SENTRON 3VA1225-5EF32-0HA0 — 250 A MCCB with TM240 release
The Siemens SENTRON 3VA1225-5EF32-0HA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) at 40 °C, with a TM240 thermal-magnetic overcurrent release. Line protection version — no ground-fault monitoring, no undervoltage release, no auxiliary contacts, and no trip indicator. It carries a shunt trip (STL) auxiliary release built in, order code 3VA9688-0BL30 for the integrated trip unit. Interrupting capacity is 187 kA at 240 V AC, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V — these SCCR figures cover most industrial distribution panels up to 690 V line-to-line. Rated insulation voltage Ui is 800 V.
Thermal derating and operating limits
Full 250 A rating holds through 50 °C ambient. Above that, derate linearly: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Latching endurance is rated at 15 000 cycles. Front protection is IP40 — suitable for enclosed panel mounting where the front face is behind a door or cover. Dimensions: 105 mm wide × 158 mm high × 70 mm deep.