The LV846186 is a MasterPact MTZ2 fixed-mount circuit breaker rated 3200 A at 40 °C with an H2V performance class delivering 100 kA breaking capacity at 415 V AC. The 4-pole configuration with neutral on the left is standard for 3-phase + N distribution. Category B selectivity means it's designed for full discrimination with downstream breakers, so a fault on a branch won't take the main bus down — that's the difference between a nuisance plant blackout and a localized trip. Short-time withstand Icw is 100 kA for 1 second, giving you real coordination headroom for downstream devices with longer trip delays. Rated impulse withstand voltage Uimp is 12 kV, covering typical surge environments in industrial switchgear.
Fixed-mount design — this is a bolted-in switchgear breaker, not a draw-out cassette. It mounts on rails or a base plate inside a distribution cabinet. Dimensions: 537 mm wide, 352 mm high, 300 mm deep. That 300 mm depth is the dimension you need for enclosure depth planning — make sure the gland plate and busbar clearance behind the breaker can accommodate it. Connection pitch is 115 mm, which matters for busbar drilling patterns. Upside and downside connections both accept front or rear termination, giving flexibility for cable or busbar entry in the cabinet layout.
Also listed to IEC 61557-12 for measuring equipment in LV systems. Electrical durability is rated at 5000 cycles at In under AC-23A conditions; mechanical durability is 15,000 cycles with periodic preventive maintenance. Power dissipation is 420 W at rated current — factor that into enclosure ventilation calculations.