Siemens 3VA2225-5HN42-0KA0 — 250 A SENTRON MCCB with ETU350 Trip Unit
The Siemens 3VA2225-5HN42-0KA0 is a SENTRON molded case circuit breaker rated for 250 A continuous current (Iu) across a 4-pole frame, fitted with an ETU350 electronic overcurrent release and a factory-integrated shunt trip (STL). Interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415/440 V, and 79 kA at 500 V — high enough to handle most industrial fault-current scenarios without cascading upstream breakers. The ETU350 release provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves, making this breaker suitable for feeder and main-switch duty in distribution panels.
Current Ratings and Thermal Derating
The 250 A rating holds flat from 40 °C through 50 °C ambient; above that it derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. Maximum power dissipation is 48 W at full load — relevant for enclosure thermal calculations when grouping multiple breakers. Operating temperature range spans -25 °C to +70 °C; storage range extends from -40 °C to +80 °C.
Frame Dimensions and Panel Fit
The breaker measures 181 mm high × 140 mm wide × 86 mm deep — a standard 4-pole MCCB footprint that fits Siemens 3VA switchboard and distribution panel cutouts. Rated insulation voltage is 800 V, so the breaker can be applied in 690 V systems with adequate clearance.