Three-pole construction, line protection version. The interrupting ratings climb steeply at lower voltages: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V — so it handles high-fault-current distribution panels at 240–480 V common in North American and European industrial plants.
Thermal derating matters at panel design
The 250 A rating holds flat up to 50 °C. Above that, it derates: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, 200 A at 70 °C. Maximum power loss is 48 W.
Standard SENTRON 3VA panel footprint — mounts on a mounting plate or into a distribution board. The auxiliary contact block (2 HQ switches) and shunt trip are integrated; no external add-on required for remote tripping. Communication function is onboard (ETU850 supports Modbus or PROFIBUS via the 3VA communication module).