Line protection breaker with serious fault-clearing headroom
The Siemens 3VA1125-5EF32-0KD0 is a 3-pole SENTRON molded case circuit breaker rated 25 A continuous at 40 °C, designed for line protection in commercial and industrial distribution panels. Its standout spec is the interrupting capacity: 187 kA at 240 V AC, stepping down to 121 kA at 415 V, 75.6 kA at 440 V, and still holding 17 kA at 690 V — meaning this breaker can clear a fault at nearly any distribution voltage without cascading upstream. That kind of SCCR headroom is what you spec when the transformer secondary or a large motor bank can dump serious energy into a bolted fault.
Thermal derating and panel integration
The 25 A rating holds flat from 40 °C through 50 °C, then drops only 1 A per 5 °C step to 23 A at 70 °C — a gentle derating curve that buys you layout flexibility inside a warm enclosure. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep; the 3-pole footprint matches the standard SENTRON 3VA mounting pattern, so it drops into an existing panel bus without re-drilling. Rated insulation voltage is 800 V, and the maximum power loss at rated current is 8.5 W — manageable for thermal calculations in a packed cabinet.
Current production — no lifecycle concern
Lifecycle status is marked current. No phase-out notice, no last-time-buy window. The 3VA1 series is Siemens' active MCCB platform, so this order code is factory-supported for new builds and BOM-revision projects alike. Sourced to order through independent distribution; availability and current pricing confirmed at quote time against an RFQ.