What the interrupting ratings mean for your panel
The Siemens SENTRON 3VA2580-5JP32-0BA0 is a 3-pole molded case circuit breaker rated for 800 A continuous current (Iu) at 40 °C through 60 °C, derating to 767 A at 65 °C and 703 A at 70 °C. Its interrupting capacity is the headline figure: 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — these are the fault currents it can safely clear without welding contacts or rupturing the case. For a 415 V distribution board, that 121 kA SCCR means it sits comfortably downstream of a transformer with high fault potential; you do not need a current-limiting fuse upstream to protect the breaker itself. The ETU550 electronic trip unit gives adjustable long-time pickup (Ir) up to 800 A, long-time delay (tr) from 0.5 to 25 seconds, and short-time delay (tsd) from 0.05 to 0.5 seconds. That lets you coordinate selectively with downstream breakers — set the short-time delay long enough that a branch fault clears before this main breaker sees it. The 10 000-cycle latching endurance covers routine switching of the load side for isolation, not daily motor starting.
Panel fit and dimensions
The breaker measures 210 mm wide, 320 mm high, and 120 mm deep — a standard SENTRON 3VA frame size for the 800 A class. It mounts with four screws to a backplate or mounting bracket; no DIN-rail clip on this frame. IP40 on the front means the breaker face is protected against tools and wires >1 mm, but the enclosure around it must handle the rest. The 135 W maximum power loss at full load needs ventilation clearance in the cabinet — do not bury it against a solid panel without airflow.