The Siemens SENTRON 3VA2125-7MS32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, with an adjustable overload and short-circuit trip range from 75 A minimum to 375 A maximum. It uses the ETU310M electronic trip unit, which is a microprocessor-based release designed for motor and starter protection — the 'M' in the designation stands for motor protection, meaning the trip curve is shaped to handle inrush without nuisance tripping while still providing fast fault clearing. This MCCB sits in the SENTRON family, Siemens' standard line for distribution and motor branch circuits in industrial panels. The 3VA platform replaced the older 3VL series and is current-production, so it's what you'll get on a new BOM or as a like-for-like replacement in an existing SENTRON panel.
At 240 V AC this breaker handles 330 kA — that's extremely high, typical for a feeder breaker close to a large transformer or in a high-fault-current industrial service entrance. At 415 V and 440 V it's still 242 kA, dropping to 187 kA at 500 V, and 3.7 kA at 690 V.
Thermal performance and environment
Maximum power loss is 0.6 W, negligible for panel thermal budgeting.