Three poles, with phase failure detection built in.
The interrupting rating hits 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V. That 330 kA at 240 V is high enough for most secondary-side transformer feeds or large busway taps; the steep drop to 7.5 kA at 690 V means this breaker is not intended for 690 V motor circuits unless the available fault current is tightly controlled.
The width (138 mm) is a three-pole frame; verify the mounting footprint against your existing backpanel — it may require a different cutout than older 3VA2 frames.