The Siemens 3VA1225-4EF32-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated 250 A at 40 °C, with a 3-pole configuration and a TM240 thermal-magnetic release. Its interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that govern selectivity and SCCR headroom in a distribution panel.
The 250 A continuous rating holds across 40 °C to 50 °C without derating; above that it steps down to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. For a panel that runs warm — say a packed enclosure near a drive — the 70 °C figure (223 A) is the real limit, not the catalog 250 A.
The 3-pole footprint matches the standard SENTRON 3VA mounting pattern — it bolts directly onto the mounting plate or into a compatible SENTRON distribution panel. No DIN-rail clip on this frame; it is screw-fixed.
Operating conditions and power loss
The breaker has no communication function, no trip indicator, and no voltage trigger; it is a straight thermal-magnetic device with undervoltage release only.