What this 800 A MCCB delivers
The Siemens 3VA2580-6HN32-0AJ0 is a 3-pole SENTRON molded case circuit breaker rated for 800 A continuous current across ambient temperatures from 40 °C to 60 °C, with a slight derating to 767 A at 65 °C and 703 A at 70 °C. Its interrupting capacity reaches 242 kA at 240 V, 187 kA at 415 V, and 74 kA at 690 V — figures that place it in the high-fault-duty class for large industrial feeders and switchboards. The ETU350 electronic trip unit provides adjustable long-time (Ir 0.5–1.0× In, tr 0.5–17 s), short-time (Isd, tsd 0.04–0.4 s), and instantaneous (Ii up to 8000 A) protection curves, giving the commissioning engineer selectivity headroom downstream.
Dimensions are 320 mm height, 210 mm width, 120 mm depth — a standard MCCB footprint for 800 A class. The IP40 front protection suits enclosed panel mounting; no external washdown rating, so keep it inside the cabinet.
What the ETU350 trip unit means for coordination
The ETU350 is a programmable electronic trip unit, not a fixed thermal-magnetic. That means the site electrical engineer can shape the time-current curve — set long-time pickup (Ir) anywhere from 400 A to 800 A, short-time delay up to 0.4 s, and instantaneous pickup up to 8000 A — to achieve selective coordination with downstream breakers. Maximum power loss is 135 W at rated current — a figure the panel designer uses for thermal budgeting inside the enclosure.