What this MCCB carries and where it fits
The Siemens 3VA1110-3EF36-0KC0 is a 3-pole SENTRON molded case circuit breaker rated for 100 A at 40 °C ambient, with a maximum breaking capacity of 75.6 kA at 240 V AC. It's designed for line protection — meaning it sits at the incoming feeder or main distribution point in a panel, not downstream on a motor branch. The 70 mm depth and 76.2 mm width fit standard Siemens 3VA panel cutouts; the 130 mm height clears most enclosure gutters. This variant ships with a shunt trip (STL) release and two HQ auxiliary switches built in. The shunt trip lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or interlocked disconnects. The two auxiliary switches give status feedback (open/closed) to a PLC or indicator lamp without adding external contact blocks.
Breaking capacity across voltages — selectivity planning
Breaking capacity drops as system voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V. For a 480 V panel (common in North America) the 32 kA at 440 V is the closest reference — expect roughly 25–30 kA at 480 V. That's sufficient for most commercial and light industrial services with transformer ratings under 1.5 MVA. For 690 V wind or marine applications the 11.9 kA figure governs; verify your available fault current before committing the BOM line.
Thermal derating and power loss
The breaker holds full 100 A rating up to 50 °C ambient. Above that it derates: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. Maximum power loss is 25 W — negligible for panel thermal calculations but worth noting if the breaker is enclosed in a small, sealed sub-panel with other high-current devices. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.