What this breaker is and what the ratings mean
The 3VA1450-6EE32-0AA0-ZD00 is a Siemens 3VA1 IEC frame 630 molded-case circuit breaker, 3-pole, rated In=500A with a TM220 thermal-magnetic trip unit (ATFM). The headline breaking capacity is Icu=70kA at 415V — that is class H, meaning it can safely interrupt fault currents up to 70,000 A without welding or rupturing. For a 500A frame, that is a high-interrupt rating, sized for strong utility feeds or transformer secondaries where available fault current is high. Overload protection is adjustable via the TM220: Ir spans 350A to 500A, so you set the long-time pickup to match the cable or load continuous rating. Short-circuit protection is fixed at Ii = 10 x In (5,000 A), which is a magnetic instantaneous trip — good for motor starting inrush or transformer energization without nuisance tripping. The suffix "nut keeper kit for DC Power OEM in China" indicates this variant includes hardware for DC-side mounting and is configured for an OEM application in China. The breaker itself is IEC-rated, so it is suited for global installations where IEC 60947-2 applies.
Lifecycle and sourcing reality
Because it is an active, non-obsolete part, sourcing is straightforward: quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no lead-time guesswork here.
Where it fits in the panel
This is a 3-pole IEC frame 630 breaker — it mounts on a DIN rail or directly to a backplate via the fixed lugs. The TM220 trip unit is field-adjustable, so you can dial Ir without swapping the trip. For a 500A feeder, plan for cable lug size up to 300 mm² or parallel runs; the frame accepts standard busbar connections.