What the interrupting ratings mean for your fault duty
The 3VA2025-6KQ32-0AA0: This breaker clears 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and still holds 3 kA at 690 V. At 690 V the 3 kA figure is a derate; if your system runs that voltage with fault currents above 3 kA, step up to a higher-rated frame.
No derating curve to calculate — the ETU860 handles it electronically. Ambient at 70 °C is common inside sealed cement-plant or steel-mill enclosures; this breaker eats the dust and runs without a current haircut.
Trip unit and protection features
The ETU860 electronic overcurrent release gives you adjustable N-conductor protection (OFF, 40% to 160% of Iu) and ground-fault monitoring via summation current formation on the L-conductor. Communication function is onboard, so it talks to a higher-level system for metering and trip events. No undervoltage release, no voltage trigger, no trip indicator on this variant — those are separate accessory add-ons.