Siemens 3VA6225-5HN31-0AA0 Molded Case Circuit Breaker

Siemens 3VA6225-5HN31-0AA0 is a three-pole molded‑case circuit breaker (MCCB) in Siemens’ 3VA UL Molded Case family, built on the UL Frame 250 platform. It provides line protection for 3‑phase feeders and distribution circuits with a 35 kA interrupting capacity at 480 V and a rated current of 250 A. This device uses an electronic ETU350 trip unit with LSI protection (Long-Time, Short-Time, and Instantaneous) to coordinate fault clearing and safeguard connected equipment. Its nominal current rating is In = 250 A, with a short-circuit pickup Ir adjustable in the 100–250 A range, and short-circuit protection Isd = 1.5–10 × Ir and instantaneous pickup Ii = 10 × In. The combination of the 3VA6 UL frame compatibility and electronic trip technology makes it suitable for protecting industrial feeders and 3‑phase loads in commercial and industrial electrical systems.