The Siemens SENTRON 3VA1220-5GF42-0HA0 is a 4-pole molded case circuit breaker rated for 200 A continuous current at 40 °C, with a TM240 thermal-magnetic release that handles both overload and short-circuit protection in one device. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V — so at typical 400 V distribution levels it clears fault currents up to 121 kA without upstream fuses. Rated for line protection duty, not motor or generator protection.
Derating and thermal behavior in the enclosure
Above that it derates linearly: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, 176 A at 70 °C. If your panel internal ambient runs 55 °C, you lose 6 A — plan the load side accordingly. The 70 mm depth and 140 mm width fit standard Siemens SENTRON mounting footprints; no special adapter plate needed for DIN-rail or screw-fixed installation.
Auxiliary trip and release options
If you need remote undervoltage release or status feedback, you'll add external modules. The 100% N-conductor protection rating means the neutral pole is fully rated — no derating needed for 4-wire systems with balanced or unbalanced loads.