What this MCCB is and what it does
The Siemens SENTRON 3VA2110-5JQ32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, meaning it's the primary overcurrent protective device on a feeder or main in a distribution panel. It carries a continuous 100 A rating flat across the full ambient range from 40 °C to 70 °C — no derating needed up to that upper limit, which simplifies panel layout in warm enclosures. The interrupting capacity hits 187 kA at 240 V and still delivers 121 kA at 415 V and 440 V, so it clears high-fault scenarios on industrial 480Y/277 V or 400 V systems without cascading upstream. At 690 V the rating drops to 3.7 kA, which is still adequate for most 690 V motor circuits with limited fault current. The 3VA2110-5JQ32-0AF0 includes a communication function for integration into a higher-level monitoring or control system, and it ships with 1 auxiliary switch plus 1 trip alarm switch (HQ design) for remote status feedback. Ground-fault monitoring is implemented via summation current formation on the L-conductor, which picks up residual current without needing a separate core-balance transformer on the line side.
Dimensions and panel fit
The breaker measures 105 mm wide × 181 mm high × 86 mm deep. The 105 mm width is standard for a 3-pole SENTRON 3VA frame at this rating, so it fits the same DIN-rail or mounting-plate footprint as other breakers in the series. The 86 mm depth leaves clearance for rear-mounted busbars or cable ladders behind the panel door.