What it is and what it does
The Siemens 3VA2110-7MN32-0KC0 is a SENTRON molded case circuit breaker (MCCB) built specifically for motor protection — it's the dedicated branch-circuit device for a motor starter, not a general-purpose feeder breaker. Rated 100 A continuously at 40 °C (and flat to 70 °C, so no derating headache in a warm panel), it carries a 3-pole design with phase failure detection built in. That means if one phase drops on the line side, the breaker trips — no separate phase-loss relay needed.
Breaking capacity — what the numbers mean for your fault duty
This MCCB's interrupting rating is 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V tells you this is a 600 V-class frame — fine for 480 V or 600 V systems, but not the right choice for a 690 V motor circuit unless the available fault current is under 3.7 kA. For a typical 480 V panel with a 65 kA SCCR requirement, the 242 kA at 440 V gives plenty of headroom for series-rated coordination with a downstream contactor.
Integrated accessories — shunt trip and auxiliary switches
Factory-fitted with a shunt trip release (STL) and two HQ auxiliary switches. The shunt trip lets a remote E-stop or PLC output open the breaker without a manual handle pull — common in safety circuits or emergency-off chains. The two auxiliary switches give status feedback (open/closed) to a PLC or indicator lamp. No undervoltage release on this variant, so if you need UVR for a machine-start interlock, this isn't the order code.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. Standard MCCB footprint for a 100 A frame — mounts on a DIN rail or directly to a backplate with the supplied hardware. The 86 mm depth leaves room for wiring gutters in a 200 mm deep enclosure.