The Siemens SENTRON 3VA2225-7KP32-0HA0 is a 3-pole molded case circuit breaker rated 250 A continuous (Iu) across 40 °C to 50 °C, with the ETU850 electronic overcurrent release handling line protection. It delivers 330 kA breaking capacity at 240 V — that SCCR headroom means it can sit upstream in a high-fault distribution panel without cascading failure through downstream gear. At 415 V and 440 V it still holds 242 kA, and drops to 187 kA at 500 V; at 690 V the rating is 4.5 kA, so verify coordination if the secondary side runs that voltage.
Integration and mounting
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — standard SENTRON 3VA footprint for a 250 A frame. Mounts on a DIN rail or direct panel; IP40 on the front means it tolerates tool-dust and incidental touch in an enclosed cabinet but not washdown. The ETU850 release includes communication function (PROFIBUS/PROFINET-ready via the 3VA COM module), so it can report trip events and load current back to a PLC — useful for predictive maintenance on a CNC line or conveyor system.
Thermal derating and power loss
Rated 250 A from 40 °C to 50 °C; above that it derates linearly to 200 A at 70 °C. Maximum power loss is 48 W — that heat must be considered in panel thermal calculations, especially if the breaker is enclosed with other high-current devices. Ambient operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.