The Siemens 3VA1225-1AA32-0JH0 is a SENTRON 3VA1 switch disconnector in an MCCB design — it provides visible isolation and load-break capability without overload or short-circuit protection. Rated continuous current Iu is 250 A, so it handles full-load current on a feeder or a large motor branch circuit where the upstream device provides the protection. The 3-pole unit is sized for 690 V AC 50/60 Hz or 500 V DC maximum operational voltage.
Rated short-time withstand current is 3 kA at both 1 s and 0.5 s intervals. That figure tells you the disconnector can hold closed through a fault of that magnitude long enough for an upstream breaker to clear — it's not a short-circuit making or breaking rating, but a withstand rating for coordination studies. In a selective coordination chain, this part sits downstream of a device that can interrupt a fault above 3 kA.
Built-in auxiliary and trip options
That means remote tripping and status feedback are wired in from the start — no field-add kit needed. The shunt trip lets a safety PLC or E-stop circuit open the disconnector remotely. Three CO contacts are available for auxiliary signaling.
Panel footprint and connection
Measures 105 mm wide, 158 mm high, 70 mm deep. Main circuit connection is busbar via front terminals — typical for panelboard or switchboard mounting where busbars run horizontally across the front. IP40 on the front face (finger-safe, not washdown).