The interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — figures that govern fault-clearing capability at the service entrance or main feeder. The ETU350 allows adjustable long-time pickup (Ir) from 0.5 to 1.0 × In and short-time delay (tsd) from 0.04 to 0.4 s, which gives the coordination engineer room to shape the trip curve for selective coordination with downstream breakers.
Thermal derating and continuous current
At 60 °C it derates to 955 A, at 65 °C to 885 A, and at 70 °C to 815 A.
Dimensions are 320 mm high, 210 mm wide (8.3 in), and 120 mm deep. Width at 210 mm is the horizontal footprint for multi-breaker lineup spacing. The breaker is designed for screw-mounting in a switchboard; no DIN-rail clip is involved at this frame size.