What it is and where it fits
The Siemens SENTRON 3VA2010-5KP46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, built around the ETU850 electronic trip unit. It sits in the SENTRON family, which is Siemens' standard line for distribution and motor-circuit protection in industrial panels. The 100 A rating holds flat across the full ambient temperature range from 40 °C to 70 °C — no derating needed in a warm enclosure. 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.
Physical fit and panel integration
Dimensions: 181 mm height, 140 mm width, 86 mm depth. The 86 mm depth is the body only — account for handle throw and wiring space behind the panel door. The 140 mm width is standard for a 4-pole MCCB in this frame size; it drops into a typical SENTRON mounting base with no adapter plate. Front protection is IP40 — suitable for clean indoor panels; not rated for washdown or outdoor exposure. Operating temperature range spans -40 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power dissipation is 13.5 W at rated load, so ventilation in a sealed enclosure is worth checking if multiple breakers are ganged.