200 A MCCB with starter protection — what the ratings mean for fit
The Siemens SENTRON 3VA1220-6MH32-0AF0 is a 200 A, 3-pole molded case circuit breaker designed for starter protection — meaning it's built to coordinate with motor starters and protect against overloads and short circuits in motor branch circuits, not just general distribution. The TM120M thermal-magnetic release gives you fixed thermal pickup and magnetic trip settings tuned for motor starting inrush, so it won't nuisance-trip on a 6x locked-rotor current. The interrupting ratings tell you where this breaker can be applied: 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 a high-fault-capacity breaker for strong utility feeds or transformer secondaries. At 200 A continuous, it carries full load without derating up to 50 °C; above that, the thermal curve steps 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 ambient runs hot, that derating is the number that governs the real ampacity.
Panel fit and integration — dimensions and wiring
The breaker measures 105 mm wide, 158 mm high, and 70 mm deep — a standard three-module MCCB footprint for Siemens SENTRON panels. It ships with one auxiliary switch and one trip alarm switch (HQ type) pre-installed, so you get remote status indication without adding a separate accessory block. The rated insulation voltage is 800 V, giving headroom for 690 V systems. Maximum power loss is 42 W at rated current — factor that into enclosure ventilation if you're packing multiple breakers in a confined panel.