What this breaker carries
The Siemens 3VA2140-7MQ36-0AD0 is a 3VA2 IEC frame 160 circuit breaker with a breaking capacity class C rating of Icu=110kA at 415 V, 3-pole, fitted with an ETU860M electronic trip unit for motor protection. The LSIG protection suite covers overload (Ir=16 A...40 A), short-circuit (Isd=1.2...15x In, Ii=3...15x In), and ground-fault (Ig=0.4...1x In, tg=0.05-0.8 s) — configurable to match the motor's thermal and fault characteristics. It ships with three auxiliary switches (HQ) and clamp connections.
What the 110 kA rating means for your panel
An Icu of 110 kA at 415 V puts this breaker in the high-fault category — it can safely interrupt a short-circuit current up to that level without self-destruction, which is critical for panels fed by large transformers or located close to the utility service entrance. The 3VA2 frame (160 A max) paired with a 40 A rated trip unit means the breaker body itself is oversized for the continuous current, giving thermal headroom and a robust mechanical envelope for the high interrupting duty. Mounts on standard DIN rail or panel-mount; the clamp connections accept copper or aluminum conductors without special lugs.