The Siemens SENTRON 3VA4130-6ED34-1AA0 is a 3-pole molded-case circuit breaker rated 30 A continuous at 40 °C, with a TM210 thermal-magnetic release set for LI (long-time and instantaneous) protection. The instantaneous pickup is fixed at 300 A — no adjustment range, so it trips fast on a hard fault. At 65 kA at 480 V, this breaker can sit at the main lug of a panel fed from a 500 kVA transformer without worrying about cascading failure. The 100 kA at 240 V covers the worst-case bolted fault on a 208Y/120 V secondary — common in North American commercial and industrial switchboards.
At 55 °C it derates to 29 A, at 65 °C to 28 A, and at 70 °C to 27 A. That flat curve means you can pack it into a warm enclosure — say a non-ventilated panel near a drive or transformer — and still count on nearly full rating. The 76.2 mm width (3 in) and 75.1 mm depth (3 in) fit standard MCCB mounting footprints; the 129.4 mm height (5.1 in) clears most distribution panel gutters.