The Siemens 3VA1220-6MH32-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A continuous at 40 °C through 50 °C, with a 3-pole configuration and a dedicated starter protection design — meaning it's built for motor branch-circuit duty where the breaker coordinates with a contactor and overload relay, not just general distribution.
SCCR and thermal derating
The interrupting capacity drops with system voltage: 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 4.5 kA figure at 690 V is the limiting case — if your line-side transformer delivers a 690 V secondary with high fault current, this breaker still clears it, but the margin is tight. Thermal derating starts above 50 °C: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, 176 A at 70 °C. In a sealed panel hitting 60 °C ambient, you lose 12 A of headroom from the 200 A nameplate.
Panel integration
The 105 mm width (4.13 in) and 158 mm height (6.22 in) fit standard MCCB slots in most industrial enclosures; depth is 70 mm (2.76 in). The factory-fitted undervoltage release and two HQ auxiliary switches eliminate the need for separate terminal blocks for status feedback — wire the UVR coil to the safety circuit and the aux contacts to the PLC input card directly.