Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — numbers that tell you it handles high-fault-current main feeders and large motor branch circuits without cascading upstream. The ETU860 gives adjustable long-time pickup (Ir) up to 800 A and short-time delay (tsd) from 0.05 s to 0.5 s, letting you coordinate selectively downstream. It carries a communication function for remote monitoring or trip-event capture, and ground-fault monitoring via summation-current formation on the line conductor.
Sizing into the panel — footprint and thermal derating
The breaker measures 210 mm wide by 320 mm tall by 120 mm deep. That 210 mm width means it occupies three full 70 mm pole spaces on a standard DIN-rail or panel-mount backplate — verify your enclosure's gland-plate fill before committing the cutout. At 40 °C through 60 °C ambient the 800 A rating holds flat; at 65 °C it derates to 767 A, at 70 °C to 703 A.