Three poles, motor protection design with integrated phase failure detection and an undervoltage release (UVR) built in. That UVR means the breaker trips if control voltage drops, which is standard for motor starter feeder circuits where loss of control power should drop the load. Breaking capacity hits 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The 3.7 kA at 690 V tells you this is a 600 V class frame, not a full 690 V performer; at that voltage the breaker is basically a disconnect, not a fault-interrupting device. That 105 mm width is a three-pole frame — fits standard panel cutouts for 100 A MCCBs. This is a straight motor-protection breaker with undervoltage release; if you need remote trip indication or GF protection, you step up to a different 3VA2 variant.
The undervoltage release coil needs a separate control power feed; verify polarity on the UVR terminals if using DC control voltage. Phase failure detection is internal, no extra module required.