Siemens 3VA1112-1AA42-0AC0 is a SENTRON switch disconnector in MCCB design — 4-pole, rated 125 A continuous across 40 °C to 70 °C without derating. This is a pure disconnect — no overload protection, no short-circuit protection. The description flags it as SD100 (switch disconnector), so it's intended for isolation and switching under load where upstream protection (a fuse or MCCB) handles the fault clearing. Mechanical service life is 15,000 operating cycles typical.
Front IP40 protection on the front. The auxiliary switch block is integrated as 2 HQ switches — these are high-rupturing-capacity microswitches suitable for direct switching of PLC inputs without an interposing relay in most cases. Motor drive is listed as an optional extension.
Maximum power loss is 38 W. That's the heat to account for in the enclosure thermal calculation.