The Siemens SENTRON 3VA1225-6EF42-0HA0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection, with a TM240 thermal-magnetic release that gives a rated current of 250 A at 40 °C — the same rating holds at 45 °C and 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. That flat 250 A through 50 °C is useful when the breaker sits in a warm but not hot panel; above 50 °C you lose roughly 7 A per 5 °C step. The shunt trip release (STL) lets a remote signal or safety circuit trip the breaker independently of the overcurrent mechanism, which is standard for emergency-stop or undervoltage-coordination schemes.
Maximum power loss is 57 W — a figure to consider when calculating enclosure heat rise, especially in sealed stainless-steel boxes where convection is limited.
The 80 °C storage maximum means it can sit in a hot warehouse or shipping container without damage — that limit governs handling, not running.