The Siemens 3VA1112-6EE32-0AA0-ZD00 is a 3-pole IEC frame 160 MCCB in breaking capacity class H, meaning it can interrupt 70 kA at 415 VAC — enough headroom for high-fault utility feeds or transformer secondaries without cascading upstream. The TM220 thermal-magnetic trip unit gives you an adjustable overload band from 88 A to 125 A (Ir) and a fixed short-circuit pickup at 10 x In (Ii = 1250 A). That 10x multiplier is standard for motor-circuit coordination; it rides through normal inrush but clears a bolted fault fast. The ATFM designation confirms the magnetic trip is fixed, not adjustable, so what you see on the nameplate is what you get for instantaneous protection.
What the 70 kA Icu means for selectivity
The 70 kA Icu at 415 V puts this breaker in the high-fault tier of the 3VA1 family — class H. For comparison, the standard class N version of the same frame carries 36 kA at 415 V. The trade-off is a slightly higher let-through energy (I²t) on low-level faults, but for most industrial switchboards the 70 kA rating is the safer call.
Frame 160 means the breaker footprint matches the standard 3VA1 cutout — 105 mm wide per pole, so three poles occupy about 315 mm on the DIN rail or mounting plate. The nut keeper kit retains the line-side lug hardware; torque the main connections to the Siemens-recommended value (typically 35–40 Nm for this frame, verify on the nameplate).