The Siemens SENTRON 3VA1220-5EF42-0HA0 is a 4-pole molded case circuit breaker (MCCB) rated for 200 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It is configured for line protection — meaning it guards feeders and distribution branches against overload and short-circuit, not motor or generator circuits. The interrupting ratings are substantial: 187 kA at 240 V AC, 121 kA at 415 V AC, 36 kA at 440 V AC, and 17 kA at 690 V AC, so it handles high-fault-current scenarios typical of industrial switchboards and transformer secondaries. The rated insulation voltage Ui is 800 V, giving headroom for 690 V systems.
Temperature derating is flat from 40 °C to 50 °C at 200 A, then drops to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. In a 50 °C panel ambient, no derating is needed; above that, the continuous current must be reduced per the curve. Storage range is -40 °C to 80 °C; operating range is -25 °C to 70 °C.