Four poles, with the ETU350 electronic trip unit giving you adjustable time-current curves (tr min 0.5 s, tr max 17 s) and N-conductor protection configurable to OFF or 100 %. What makes this one stand out is the interrupting capacity: 242 kA at 240 V, 187 kA at 415 V and 440 V, still 121 kA at 500 V.
That 140 mm width on a 4-pole MCCB is standard for the SENTRON 3VA2 frame — it'll drop into the same panel cutout and bus-bar spacing as other 4-pole units in the series.
The ETU350 electronic trip gives you adjustable long-time pickup and delay, short-time pickup, and instantaneous settings — that's selectivity headroom downstream. Power loss is 4 W max, negligible for thermal budgeting inside the panel.