Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V — so it handles high-fault scenarios at typical distribution voltages without cascading upstream. The ETU350 trip unit gives you adjustable thermal-magnetic or electronic protection curves, depending on the variant; here it's set for line (cable/feeder) protection. That means it clears overcurrents and short-circuits fast enough to protect downstream conductors, not just the breaker itself.
At 55 °C it derates to 96.25 A, at 60 °C to 92.5 A, at 65 °C to 88.75 A, and at 70 °C to 85 A. Maximum power loss is 10 W.
The shunt trip (STL) is wired separately from the main power path — it needs a control voltage to hold the breaker closed; removing voltage trips it. The auxiliary contacts (2 NO/NC + 1 trip alarm) are rated for standard control circuits and share the same terminal block.