The Siemens 3VA1450-6EF32-0AA0-ZD00 is a 3-pole IEC frame 630 circuit breaker from the 3VA1 series, with a breaking capacity class H rated at Icu=70kA @ 415V. It's configured for line protection with a TM240 thermal-magnetic trip unit, ATAM, and an In=500A rating. Overload protection (Ir) is adjustable from 350A to 500A, and short-circuit protection (Ii) is set at 5 to 10 times In. This variant includes a nut keeper kit and is specified for a DC Power OEM in China.
What the Ratings Mean for Fit
The 70kA Icu at 415V is the ultimate short-circuit breaking capacity — the breaker can safely interrupt a fault current up to that level once and still carry rated current afterward. For a 500A frame, that's a high-capacity class H rating, suited for industrial distribution panels with high available fault current. The adjustable Ir (350A to 500A) lets you dial in the overload protection to match the downstream load without swapping trip units. The Ii range of 5 to 10 x In means the magnetic short-circuit pickup is set between 2500A and 5000A, which avoids nuisance tripping on motor inrush while still clearing hard faults.
Panel Integration
This is a 3-pole IEC frame 630 breaker — it mounts on a DIN rail or can be bolted into a panel. The nut keeper kit included with this variant is a small but practical detail: it prevents the mounting nuts from dropping into the enclosure during installation, saving a few minutes on the line. For a DC Power OEM build in China, that kit is already spec'd in.