The LV846197 is a 4-pole MasterPact MTZ2 drawout circuit breaker from the MasterPacT range, rated 4000 A at 40 °C. This is a Category B breaker per EN/IEC 60947-2, designed for selective coordination downstream — it holds through a fault long enough for the branch breaker to clear first, keeping the main bus live. Mounting is drawout with a 115 mm connection pitch, supported on rails or a base plate. The control is push-button without a separate control unit, so the breaker trips and closes directly from the front fascia. IP30 enclosure keeps fingers out but is not washdown-rated; this breaker lives in a dry indoor cubicle.
Breaking capacity and coordination — the numbers that govern the fault study
Ics equals Icu here, so the breaker can be reclosed immediately after clearing a rated fault without derating. Icw holds 100 kA for 0.5 s and 75 kA for 3 s — this is the short-time withstand that makes selective coordination with downstream feeders possible. Icm making capacity is 220 kA at 415 V AC, meaning it closes against a fully developed fault without welding contacts. The 25 ms maximum breaking time at In means the arc is extinguished in under three cycles at 50 Hz. The closing response time is 70 ms maximum. For selectivity studies, these are the worst-case intervals to model.
Integration and mounting — what fits in the cubicle
Dimensions: 556 mm wide, 439 mm high, 403 mm deep. The drawout cradle requires a 115 mm pitch between phase connections. Mounting support is rails or a base plate; the breaker slides into the cradle and the racking mechanism engages the stab fingers. Front and rear connection options on both sides mean the cubicle bus bars can enter from above or below. Neutral is on the left; pole arrangement is fixed 4P. Rated insulation voltage is 1000 V AC, impulse withstand 12 kV. Altitude derating starts above 2000 m. Power dissipation at rated current is 900 W — factor that into the cubicle ventilation design.