What this MCCB is and what it does
The SENTRON 3VM1196-3GE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, meaning it sits at the incoming feed of a distribution panel or machine supply to guard against overloads and short circuits. It carries a maximum current rating of 320 A, so it handles the main feed for a moderate-sized sub-distribution board or a heavy machine group. The TM220 thermal-magnetic release gives a fixed thermal trip curve with magnetic short-circuit pickup — no interchangeable trip units, which simplifies spares planning but locks you into that trip characteristic.
Breaking capacity — what the voltages tell you
Breaking capacity drops as system voltage rises: 76 kA at 240 V, 53 kA at 415 V, 32 kA at 440 V, and 12 kA at 500 V. For a 480 V panel in North America, the 32 kA at 440 V is the closest published figure — expect similar or slightly lower at 480 V. That 12 kA at 500 V is the floor; if your available fault current exceeds it at that voltage, you need a current-limiting upstream device or a higher-rated frame. The 4-pole construction means it switches all three phases plus neutral, with 100% N-conductor protection — the neutral pole is fully rated, not just a switched neutral.
Thermal derating and panel fit
Rated 16 A continuous from 40 °C through 55 °C, then derates to 15 A at 60 °C through 70 °C. That flat 16 A band means you get full rating in most ventilated enclosures; only tight, hot cabinets force the 15 A limit. Dimensions are 70 mm deep, 101.6 mm wide, 130 mm tall — fits standard DIN-rail or panel-mount MCCB footprints. IP40 on the front face keeps dust out of the toggle and label area; the rest of the breaker relies on the enclosure for ingress protection. Power loss maxes at 11 W — negligible for thermal budgeting in a typical panel, but worth noting if you pack multiple breakers in a sealed enclosure.