rated for the heavy end of low-voltage distribution.
Fixed-mount version — no draw-out cradle. The 537 mm width, 352 mm height, and 300 mm depth give you the envelope for a dedicated cell in a switchboard. Connection pitch is 115 mm, and both front and rear connections are available for the upside and downside. Neutral is on the right.
Durability and thermal budget
Mechanical durability is 15,000 cycles with periodic preventive maintenance — that's typical for a main breaker that sees infrequent switching. Electrical durability at rated current is 5,000 cycles at 440 V AC under AC-23A duty. Power dissipation is 420 W at full load, so factor that into your switchgear ventilation. Altitude derating above 2000 m is specified.