What this MCCB carries and where it fits
The Siemens 3VA1110-5EF32-0KC0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A at 40 °C, with a 187 kA breaking capacity at 240 V — that's the spec that tells you it'll handle high-fault bolted faults on a 240 V line without welding its contacts shut. It's a 3-pole unit built for line protection, meaning it guards the feeder or main distribution, not a specific motor branch. The 100 A rating holds steady through 50 °C (still 100 A), then starts a gentle derate: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel runs hot near the top of that range, you lose about 9 % of the ampacity — plan your load accordingly.
Breaking capacity across voltages
This MCCB's interrupting capacity drops as the voltage climbs: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. The 121 kA at 415 V is the figure most panel designers will check for 400 V-class distribution — it's well above typical utility fault levels in most industrial plants, so you get solid selectivity headroom.
Panel fit and dimensions
The 3VA1110-5EF32-0KC0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON distribution panel or a DIN-rail adapter without surprises. The 25 W maximum power loss at full load means you need to account for heat in a sealed enclosure; don't bury it against the back wall without some airflow.
What's inside: auxiliary and release options
Factory-fitted with 2 auxiliary switches (HQ type) and a shunt trip release (STL). No undervoltage release, no ground-fault monitoring, no communication module — this is a straightforward line-protection breaker with remote trip capability and status indication. The shunt trip lets you drop the breaker from a PLC or E-stop circuit, which is handy for emergency-off schemes.