Siemens SENTRON 3VA1580-5EF32-0DC0 — 800 A MCCB, Line Protection, Undervoltage Release
Breaking capacity reaches 187 kA at 240 V AC and 121 kA at 415 V, with a rated insulation voltage of 800 V — figures that give headroom for high-fault installations like large motor control centers or transformer secondaries.
Rated uninterrupted current holds at 800 A from 40 °C through 50 °C, then derates to 780 A at 55 °C, 761 A at 60 °C, 741 A at 65 °C, and 722 A at 70 °C — a curve that matters when the breaker lives in a hot switchgear lineup. At 500 V the breaking capacity is 75.6 kA; at 690 V it drops to 52.5 kA, so the breaker suits 400 V class systems with ample margin and remains usable on 690 V industrial networks where fault levels are moderate.
Physical Integration
Maximum power loss of 242.5 W at rated current must be factored into enclosure thermal calculations, especially in sealed or high-ambient cabinets.