What this MCCB is and what the ratings mean for your panel
The Siemens SENTRON 3VA2110-7MS32-0KL0 is a 3-pole molded case circuit breaker (MCCB) in the 3VA2 frame, rated 100 A continuous current at 40 °C through 50 °C, with a 330 kA interrupting capacity at 240 V and 242 kA at 415 V. This is a starter protection version — meaning it's built to sit ahead of a motor starter combination, providing both short-circuit and overload protection in one device, rather than a straight feeder breaker. The 330 kA at 240 V tells you it can safely clear a fault up to that level without the arc flashing over or the case rupturing, which matters when the available fault current at the panel is high — common on large transformer secondaries or generator-fed switchgear. The ETU310M electronic trip unit gives you adjustable long-time, short-time, and instantaneous pickup settings, so you can coordinate selectivity downstream without swapping trip packs.
Integration and mounting
Mounts on a DIN rail or directly to a backplate via the 4-hole pattern. Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — fits a standard 3-pole MCCB slot in most panel layouts. The auxiliary contact block is pre-configured as 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch (HQ version), so you get status feedback without adding a separate module. Shunt trip (STL) is built in, no undervoltage release. No communication module or phase-failure detection on this variant — it's a straight protection device.
Derating and thermal performance
Rated 100 A from 40 °C to 50 °C ambient. At 55 °C it derates to 96 A, at 60 °C to 94 A, at 65 °C to 92 A, and at 70 °C to 90 A. If your panel runs hot — say, a non-ventilated enclosure near a furnace line — you need to account for that drop. Maximum power loss is 75 W, which affects enclosure heat rise calculations. Storage range is -40 °C to 80 °C; operating range is -25 °C to 70 °C. Latching endurance is 20,000 operations — a solid mechanical life for a motor-circuit protector.