The Siemens SENTRON 3VA2225-5HN32-0KK0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 250 A at 40 °C and a rated insulation voltage of 800 V. Its breaking capacity hits 187 kA at 240 V and 121 kA at 415 V — figures that give real selectivity headroom in high-fault panels. The ETU350 electronic trip unit handles the overcurrent release, and the shunt trip (STL) is integrated for remote tripping.
Breaking capacity and thermal derating
At 690 V the breaking capacity drops to 4.5 kA — a steep fall that matters if your panel feeds a 690 V bus. The rated current holds flat at 250 A up to 50 °C, then derates to 212.5 A at 70 °C. That 70 °C operating maximum is the absolute limit; the storage range spans -40 °C to 80 °C.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, 107 mm deep. Front protection is IP40 — suitable for enclosed panel mounting, not for washdown or outdoor exposure. The latching endurance is rated at 20,000 operations, which is typical for a distribution MCCB in a switchboard. No communication function, no phase failure detection, no undervoltage release — this is a straightforward line-protection breaker with a shunt trip for remote opening.