What this 200 A MCCB does in a panel
The Siemens SENTRON 3VA1220-6MH32-0DH0 is a 3-pole molded case circuit breaker rated for a continuous 200 A. It's designed for starter protection — meaning it handles motor branch circuits where you need coordinated overload and short-circuit protection in one package. The interrupting capacity drops as line voltage climbs: 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's enough for most industrial distribution panels, but at 690 V you're near the low end — verify the available fault current at that voltage before committing the BOM line.
Thermal derating — what the numbers mean for a real panel
This breaker holds its full 200 A rating up to 50 °C ambient. Above that it starts stepping down: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. If your panel sits near a hot motor starter or in a non-ventilated enclosure, that 176 A at 70 °C is the number to size against — not the 200 A on the nameplate. The power loss at full load is 44.5 W, which adds to the enclosure's heat budget.
Auxiliary wiring and undervoltage release
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ), and an undervoltage release (UVR). The UVR drops the breaker if control voltage falls — common on safety circuits or emergency-stop chains where you need the load to drop on power loss. The auxiliary contacts let a PLC or status lamp read the breaker position without climbing into the main lugs.