The Siemens SENTRON 3VA2010-5HN36-0AJ0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at 40 °C through 70 °C, with no derating across that ambient span — a clean 100 A at every temperature point the datasheet lists. Breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — the 690 V figure is the one to watch if your system runs at that level; it drops sharply from the 500 V rating. Design is line protection, meaning it's intended for feeder and main breaker duty rather than motor branch-circuit protection (which would require a different trip curve or a motor-protective breaker).
Physical footprint: 86 mm depth, 105 mm width, 181 mm height.
Auxiliary and alarm switching
The auxiliary switches signal the open/closed position of the breaker; the trip alarm switch indicates that the breaker has tripped on fault, not just been manually opened.
The base switch part number is 3VA20105HN360AA0 — the -0AJ0 suffix denotes the specific auxiliary switch and trip alarm configuration. If your BOM calls for the exact -0AJ0 variant, the auxiliary switch complement is the distinguishing feature.