Siemens SENTRON 3VA1110-6EF32-0CC0 — 100 A MCCB with TM240 Release and Undervoltage Protection
It carries a TM240 thermal-magnetic overcurrent release, meaning the thermal element is calibrated for a 240 A frame but the breaker is shipped with a 100 A rating plug — the trip unit is field-adjustable within that frame's range. The interrupting capacity is substantial: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream.
Thermal Derating and Ambient Temperature Performance
Above that, derating is gradual: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. This is a clean thermal curve — no cliff at 40 °C, so it works in a warm enclosure without oversizing the frame.
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits Siemens SENTRON mounting plates and most DIN-rail adapters. The breaker has no trip indicator and no voltage trigger, but the UVR coil provides its own status via the auxiliary switches.