250 A MCCB with 440 kA SCCR — what that means for your panel
The Siemens SENTRON 3VA2225-8HL32-0CL0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) and a 440 kA interrupting capacity at 240 V AC — that SCCR figure drops to 330 kA at 415 V and 440 V, then 242 kA at 500 V, and 50.4 kA at 690 V.
Derating and thermal management
At 55 °C it drops to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A. Maximum power loss is 50.5 W — that heat has to be dissipated through the enclosure walls or forced ventilation.
Auxiliary and trip accessories
That gives you status feedback for PLC or SCADA: one set for breaker open/closed, one for trip condition, and one for electrical alarm. The basic switch is order code 3VA2225-8HL32-0AA0; the integrated auxiliary trip is 3VA9608-0BB24 — useful if you need to order spares or replacement sub-assemblies.