Its interrupting capacity hits 242 kA at 415 V and 330 kA at 240 V, with a sharp drop to 3 kA at 690 V — that 690 V figure tells you this is a 400 V-class breaker, not a 690 V main.
The 4-pole configuration (3 phases plus neutral) is typical for TN-S or TN-C-S systems where you need switched neutral and ground-fault detection on the summation current of L + N conductors. The ground-fault monitoring uses summation current formation on L + N, which means it measures the vector sum of phase and neutral currents — a residual current method. This is a line-protection breaker, not a motor-protection device; it's sized for feeder or sub-distribution duty where the load is a cable or a busway, not an inductive motor start. Communication function is built in, so this variant can talk to a higher-level controller or BMS without an add-on module — useful for remote trip indication or load shedding in a monitored panel.
The 140 mm width is a 4-module footprint on a 25 mm grid — plan for that when laying out the row. Spring-cage terminals accept 0.2–2.5 mm² solid or ferruled stranded; strip length of 8 mm avoids whiskers under the cage. The 3 W maximum power loss is negligible for enclosure heat budgeting, but the 70 °C operating maximum means you can run it in a non-ventilated panel as long as ambient stays under that.