What this MCCB is and what it carries
This is a Siemens SENTRON 3VA2110-7MS32-0CC0 molded case circuit breaker in the starter protection version — a 3-pole MCCB rated for 100 A continuous current at 40 °C ambient, with an ETU310M electronic trip unit built in. It's the kind of breaker you'd spec ahead of a motor starter or a group of motor loads on a distribution panel, giving you adjustable overload and short-circuit protection in one chassis.
Breaking capacity — what the numbers mean across voltages
The interrupting ratings here are high enough for most industrial service-entrance or sub-distribution applications. At 240 V it's rated for 330 kA, at 415 V and 440 V it holds at 242 kA, at 500 V it drops to 187 kA, and at 690 V it's still good for 52.5 kA. That's the kind of curve you see on a breaker meant to sit close to a transformer or a large generator — it can clear a bolted fault without the arc flashing upstream.
Thermal derating and ambient limits
The 100 A rating holds all the way to 50 °C ambient — no derating needed in a typical ventilated panel. At 55 °C it's 96 A, at 60 °C it's 94 A, at 65 °C it's 92 A, and at 70 °C it's 90 A. The operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C. The maximum power loss is 75 W, which is worth accounting for in a sealed enclosure with multiple breakers ganged together.
Panel fit and auxiliary configuration
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or direct-mount panel layouts common in North American and European gear. It ships with two auxiliary switches HQ and an undervoltage release (UVR) pre-installed, part number 3VA9608-0BB24. The auxiliary contacts let you wire a status feedback to a PLC or a safety relay without adding a separate block.