The interrupting ratings are what define its fault-clearing capability: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V. The ETU350 electronic trip provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a fixed thermal-magnetic characteristic, which matters when you need selectivity downstream.
Above that, it derates linearly: 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. The 105 mm width and 86 mm depth fit standard SENTRON panel cutouts; the 181 mm height clears most distribution enclosures without a sub-feed adapter. Maximum power loss is 13.5 W — a figure to check against enclosure thermal rise if you're packing multiple breakers in a sealed cabinet.