At 415 V and 440 V it still handles 242 kA, and at 690 V it's rated 52.5 kA. For a site electrical engineer sizing for selectivity, those figures tell you this breaker sits upstream in a high-fault-current distribution — think transformer secondary or large motor feeder — where downstream breakers need to coordinate without cascading. The 100 A rating holds flat from 40 °C up to 50 °C, then derates to 90 A at 70 °C, so panel ambient temperature matters for continuous loading.
The 3-pole form factor fits a 3-module-wide cutout in most switchboard chassis. Phase failure detection is built into the ETU350M — no separate voltage monitor needed for motor protection. The shunt trip release requires a control voltage to trip; it's not an undervoltage release (that's a separate variant), so plan the control wiring accordingly.
Thermal and environmental limits
The breaker has no auxiliary contact built in (order separately if you need status feedback), and no communication module onboard. It's a standalone protection device, not a smart breaker.