The Siemens SENTRON 3VA1220-5EF32-0AF0 is a 3-pole molded case circuit breaker rated for 200 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V — figures that place it in high-fault-duty distribution panels where upstream transformer capacity or parallel feeds drive available fault current above typical 65 kA MCCB ratings. The 200 A rating holds flat from 40 °C through 50 °C, then derates to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. Dimensions are 105 mm wide by 158 mm high by 70 mm deep.
Interrupting capacity and selectivity planning
At 440 V the breaker clears 36 kA; at 690 V it clears 17 kA.
The 105 mm width occupies three module spaces, leaving room alongside for a disconnect or meter in a typical 24-module distribution board. Latching endurance is rated at 15,000 operations — sufficient for main breaker duty where switching cycles are infrequent. The storage minimum matters for unheated warehouses in cold climates — the breaker can be stored at -40 °C without damage, but must be at -25 °C or above before energizing.