What the 200 A rating means for panel fit
The Siemens SENTRON 3VA1220-5EF32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated 200 A continuous at 40 °C, carrying the full 200 A through 50 °C before derating begins — at 55 °C it holds 194 A, at 60 °C 188 A, at 65 °C 182 A, and at 70 °C 176 A. That derating curve matters for a panel that runs warm: the breaker does not force a larger frame just because ambient hits 50 °C. The 121 kA breaking capacity at 415 V (187 kA at 240 V, 75.6 kA at 440 V, 30 kA at 500 V, 17 kA at 690 V) means it can interrupt a fault of that magnitude without upstream coordination failure — sized for high-fault industrial distribution. The TM240 thermal-magnetic release provides inverse-time overload and instantaneous short-circuit protection, and the integrated shunt trip (STL) allows remote tripping for emergency-stop or supervisory control.
Line protection design and shunt trip
The shunt trip release (STL) operates on a separate control voltage, allowing the breaker to be opened by a remote pushbutton, PLC output, or safety relay.
Mounting dimensions and panel integration
The 3VA1220-5EF32-0KA0 measures 105 mm wide, 158 mm high, and 70 mm deep — a standard 3-pole MCCB footprint for SENTRON 3VA frames.