It sits in the SENTRON family, which is Siemens' standard line for distribution and motor-circuit protection in industrial panels. Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V, and 76 kA at 500 V — numbers that put it in the high-interrupting category for a 100 A frame. At 690 V it still clears 3 kA, which covers most 690 V distribution applications. The ETU850 release allows adjustable long-time delay (0.5 to 25 s) and N-conductor protection settings (OFF, 20 % to 100 %), giving selectivity coordination flexibility on a main or feeder breaker.
Dimensions: 181 mm height, 140 mm width, 86 mm depth. Maximum power dissipation is 13.5 W at rated load, so ventilation in a sealed enclosure is worth checking if multiple breakers are ganged.