What this 100 A MCCB is and what the ratings mean for fit
The Siemens SENTRON 3VA2110-7MN36-0AH0 is a 3-pole molded case circuit breaker in the motor protection version, rated for a continuous current Iu of 100 A. It uses the ETU350M electronic overcurrent release with phase-failure detection built in. The continuous current holds at 100 A from 40 °C up to 50 °C ambient, then derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel runs hot — say a sealed enclosure with drives — that 90 A at 70 °C is the number to size against, not the 100 A. The maximum power loss is 75 W, so factor that into the enclosure thermal budget. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ version), which is enough to signal the breaker state to a PLC or annunciator panel without adding a separate aux block.
Integration and panel fit — dimensions and mounting
The 3VA2110-7MN36-0AH0 measures 105 mm wide, 181 mm high, and 86 mm deep. The width of 105 mm is standard for a 3-pole 100 A frame in the SENTRON 3VA line.