What the ratings mean for fit
The Siemens SENTRON 3VA2225-7HL32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, sized for line protection in distribution panels. The 330 kA interrupting capacity at 240 V (242 kA at 415/440 V, 187 kA at 500 V) means it safely clears high-fault currents downstream of a transformer or bus — the SCCR headroom lets you coordinate selectivity without cascading upstream breakers. At 690 V the rating drops to 4.5 kA, so verify the available fault current at that voltage level before specifying.
Thermal derating and enclosure integration
The breaker carries its full 250 A rating up to 50 °C ambient; above that it derates linearly to 213 A at 70 °C. In a sealed panel with limited airflow, use the 60 °C column (232 A) for realistic continuous load planning. Maximum power loss is 48 W — account for that heat in the enclosure's thermal budget. Dimensions are 86 mm deep, 105 mm wide, 181 mm tall, fitting standard SENTRON 3VA mounting footprints on a DIN rail or panel-mount adapter.