Siemens SENTRON 3VA1220-6MH32-0JC0 — 200 A MCCB with shunt trip
The Siemens SENTRON 3VA1220-6MH32-0JC0 is a 3-pole molded case circuit breaker rated at 200 A continuous, with a design optimized for starter protection. It carries a 220 kA interrupting rating at 240 V AC, stepping down to 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V — so the available fault current at the panel dictates which voltage column governs your coordination study. The unit includes a factory-installed shunt trip (STL) and two HQ auxiliary switches, saving a panel-build step versus field-fitting them later.
Thermal derating and power loss
Rated 200 A continuous at 40 °C through 50 °C ambient; above that the breaker derates linearly to 176 A at 70 °C. If your panel ambient runs near the upper end, size the upstream conductor for the derated value, not the nameplate 200 A. Maximum power loss is 42 W per pole — enough heat to factor into enclosure ventilation if you are stacking multiple breakers in a sealed cabinet.
Dimensions and panel fit
Footprint is 105 mm wide by 158 mm tall by 70 mm deep — a standard 3-pole MCCB form factor that fits most DIN-rail or panel-mount enclosures without re-drilling. The depth leaves clearance for rear-connected bus bars or a cable entry gland plate.