What the interrupting ratings mean for your panel
The Siemens 3VA1220-6GF42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated 200 A continuous with a TM240 thermal-magnetic release. Its interrupting capacity varies sharply 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 17 kA at 690 V. That means at 415 V it clears a 154 kA fault without upstream fuses needing to open — selectivity headroom for a main or feeder position in a distribution board. The 800 V rated insulation voltage (Ui) confirms it is built for 690 V line-to-line industrial supplies.
Thermal derating — where the 200 A holds and where it tapers
The 200 A rating is flat from 40 °C through 50 °C ambient. At 55 °C it derates to 194 A, at 60 °C to 188 A, at 65 °C to 182 A, and at 70 °C to 176 A. If the panel ambient stays under 50 °C, no derating applies. Above that, the TM240 release tracks the thermal curve — the breaker will trip earlier in a hot enclosure if you load it to the full 200 A. For a 200 A continuous load in a 60 °C switchroom, budget for the 188 A limit or select the next frame up.
Panel fit and integration
Dimensions are 158 mm high, 140 mm wide, 70 mm deep. The 4-pole body occupies a standard MCCB footprint on a DIN rail or mounting plate. IP40 on the front means it is protected against solid objects over 1 mm but not sealed against moisture — keep it inside a panel enclosure. The 100 % N-conductor protection design means the neutral pole is rated for full phase current, not reduced; that matters for 4-wire feeders with harmonic content.
Power loss and auxiliaries
Maximum power dissipation is 42 W. That is the heat the breaker dumps into the enclosure at full load; factor it into the panel thermal budget. The product extension entry notes a motor drive option is available for remote trip/close, but this base order code ships without communication function or ground-fault monitoring.