Rating and trip-unit profile
The ETU350 electronic trip unit provides adjustable long-time (tr) and short-time (tsd) delay settings — tr from 0.5 to 17, tsd from 0.02 s to 0.4 s — letting you shape the trip curve to the load without swapping the breaker. Neutral protection is configurable as OFF, 50 %, or 100 % of the phase setting. Breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415 V, 55 kA at 440 V, 36 kA at 500 V, and 9 kA at 690 V. Current rating holds flat at 400 A from 40 °C through 50 °C ambient, then derates to 384 A at 55 °C, 372 A at 60 °C, 356 A at 65 °C, and 340 A at 70 °C.
Footprint is 184 mm wide by 248 mm tall by 110 mm deep. The 184 mm width (7.2 in) is the critical dimension for DIN-rail or panel-mount spacing — it occupies roughly four 45 mm pole positions. Rated insulation voltage Ui is 800 V, and the operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C.