What the ratings mean for your panel
The Siemens SENTRON 3VA2450-7MN32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 500 A across the ambient range from 40 °C to 50 °C, then derating to 480 A at 70 °C. That 500 A frame holds steady without a temperature-related trip in a warm cabinet — the thermal curve doesn't start pulling current until 55 °C, where it steps to 495 A. The ETU350M trip unit provides motor protection with phase failure detection, a voltage trigger, and a trip indicator. It's the version you want when the breaker is the primary overcurrent device ahead of a motor starter — the electronic trip gives adjustable curves that coordinate with the starter's overload relay. Breaking capacity is 330 kA at 240 V, 242 kA at 415 V and 440 V, and 52.5 kA at 690 V. At 415 V — the common industrial distribution voltage — that 242 kA SCCR means it safely interrupts a fault at that level without cascading upstream, provided the panel's bus bracing and upstream device are coordinated for it. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ type). The shunt trip (STL) release is built in — no separate undervoltage release fitted. No communication function, no ground fault monitoring. This is a straight motor-protection breaker for a fixed-speed load, not a power-monitoring or ground-fault device.
Panel fit and mounting
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. Front IP40 protection means the breaker face is protected against tools and wires >1 mm, but not against water ingress — it belongs inside a panel, not in a washdown zone.