The Siemens SENTRON 3VA1220-6MH32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for 200 A continuous current, designed for starter protection in motor branch circuits. It carries a 220 kA interrupting capacity at 240 VAC, 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 — the voltage-dependent curve that governs selectivity coordination in a distribution panel. Rated insulation voltage is 800 V, and the breaker holds its full 200 A rating up to 50 °C ambient; above that it derates linearly to 176 A at 70 °C. Maximum power loss is 42 W at rated load — relevant for enclosure thermal rise calculations when grouping several breakers in a panel. This variant ships with a factory-fitted shunt trip (STL) for remote tripping and two HQ auxiliary switches for status feedback to a PLC or safety relay. The basic switch core is order code 3VA12206MH320AA0, so the auxiliary and release options are integrated at the factory, not field-added.
Thermal Derating and Panel Integration
The 3VA1220-6MH32-0KC0 measures 105 mm wide by 158 mm high by 70 mm deep — a standard SENTRON 3VA frame size that fits the Siemens mounting base and busbar system. For a panel OEM or wireman, the 70 mm depth leaves clearance behind a 200 mm deep enclosure door for wiring and accessory access. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The derating curve above 50 °C is the critical figure for an MRO planner or panel builder: at 60 °C the breaker is good for 188 A, at 70 °C for 176 A. If the enclosure ambient hits 65 °C, the 200 A frame must be loaded to no more than 182 A to avoid nuisance tripping.