The Siemens SENTRON 3VA2125-6KP36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, built around the ETU850 electronic trip unit.
This MCCB delivers 242 kA breaking capacity at 240 V, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V (3.7 kA) means it's not the right choice for 690 V distribution with high available fault current; that's where a higher-rated frame or a current-limiting fuse would be needed.
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard 3-pole MCCB footprint for this SENTRON frame size. The 86 mm depth includes the case body; account for wiring space behind the panel door.
Trip unit and protection characteristics
The ETU850 electronic trip unit supports adjustable overload and short-circuit settings. Power loss is 0.6 W.