At 415 V and 440 V it still holds 121 kA, dropping to 79 kA at 500 V and 5.1 kA at 690 V. For a sourcing decision: at 240 V this breaker sits in the high-interrupting class, suitable for large transformer-fed services or high-fault industrial feeds where SCCR headroom is non-negotiable.
Thermal derating and continuous current — what the curve tells you
At 55 °C it drops to 238 A, at 60 °C to 225 A, and at 65 °C to 213 A, hitting 200 A at 70 °C. The maximum power loss is 48 W, which feeds into enclosure thermal calculations.
ETU850 trip unit and auxiliary contacts
The trip indicator is not fitted, so visual flag at the breaker face is absent — rely on the aux contacts or comms for trip status.