The Siemens SENTRON 3VA2225-5HL42-0HH0 is a 4-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with a breaking capacity of 187 kA at 240 V AC and 121 kA at 415 V AC. The 4-pole design covers three-phase plus neutral protection, which is standard for TN-S or TN-C-S systems where you need to break the neutral on a fault. No undervoltage release is fitted — if the application requires UVR, that needs to be added externally. The line protection design (not motor protection) means the thermal-magnetic curve is tuned for cable and busbar protection, not for motor overload curves.
Sizing and derating for panel builders
At full 250 A load the maximum power loss is 48 W, so the enclosure needs enough ventilation or forced cooling to keep internal ambient below 40 °C if you want to hold the full rating. Above 50 °C the breaker must be derated: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, 213 A at 70 °C. That derating curve is published and repeatable — factor it into your panel thermal budget.