Breaking capacity sits at 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 52.5 kA at 690 V — numbers that tell you this is a high-interrupting frame meant for fault levels near the transformer secondary, not a branch feeder.
At 160 A continuous, this MCCB handles motor loads up to roughly 90 kW at 400 V three-phase (assuming a 0.85 PF and 0.95 efficiency) — a common size for a medium pump, compressor, or conveyor drive. The thermal derating curve starts at 55 °C: 153.6 A at 55 °C, 150.4 A at 60 °C, 147.2 A at 65 °C, and 144 A at 70 °C.
What the ETU350M trip unit does
The ETU350M is an electronic overcurrent release designed for motor protection — it provides adjustable overload protection (thermal memory), short-circuit protection, and ground-fault alarm (not trip, since this variant ships without ground-fault monitoring). Maximum power loss is 75 W — plan ventilation if the breaker is enclosed with other heat sources.