What the ratings mean for fit
The Siemens 3VA2110-7MS36-0DL0 is a SENTRON molded case circuit breaker (MCCB) sized for starter protection duty — meaning it's built to handle motor inrush without nuisance tripping while still clearing a fault. Continuous current is rated 100 A flat across the full operating range of 40 °C to 70 °C, so no derating curve to chase in a warm enclosure. The adjustable thermal-magnetic trip band runs from 300 A minimum to 1 500 A maximum, which covers most medium motor branch circuits and feeder applications. The interrupting ratings are what make this part stand out: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA at 240 V is a high-fault SCCR — it means this breaker can sit on a transformer secondary or a high-capacity bus without needing a current-limiting fuse upstream, as long as the available fault current stays under that number.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard MCCB footprint for a 3-pole 100 A frame. The 105 mm width means it occupies three 35 mm DIN modules worth of panel space, which is typical for this class. It ships with an undervoltage release (UVR) fitted, plus a complement of auxiliary switches: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ. That gives you remote status indication without adding external relays. The supplied basic switch is order code 3VA21107MS360AA0, so if you're replacing just the switching mechanism, that's the sub-assembly to reference. No ground-fault monitoring module is included, so if GF protection is needed, it must be added externally. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 12.5 W — negligible for panel thermal budgeting, but worth noting if the enclosure is densely packed.