The Siemens 3VA1220-6MH32-0AC0 is a SENTRON molded case circuit breaker (MCCB) in the starter protection version, rated for 200 A continuous current across a 3-pole configuration. It carries a TM120M thermal-magnetic release — a fixed-trip unit that combines a thermal bimetal for overload protection with a magnetic coil for short-circuit interruption. That 200 A rating holds flat from 40 °C to 50 °C, then derates to 180 A at 70 °C, so it's sized for a warm enclosure without oversizing the frame.
Breaking capacity — what the voltages tell you
This MCCB delivers 220 kA at 240 V, 154 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. Those are the interrupting ratings at each voltage level — the part clears a fault up to that prospective short-circuit current without welding or rupturing. The steep drop between 415 V and 440 V (154 kA to 36 kA) is typical of a thermal-magnetic breaker hitting its voltage-limited arc-extinction ceiling; at 690 V it still holds 17 kA, which covers most industrial motor branch circuits on a 690 V distribution system.
Panel fit and auxiliary contacts
The 3VA1220-6MH32-0AC0 measures 105 mm wide, 158 mm high, and 70 mm deep — a standard 3-pole MCCB footprint for a 200 A frame. It ships with two auxiliary switches (HQ type) built in, so you get status feedback without adding a separate side-mount block. IP40 on the front means it's protected against tools and wires >1 mm entering the face, but it's not sealed against hose-down — keep it inside a panel enclosure rated for the environment.
Motor duty and operating power
Rated operating power at AC-3 duty (motor switching) is 75 W at 400 V. That's the load it can switch under the IEC utilization category for squirrel-cage motors — starting and disconnecting while running. For a 200 A frame, 75 W at 400 V translates to roughly 110 A motor full-load current, so the breaker is oversized for the motor branch and the TM120M trip unit provides the overload protection.