The Siemens SENTRON 3VA1220-6MH32-0DD0 is a 3-pole molded case circuit breaker rated at 200 A continuous, with a breaking capacity of 220 kA at 240 V AC. It is designed for starter protection — meaning it integrates overload and short-circuit protection for motor branch circuits in a single frame, with an undervoltage release (UVR) built in. The 200 A rating holds flat from 40 °C through 50 °C, then derates linearly to 176 A at 70 °C, which is the maximum operating ambient temperature. Per the datasheet, the rated insulation voltage is 800 V, and the maximum power loss is 44.5 W.
Breaking capacity across the voltage range
The interrupting rating drops steeply as system voltage rises: 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. For a 480 V panel, the 75.6 kA figure still provides substantial fault-current headroom for most industrial service-entrance or feeder applications. At 690 V the 4.5 kA limit means this breaker is not suitable for high-fault 690 V motor circuits without upstream current-limiting fuses or a higher-rated frame.
Thermal derating and enclosure fit
The 3VA1220-6MH32-0DD0 occupies 70 mm depth, 105 mm width, and 158 mm height — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. The undervoltage release (UVR) is factory-integrated; no separate module occupies adjacent DIN space. The three auxiliary switches (HQ design) provide status feedback for the open/closed and tripped states. If the breaker is mounted in a sealed enclosure above 50 °C, the 200 A rating must be derated per the published curve — at 60 °C it is 188 A, at 70 °C it is 176 A.