What it is and where it lands
The Siemens 3VA2010-6HN36-0AB0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current (Iu) across a 3-pole configuration, fitted with the ETU350 electronic trip unit for line protection. It carries a rated insulation voltage of 800 V and delivers interrupting capacity of 242 kA at 240 V, 187 kA at 415 V, and 4 kA at 690 V — meaning it can clear fault currents up to those levels without cascading upstream, a key selectivity number for panel coordination. This MCCB is designed for DIN-rail or panel-mount installation inside an enclosure, with an IP40 rating on the front — meaning the front face is protected against solid objects over 1 mm, but the body relies on the enclosure for washdown or outdoor duty. It measures 105 mm wide, 181 mm high, and 86 mm deep, so it fits standard MCCB panel cutouts without surprises.
Rated current and thermal derating — the real selection number
The 100 A continuous rating holds flat from 40 °C up to 50 °C ambient — no derating needed in a typical 40 °C panel. At 55 °C it drops to 96.25 A, at 60 °C to 92.5 A, at 65 °C to 88.75 A, and at 70 °C to 85 A. If your panel runs hot (say near a drive bank or transformer), size the load to the derated figure, not the nameplate 100 A. The maximum power loss is 13.5 W — negligible for most enclosures but worth checking if you're packing breakers tight.
Trip unit and auxiliary contacts
The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves — it is the standard electronic trip for this 3VA frame size, giving better selectivity than a thermal-magnetic unit on long feeder runs. The breaker ships with 2 auxiliary switches (HP type) pre-installed, so you get status feedback without adding a separate accessory. It does not include undervoltage release, communication module, or ground-fault monitoring — those are separate options if your spec requires them.