What this 100 A MCCB actually delivers
The Siemens 3VA2010-5JQ32-0AE0 is a 3-pole SENTRON molded case circuit breaker rated for line protection, with a continuous current of 100 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The interrupting capacity tells the real story: 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. For a 100 A frame, those numbers mean it can sit upstream of a transformer or a feeder panel and still clear a bolted fault without the arc flash climbing upstream. The initial setting starts at 20 A and the full-scale value is 100 A, so it's adjustable within that band — useful when you're protecting a variable load and want to dial in coordination without swapping the breaker. This breaker carries a communication function, which means it can report status or trip events back to a controller — useful for a maintenance team that wants to know why a line dropped without walking the panel. The ground-fault monitoring uses summation current formation on the L-conductor, so it's watching for leakage to ground rather than just phase imbalance. No undervoltage release and no voltage trigger on this variant; if you need those, you're looking at a different order code. The auxiliary switch configuration is 4 HQ switches, which gives you four independent signal contacts for remote indication or interlocking.
Panel fit and integration
The 3VA2010-5JQ32-0AE0 measures 86 mm deep, 105 mm wide, and 181 mm high. Those dimensions are for the breaker body itself; you'll need to account for the handle throw and any auxiliary wiring space. It mounts on a standard DIN rail or can be screw-mounted in a panel enclosure — the SENTRON family uses the same footprint as other 3VA frame sizes, so if you're swapping into an existing panel that was laid out for a 3VA1110, check the depth clearance: the 86 mm depth is consistent with the 3VA1 series, so it should drop in without rewiring the bus bars, provided the mounting holes align. The operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C, so it's fine for unheated electrical rooms or outdoor enclosures in moderate climates.
What the interrupting ratings mean for coordination
At 240 V, the 187 kA interrupting rating is high enough to be used as a main breaker in most low-voltage switchboards without worrying about series ratings. At 415 V and 440 V, the 121 kA still covers the vast majority of industrial fault-current scenarios. The drop to 75.6 kA at 500 V and 3 kA at 690 V is typical for a 100 A frame — at 690 V you're limited to relatively low-fault systems. The power loss is 13.5 W maximum, which matters for thermal management inside a sealed enclosure; if you're packing several breakers in a small box, that heat adds up.