What this MCCB carries — and what it protects
The Siemens SENTRON 3VA2110-7MN32-0AG0 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 curve to chase up to that ceiling. Designed specifically for motor protection (Product Designation: Motor protection), it includes phase failure detection as a built-in function, so a single dropped phase trips the breaker before the motor cooks. Interrupting capacity hits 330 kA at 240 V, dropping to 242 kA at 415/440 V, 187 kA at 500 V, and 3.7 kA at 690 V — the 690 V figure is the ceiling for this frame; above that, the arc extinction limits out.
Panel fit and mounting
Footprint: 105 mm wide × 181 mm tall × 86 mm deep. Verify gland-plate clearance for the 86 mm depth (3.39 in) before laying out the backplane. Ships with one auxiliary switch and one trip alarm switch (HP type) factory-fitted — no add-on module to order separately for status feedback.
What the ratings mean for a motor circuit
The 100 A frame is the continuous rating. The thermal-magnetic trip curve coordinates with contactor and overload relay downstream. Phase failure detection means a single open phase on the supply side trips the breaker — no separate phase-monitor relay needed in the panel. That saves a DIN-rail slot and a control-wire pair. Maximum power loss is 10 W — negligible for thermal budget inside a ventilated enclosure, but worth noting if the panel is sealed and densely populated.