The breaking capacity is serious: 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and still 7.5 kA at 690 V. Current rating is temperature-dependent: full 400 A from 40 °C to 50 °C, then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. The 340 A at 70 °C is still a lot of headroom for most feeders.
Physical footprint: 184 mm wide, 248 mm tall, 110 mm deep. The N-conductor protection is adjustable: can be set to OFF, 50%, or 100% of the phase current. That's useful for systems where the neutral doesn't need full protection (e.g., balanced three-phase loads) or where you want to coordinate with downstream breakers. Optional motor drive is available for remote operation — useful if this breaker is in a remote substation or a hard-to-reach location in the plant.
The ETU330 trip unit is the electronic overcurrent release, with adjustable L (long-time), S (short-time), I (instantaneous), and G (ground-fault) protection curves. That's the standard electronic trip for this frame — no communication function on this variant, so no remote monitoring without adding an external module.