What this MCCB delivers — and the ratings that decide the fit
The Siemens 3VA1220-5MH32-0BC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) in the starter protection version, carrying a rated continuous current Iu of 200 A and a rated insulation voltage Ui of 800 V. The headline number for a sourcing decision is the interrupting capacity: 187 kA at 240 V, 121 kA at 415 V, 30 kA at 440 V, and 17 kA at 690 V. That means this breaker can safely clear a fault up to 187 kA on a 240 V line — high enough for most industrial main feeders and large sub-distribution boards where the available fault current is substantial. The thermal-magnetic release is a TM120M, sized for motor and starter protection duty. The 200 A rating holds flat from 40 °C through 50 °C (200 A at each), then derates to 192 A at 55 °C, 188 A at 60 °C, 184 A at 65 °C, and 180 A at 70 °C. For a panel builder, that means no headroom loss in a typical 40 °C enclosure — but if the ambient inside the cabinet runs above 50 °C, you lose roughly 2 A per 5 °C rise. The operating temperature range is -25 °C to 70 °C; storage spans -40 °C to 80 °C. Front protection is IP40, so it's sealed against tool entry but not washdown.
Integration and auxiliary hardware
The breaker ships with an undervoltage release (UVR) as the auxiliary release design, and it comes with 2 HQ auxiliary switches. The integrated auxiliary trip is order code 3VA9608-0BB11. The latching endurance is rated at 15,000 operations. The operating power at AC-3 duty at 400 V is 75 W — that's the motor-switching capability under the starter protection version. For a site electrical engineer, the key takeaway: this breaker is built for motor branch circuits where the TM120M release provides the thermal memory for starting inrush and the magnetic trip for short-circuit protection, not for pure distribution feeder duty.