What this 800 A MCCB brings to the panel
The Siemens 3VA2580-6HN32-0KH0 is a SENTRON molded case circuit breaker rated for 800 A continuous current across the full 40 °C to 60 °C ambient range, only beginning to derate at 65 °C (767 A) and 70 °C (703 A). That thermal stability means it holds its full rating in a warm enclosure without oversizing the frame. Breaking capacity is 242 kA at 240 V, 187 kA at 415 V, and 74 kA at 690 V — figures that put it in the high-interrupting category for large industrial services or transformer secondaries. The ETU350 electronic trip unit gives adjustable long-time (Ir 0.5–1× In, tr 0.5–17 s), short-time (Isd, tsd 0.04–0.4 s), and instantaneous (Ii up to 8000 A) protection curves, letting you coordinate downstream feeders. Front IP40, storage from -40 °C to 80 °C, operating -25 °C to 70 °C. Dimensions 320 mm high × 210 mm wide × 120 mm deep, which is a standard SENTRON 3VA frame footprint for this amp class.
Coordination and selectivity note
The ETU350's adjustable short-time delay (0.04–0.4 s) enables zone-selective interlocking with downstream breakers — useful for minimizing outage area on a fault.