Breaking capacity reaches 440 kA at 240 V AC, 330 kA at 415 V and 440 V AC, 220 kA at 500 V AC, and 53 kA at 690 V AC — figures that place it in the high-interrupting category for large industrial services or transformer secondary protection.
Neutral protection is adjustable: OFF, 50 %, or 100 % of the phase current, selected via a DIP or rotary on the trip unit. This matters when the neutral conductor is undersized or when you need full neutral protection on a 4-pole breaker feeding a non-linear load. The ETU350 release offers an adjustable short-time delay response time (tr) from 0.5 s to 17 s, enabling selective coordination with downstream breakers. The –40 °C lower limit supports cold-climate installations without auxiliary heating.
Dimensions are 181 mm height, 140 mm width, 86 mm depth.