The Siemens 3VA2025-8KP46-0AA0 is a SENTRON molded case circuit breaker sized for line protection duty. It carries a 25 A continuous current rating across the full ambient range from -25 °C to 70 °C, so no derating curve to chase for standard panel environments. The 4-pole construction handles three-phase plus neutral, common for North American and European distribution panels where a switched neutral is required. The ETU850 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — that's a step up from fixed thermal-magnetic breakers when you need selectivity coordination downstream. Communication function and other measurement functions are built in, meaning this breaker can report status and load data back to a BMS or PLC without an add-on module.
Short-circuit ratings that matter for panel coordination
Short-circuit breaking capacity is 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. That 440 kA figure at 240 V covers high-fault utility feeds common in industrial services; the 52.5 kA at 690 V still clears most motor-circuit faults without upstream fuses. Insulation voltage is rated 800 V, so the breaker is comfortable in 480/277 V or 600 V delta systems.
Panel fit and mounting
Dimensions are 181 mm high, 140 mm wide, 86 mm deep. The 140 mm width is the standard 4-pole MCCB footprint for the 3VA2 frame — it occupies the same panel cutout as other 4-pole SENTRON breakers in this series. IP40 on the front means it is protected against solid objects over 1 mm; suitable for enclosed distribution boards, not for washdown environments.