3VA1220-5MH32-0AG0 — IEC Frame 250 Breaker, 55 kA @ 415 V
The Siemens 3VA1220-5MH32-0AG0 is a 3-pole IEC frame 250 circuit breaker rated In=200A, with a breaking capacity class M delivering Icu=55kA at 415 V. That 55 kA interrupting rating means it can safely clear a fault current of that magnitude without upstream devices needing to trip — critical for selectivity in a distribution panel where downstream breakers are coordinated to isolate only the faulted branch. It carries starter protection TM120M, AM — a thermal-magnetic trip unit with a fixed thermal element (no overload adjustment) and an adjustable magnetic short-circuit pickup Ii=6...14 x In. This is sized for motor starter protection: the thermal element tracks motor heating, while the magnetic pickup is set above the motor's inrush to avoid nuisance trips on start. The breaker includes a nut keeper kit, one auxiliary switch HP, and one trip alarm switch HP. The auxiliary switch signals the breaker's ON/OFF status; the trip alarm switch signals only when the breaker has tripped on fault — useful for remote annunciation on a motor control center (MCC) or PLC input.
What the Ratings Mean for Fit
Starter protection TM120M means no separate overload relay is needed for the motor branch. The adjustable magnetic pickup (Ii=6...14 x In) lets you set the short-circuit threshold to ride through motor starting current without tripping.
Panel Integration
Mounts on a DIN rail or direct panel via the frame's mounting footprint. The nut keeper kit holds the terminal nuts captive during wiring — saves time on assembly when you're landing 200 A cable lugs in a tight enclosure.