What this MCCB is and what it carries
The Siemens 3VA2225-5HN42-0HA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 250 A at 40 °C and holds that rating through 50 °C, then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C — so in a warm enclosure you lose about 15% of headroom by 70 °C. The 4-pole construction handles three-phase plus neutral or a fourth pole for dual-feed applications. Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. That 187 kA at 240 V tells you this breaker is sized for high-fault locations — transformer secondaries or large motor control centers where available fault current is well above typical 65 kA or 100 kA MCCB ratings. The steep drop to 4.5 kA at 690 V means it is not intended for 690 V main service; at that voltage the interrupting margin is thin. This variant ships with a shunt trip release (STL) for remote tripping — no undervoltage release, no ground-fault monitoring, no auxiliary switch fitted. The shunt trip lets a safety PLC or emergency-stop circuit open the breaker remotely, which is the usual reason a buyer picks this suffix over the base 3VA2225-5HN42-0AA0.
Integration and panel fit
Dimensions are 181 mm height, 140 mm width, 86 mm depth. The 140 mm width is standard for a 4-pole MCCB in this frame size — it occupies four 35 mm DIN-rail modules worth of panel width. The 86 mm depth means it fits a 200 mm deep enclosure with room for rear-mounted busbars or cable lugs. Maximum power loss is 48 W, so factor that into enclosure thermal calculations if the panel is sealed.