What this breaker delivers
The Siemens 3VA2225-5HL32-0AL0 is a 3-pole IEC frame 250 molded case circuit breaker with a 55 kA interrupting capacity at 415 V AC — class M breaking capacity, meaning it handles high fault currents typical of industrial main or feeder panels without cascading upstream. The ETU320 LI electronic trip unit gives you adjustable overload protection (Ir = 100 A to 250 A) and short-circuit pickup (Ii = 1.5 to 10 x In), so you tune the trip curve to the load rather than swapping breaker frames.
The nut keeper kit prevents hardware loss during installation, which speeds up panel assembly when you're running multiple breakers side by side.