The Siemens 3VA1450-6GE42-0AA0-ZD00 is a 4-pole IEC frame 630 circuit breaker with a 500 A rated current and a 70 kA breaking capacity at 415 V (class H). The TM220 thermal-magnetic trip unit provides adjustable overload protection from 350 A to 500 A and a fixed short-circuit pickup of 10 x In. This variant includes 100% N-conductor protection and a nut keeper kit, specified for a DC Power OEM in China.
That class H rating places it above standard distribution breakers — it handles high-fault scenarios without cascading upstream. The adjustable Ir (350–500 A) lets you match the breaker to the actual load without swapping trip units, useful when the connected load isn't exactly 500 A. The fixed Ii of 10 x In (5000 A) means the magnetic trip clears hard faults fast; for lower-level overloads, the thermal element handles the time curve.