The Siemens 3VA1225-5EF42-0CC0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current across a 40 °C to 50 °C ambient range, with a TM240 thermal-magnetic release and an undervoltage release (UVR) integrated. It's a 4-pole unit configured for line protection — meaning it sits on the incoming feeder, not on a motor branch or a downstream subfeed. The 250 A rating holds flat through 50 °C — no derating needed in a typical 40 °C panel ambient — then drops to 243.3 A at 55 °C and 223 A at 70 °C.
The integrated auxiliary contacts (2 auxiliary switches HQ) and the undervoltage release are wired separately — the UVR coil needs its own control voltage to keep the breaker closed. If the control voltage drops, the breaker trips. That's a common scheme for emergency-stop circuits or undervoltage protection on a feeder.