The Siemens 3VA1225-5EF32-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection — a 3-pole, 250 A frame with a TM240 thermal-magnetic overcurrent release. That TM240 designation means the thermal trip is fixed at 240 A, so this breaker protects a feeder or large load up to that continuous current, with magnetic instantaneous pickup for short-circuit events. The 250 A rating at 40 °C is the baseline; it derates to 223 A at 70 °C, so if your panel ambient runs hot, size accordingly. Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. For a 480 V panel, the 75.6 kA at 440 V figure is the one that governs SCCR compliance; verify your available fault current against that value.
Dimensions: 105 mm wide, 158 mm high, 70 mm deep.