The Siemens SENTRON 3VA1110-5EF32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated 100 A continuous at 40 °C, with a TM240 thermal-magnetic trip unit for line protection.
The 100 A rating holds flat from 40 °C to 50 °C, then derates to 98 A at 55 °C and 91 A at 70 °C (–). That derating curve matters when the breaker sits next to transformers or drives that push the enclosure ambient up. The TM240 release is thermal-magnetic — thermal for overload, magnetic for short-circuit — and the breaker carries a trip indicator so a maintenance crew can spot a tripped unit without opening the door.
The interrupting ratings step down with system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V (–). On a 480 V distribution board the relevant figure is the 440 V or 500 V rating — whichever is closer to your actual line-to-line voltage.
Physical fit and auxiliaries
That 3-inch width per pole is the standard SENTRON 3VA footprint — it drops into the same panel cutout as other 3VA frame sizes.