Three poles, fitted with an ETU860 electronic trip unit. The ETU860 brings adjustable long-time (tr 0.5–25 s) and short-time (tsd up to 0.5 s) response values, plus ground-fault monitoring via summation current formation on the L-conductor. That makes it suitable for feeders where selective coordination and earth-leakage detection are required — common in process plant sub-distribution.
Rated breaking capacity is 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.8 kA at 690 V. At 690 V the capacity drops sharply to 3.8 kA, so verify your system's prospective fault current at that voltage before specifying.
Maximum power loss is 1.6 W — negligible for thermal budgeting inside a panel.