What this MCCB does for a motor branch
The Siemens SENTRON 3VA1220-6MH32-0DA0 is a 3-pole molded case circuit breaker rated 200 A continuous, built specifically for starter protection — meaning it's designed to sit ahead of a motor contactor and overload relay, not as a standalone feeder breaker. The 200 A frame carries a TM120M thermal-magnetic trip unit that handles motor inrush without nuisance tripping, while the interrupting ratings tell you where it can clear a fault: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V. That 154 kA at 415 V is the number most panel builders will check first for a 400 V motor control center. The breaker includes an integrated undervoltage release (UVR), so if control power drops, the MCCB trips — useful for coordinated safety shutdowns on conveyors or kiln drives where loss of control voltage should kill the main power. No communication function, no ground-fault monitoring; this is a straightforward thermal-magnetic MCCB with the UVR as the only auxiliary release.
Thermal derating — what 200 A means at 70 °C
The 200 A rating holds at 40, 45, and 50 °C ambient. At 55 °C it's 194 A, at 60 °C it's 188 A, at 65 °C it's 182 A, and at 70 °C it's 176 A. If this MCCB lives in a hot control room — say near a kiln or furnace line — you size the load to the derated value, not the nameplate. The operating range is -25 to 70 °C, storage from -40 to 80 °C, so it survives the transport and the environment.
Panel fit and power loss
Dimensions are 70 mm deep, 105 mm wide, 158 mm tall — a compact 3-pole MCCB that fits standard Siemens SENTRON mounting and busbar systems. Maximum power loss is 44.5 W, so factor that into enclosure thermal calculations, especially if the panel is sealed against cement dust or washdown. The design is starter protection, meaning the trip curve is shaped for motor starting duty rather than feeder protection.