The Siemens 3VA2580-5HN42-0KC0 is a 4-pole IEC frame 1000 circuit breaker with a 55 kA interrupting capacity at 415 V (breaking capacity class M) — built for the pit and the mill, where fault currents hit hard and fast. It carries an ETU350 LSI trip unit, rated at 800 A continuous, with adjustable overload protection (Ir) from 320 A to 800 A and short-circuit protection (Isd) from 1.5 to 10 × Ir.
What the ratings mean for your panel
The 55 kA Icu at 415 V means this breaker can safely clear a bolted fault up to that level without welding its contacts or venting arc gas into the enclosure — critical for a main or feeder breaker in a high-fault industrial distribution board. The ETU350 is a microprocessor-based trip unit giving you LSI (long-time, short-time, instantaneous) curves, so you can coordinate selectively with downstream breakers. The adjustable N-conductor protection (OFF, 50%, 100%) lets you match the neutral to the phase load on a 4-wire system, common in North American-style mining substations.
Integration notes
Mounts on a standard DIN rail or directly to a backplate — the frame 1000 footprint is common across the 3VA2 family, so gland-plate cutouts and busbar risers transfer from other breakers in the same line. The shunt trip (208–277 V AC / 220–250 V DC) on the left side fires on a control signal; wire it through an E-stop relay or a remote trip pushbutton. Two auxiliary switches are factory-fitted for status feedback to the PLC or SCADA.