The Siemens SENTRON 3VA2110-5MN36-0HL0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. It's designed specifically for motor protection, with built-in phase failure detection and a shunt trip (STL) auxiliary release for remote tripping. Interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — so it handles high-fault scenarios on the low-voltage side of a distribution transformer without cascading upstream. Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — fits standard SENTRON 3VA2 panel cutouts. Max power loss is 10 W, worth factoring into enclosure thermal calculations if you're packing multiple breakers in a small cabinet.
What the ratings mean in practice
The 100 A rating is flat from 40 °C to 70 °C — unusual; most breakers start derating above 40 °C. That means you can mount it in a warm panel (say, next to a drive or transformer) without having to oversize the frame. The motor protection design includes phase failure detection, which catches a lost phase before the motor burns out. The 187 kA interrupting rating at 240 V is high for a 100 A frame — it's sized for installations with large upstream transformers where fault current can exceed 100 kA. At 690 V the rating drops to 3.7 kA, so verify your system voltage against the curve before specifying. Auxiliary switch configuration includes 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch (HQ type) — that's enough status feedback for a PLC to know the breaker is on, tripped, or alarmed without extra add-on modules.