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. Its interrupting capacity reaches 187 kA at 240 V AC and 121 kA at 415 V AC — figures that tell you this breaker is sized for high-fault-current industrial distribution, not a light commercial panelboard. The 800 V rated insulation voltage and the 70 °C maximum operating ambient confirm it's built for the heat inside a crowded motor control center.
Ratings that decide fit
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.
Breaking capacity across voltages
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. The 17 kA at 690 V is enough for most 600 V class industrial systems, but verify against your transformer's fault-current study.
Physical fit and auxiliaries
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm tall (–). That 3-inch width per pole is the standard SENTRON 3VA footprint — it drops into the same panel cutout as other 3VA frame sizes. It ships with 2 auxiliary switches plus 1 trip alarm switch (HQ) factory-installed, so you get remote status indication without ordering a separate accessory kit.