What this MCCB is and what the ratings mean for fit
The Siemens SENTRON 3VA1220-5MH32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 200 A continuous current at up to 50 °C ambient — the full 200 A holds through 50 °C, then derates to 192 A at 55 °C, 188 A at 60 °C, 184 A at 65 °C, and 180 A at 70 °C, so in a hot panel you size against the derated figure, not the nameplate. It carries a TM120M thermal-magnetic release — the thermal element handles overloads, the magnetic element handles short-circuits — and is designated as a starter protection version, meaning it is optimized for motor-starting duty where high inrush must not cause nuisance trips. The interrupting ratings are 187 kA at 240 V, 121 kA at 415 V, 30 kA at 440 V, and 17 kA at 690 V — these are the maximum fault currents the breaker can safely clear at those voltages, so for a 415 V supply you need the available fault current at the panel to be at or below 121 kA. Rated insulation voltage Ui is 800 V, and the operating power at AC-3 duty (motor switching) at 400 V is 75 W — a figure that matters for coordination with upstream protection.
Panel integration and physical fit
Dimensions are 105 mm wide, 158 mm high, and 70 mm deep — the 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame, so it fits existing panel cutouts and busbar spacing designed for the 3VA family. Protection class on the front is IP40 — suitable for general-purpose indoor panels; not rated for washdown or outdoor exposure without an additional enclosure.
Auxiliary and trip options
It comes with 2 auxiliary switches plus 1 trip alarm switch (HQ version), and a shunt trip release (STL) is integrated — the shunt trip allows remote tripping via a separate control signal. The integrated auxiliary trip order code is 3VA9688-0BL32 — a factory-fitted accessory that should match the BOM if a replacement is needed. No undervoltage release, no communication function, no phase failure detection, and no ground fault monitoring are included — this is a straightforward thermal-magnetic breaker without electronic trip unit or network connectivity.