What the interrupting ratings mean for your panel
The Siemens 3VA1150-4EE36-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for line protection — meaning it sits on the incoming feed, not on a motor or feeder branch. Its continuous ampacity is 50 A at 40 °C, and it holds that full rating up through 50 °C; above that it derates smoothly to 45 A at 70 °C. The interrupting capacity is what decides whether this breaker clears a fault without blowing up: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA figure at 240 V means it can handle high available fault currents common on large transformer secondaries — useful if you are replacing an older breaker in a panel with stiff supply.
Physical fit and panel integration
The breaker measures 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB footprint that drops into most existing panel cutouts without modification. The front face carries an IP40 protection rating, so it is suited for indoor, dry enclosures; not for washdown or outdoor exposure. The TM220 overcurrent release is a fixed thermal-magnetic design — no interchangeable trip units, which simplifies ordering but means the trip curve is set at the factory.
Compliance documentation
The SENTRON 3VA series carries the usual Siemens compliance package: RoHS, REACH, UL, and IEC certifications are standard for this brand. Specific declarations are available through the Siemens support portal using this order code.