What it is and what the ratings mean
The Siemens 3VA2010-8HN46-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, carrying a continuous current rating Iu of 100 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing in warm enclosures. The interrupting ratings tell you where this breaker can sit in a fault-current study: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. Those are high-interrupting-capacity figures — it handles the full fault current of a large transformer or a utility feed without needing a current-limiting upstream device. Four poles with adjustable neutral protection (OFF, 50%, 100% of phase rating).
Trip unit and integration
The ETU350 electronic trip unit provides LSIG protection (long-time, short-time, instantaneous, ground-fault) with adjustable curves — the kind of selectivity you need for a main or feeder breaker in a distribution panel. No undervoltage release, no shunt trip, no communication module on this variant; it's a standalone thermal-magnetic replacement with electronic precision. Rated insulation voltage Ui is 800 V, and the front face carries IP40 protection — fine for a closed panel, but not for washdown or outdoor exposure. Dimensions are 181 mm high, 140 mm wide, 86 mm deep, so it fits the standard SENTRON 3VA2 mounting footprint for a 4-pole frame. Maximum power loss is 7.7 W — negligible for thermal budgeting inside a panel, but worth noting if you're packing multiple breakers in a sealed enclosure.