The Siemens 3VA2125-6HN32-0AA0 is a SENTRON 3-pole molded case circuit breaker rated for 25 A continuous current, designed for line protection with an ETU350 electronic overcurrent release.
Breaking capacity and selectivity
Breaking capacity is voltage-dependent: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. That 242 kA at 240 V means this breaker can interrupt nearly a quarter-million amps under a bolted fault at that voltage — critical for high-fault-current panels fed close to a transformer. Rated insulation voltage is 800 V, so the breaker's internal clearance and creepage are sized for 690 V line-to-line systems with margin. The ETU350 electronic trip unit allows adjustable overload and short-circuit protection curves, giving the engineer selectivity coordination options a fixed-thermal breaker cannot match.
Deployment context
Front protection is IP40, meaning tools or fingers won't contact live parts from the front face, but the breaker is not sealed against dust ingress — install in a panel with an IP54 or higher enclosure when washdown or airborne particulates are present. Dimensions of 105 mm wide by 181 mm tall by 86 mm deep fit the standard SENTRON 3VA mounting footprint, so it drops into existing 3VA panel cutouts and bus-bar arrangements without re-drilling.