The ETU850 trip unit provides adjustable overcurrent protection with communication and measurement functions, giving you visibility into load conditions and enabling remote monitoring or coordination with upstream devices. Rated insulation voltage is 800 V, and the breaker carries a maximum breaking capacity of 330 kA at 240 V AC, stepping down to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V — a strong SCCR profile for high-fault industrial services.
Selectivity and coordination — the so-what of the ratings
With a minimum continuous current setting of 150 A and a maximum of 1 200 A, the ETU850 covers a wide adjustment band, but note that the breaker's own frame is 100 A continuous — the trip unit settings govern the protection curve, not the frame rating. The 330 kA at 240 V makes this breaker suitable for service entrance or large sub-feed applications where fault current is high; the drop to 3.7 kA at 690 V means it is not intended for primary 690 V distribution in high-fault scenarios — verify the available fault current at your system voltage.
Physical fit and integration notes
Dimensions are 181 mm height, 105 mm width, and 86 mm depth (7.13 × 4.13 × 3.39 inches).