What it is and what it does
The Siemens SENTRON 3VA2010-5KP32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed for line protection, meaning it sits at the incoming feed of a distribution panel or as the main disconnect for a branch, not for motor or generator protection. The interrupting ratings are the headline: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V tells you this breaker can handle a high-fault utility feed or a transformer secondary without cascading upstream — it's sized for high-available-fault installations where a standard 65 kA or 100 kA MCCB would need a current-limiting fuse ahead of it.
What the ratings mean for your panel
The 100 A continuous rating is flat from 40 °C to 70 °C — no thermal derating curve to calculate, which simplifies panel heat-rise calculations. The insulation voltage is rated 800 V, so the breaker can be used in 480 V and 600 V class systems with margin. The 3-pole configuration handles three-phase feeds. The unit includes a trip indicator and comes with one auxiliary switch plus one trip alarm switch, so you get a remote status signal without adding a separate accessory module. Communication function is built in, meaning it can report status or be integrated into a monitoring system — useful for a facility that tracks breaker trips or load profiles. Maximum power loss is 13.5 W, which is moderate for a 100 A frame; factor that into your enclosure ventilation if you're stacking several breakers.
Physical fit and mounting
The breaker measures 181 mm high, 105 mm wide, and 86 mm deep. That 86 mm depth is the dimension that matters for enclosure depth — it fits a standard 200 mm deep panel with room for wiring gutters. The 105 mm width is the 3-pole frame width; if you're replacing a different brand's 3-pole MCCB, check that the mounting centers and bus-bar spacing match. The unit is designed for screw-mounting on a backplate or DIN-rail adapter (not included). The operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C — fine for unheated warehouses or outdoor enclosures in moderate climates.