Dimensions: 181 mm high, 105 mm wide, 86 mm deep — that 105 mm width is three pole spaces at 35 mm per pole, so it occupies the same footprint as any 3-pole SENTRON 3VA2 frame.
No trip indicator, no communication function, no phase failure detection, no ground fault monitoring — this is a straight line-protection breaker with a voltage trigger (shunt trip) for remote opening. The ETU350 release gives you adjustable long-time, short-time, and instantaneous pickup settings, plus ground fault protection if you add the optional module (this unit ships without it). Latching endurance is 20,000 operations — that's the mechanical life, not the electrical life under load, but it tells you the mechanism is built for a long service interval.