The Siemens SENTRON 3VA1110-4FD42-0AA0 is a 4-pole molded case circuit breaker rated for 100 A continuous current at 40 °C, with a TM210 thermal-magnetic release for line protection. Its breaking capacity reaches 121 kA at 240 V AC, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — numbers that matter for fault-current coordination studies on the distribution side of a transformer.
The breaker holds its full 100 A rating up to 50 °C ambient; above that it derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. Maximum power loss is 25 W. In a crowded panel, that thermal curve tells you whether you need to leave a slot open or shift the breaker to a cooler zone.
The 3VA1110-4FD42-0AA0 measures 70 mm deep, 101.6 mm wide, and 130 mm high. Front face is IP40 rated. It accepts an optional motor drive for remote trip or reset. The 4-pole width (101.6 mm) matches the standard SENTRON 3VA frame footprint — it drops into the same DIN-rail or screw-mount position as other 4-pole 3VA breakers without re-drilling the backplate.