What this MCCB delivers in a panel
The Siemens 3VA1220-6MH32-0JA0 is a 3-pole SENTRON molded case circuit breaker rated for a continuous current Iu of 200 A, with a breaking capacity of 220 kA at 240 V and 154 kA at 415 V. That 220 kA figure at 240 V puts it in the high-interrupting category — it clears severe fault currents without cascading upstream, which matters when you're coordinating a distribution board with a transformer secondary that can dump that kind of energy. The starter protection version (product version field) means the TM120M thermal-magnetic release is tuned for motor-starting inrush, not just feeder protection. It carries a shunt trip release (STL) as the auxiliary release, so you can remotely trip it via a control signal — useful for emergency-stop chains or interlocking with a safety PLC. No undervoltage release, no communication module, no auxiliary contacts on this variant; it's a clean, hardwired breaker for a motor control center or a dedicated pump panel. The rated insulation voltage Ui is 800 V, and the operating power at AC-3 duty at 400 V is 75 W — that AC-3 rating confirms it's designed to switch motor loads under load, not just isolate a dead circuit. IP40 on the front means it's protected against solid objects over 1 mm but not sealed against moisture; keep it inside a dry enclosure.
Thermal derating and ambient conditions
The 200 A rating holds flat from 40 °C to 50 °C. Above that it starts to derate: 192 A at 55 °C, 188 A at 60 °C, 184 A at 65 °C, and 180 A at 70 °C. If your panel ambient runs hot — say next to a VFD cabinet or a transformer — you need to account for that derating at the design stage, not after commissioning. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical fit and mounting
The breaker measures 105 mm wide, 158 mm high, and 70 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it fits the same panel cutout and bus-bar spacing as other 3VA 3-pole units. The 70 mm depth leaves room for rear-connected bus bars or a panelboard gutter. No auxiliary contact block is included; if you need one, the integrated auxiliary trip order code is 3VA9688-0BL32.