SENTRON 3VA1220-6GF42-0KF0 — 200 A MCCB for Line Protection
The Siemens SENTRON 3VA1220-6GF42-0KF0 is a 4-pole molded case circuit breaker rated at 200 A continuous, designed for line protection in distribution panels. Its breaking capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 75.6 kA at 440 V — figures that govern fault-clearing capability at the point of common coupling. The breaker carries a shunt trip release (STL) and one auxiliary switch plus one trip alarm switch (HQ), so it integrates into remote-trip or status-monitoring circuits without an external interposing relay. Rated insulation voltage is 800 V, and the unit dissipates 42 W maximum at rated load — a figure that factors into enclosure thermal calculations when grouping multiple breakers.
Thermal Derating and Ambient Constraints
The breaker holds 200 A continuously from 40 °C through 50 °C ambient. At 55 °C it derates to 194 A, at 60 °C to 188 A, at 65 °C to 182 A, and at 70 °C to 176 A. The operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. For a panel designer: if the breaker sits in a 55 °C enclosure with other heat sources, the usable load current drops to 194 A — the full 200 A rating applies only up to 50 °C.
Lifecycle and Sourcing
This is a standard catalog item in the SENTRON 3VA platform. For BOM-line commitment, the part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Panel Fit and Dimensions
The MCCB measures 70 mm deep, 140 mm wide, and 158 mm high. It mounts on a DIN rail or panel-mount adapter in the standard SENTRON footprint. The 4-pole width (140 mm) matches the 4-pole slot in a Siemens distribution board; verify gland-plate clearance for the 70 mm depth before laying out the backplane.