The Siemens 3VA2580-5HN42-0HH0 is a 4-pole IEC frame 1000 circuit breaker rated 800 A with a breaking capacity class M delivering Icu=55 kA at 415 V. It carries an ETU350 LSI electronic trip unit with overload protection adjustable from 320 A to 800 A, short-circuit protection Isd=1.5...10 x Ir, and instantaneous Ii=12 x In. The N conductor protection is adjustable (OFF, 50%, 100%). A shunt trip left accessory for 24 V AC 50/60 Hz / 24-30 V DC is integrated, and the unit includes a nut keeper kit and provisions for 2 auxiliary switches.
The ETU350 LSI electronic trip provides adjustable long-time (L), short-time (S), and instantaneous (I) protection curves, allowing fine coordination with downstream feeders. The adjustable N conductor protection (OFF, 50%, 100%) suits 4-wire systems where neutral current monitoring is required. The integrated shunt trip left at 24 V AC/DC enables remote tripping from a safety circuit or emergency-stop chain.
The nut keeper kit simplifies busbar connection — no loose hardware to drop into live gear.