The Siemens 3VA1225-6EF32-0AA0-ZD00 is a 3-pole IEC frame 250 circuit breaker from the 3VA1 series, rated with a high breaking capacity class H — Icu of 70 kA at 415 V. That 70 kA interrupting rating means it can safely clear a bolted fault up to that level without upstream devices needing to coordinate, which is the spec that decides whether this breaker holds in a high-fault panel or blows through. The TM240 thermal-magnetic trip unit gives adjustable overload protection (Ir = 175 A to 250 A) and fixed short-circuit pickup (Ii = 5 to 10 × In), so you set the continuous current to match the load and let the magnetic trip handle the fault. This variant also includes a nut keeper kit, specified for DC Power OEM applications in China.
What the ratings mean for fit
The 70 kA Icu at 415 V is the headline number for selectivity studies — it tells the panel designer that this breaker can interrupt a 70 kA prospective fault current without external current-limiting fuses, which simplifies coordination in a main or feeder position. The adjustable Ir band (175–250 A) lets you dial in the exact continuous current for a 250 A bus or a motor circuit without changing the breaker frame. The short-circuit pickup range (5–10 × In) means the magnetic trip fires between 1250 A and 2500 A, so it rides through motor inrush but clears a hard fault fast.
Integration notes
Mounts on a standard DIN rail or panel-mount base in the switchboard. The nut keeper kit is a mechanical detail — it retains the terminal nuts during wiring, which saves time on a production line or during panel assembly. The 3-pole form factor fits a standard 3-pole MCCB footprint; verify the busbar pitch and terminal clearance for your specific enclosure.