What this 4-pole switch disconnector is for
The Siemens SENTRON 3VA1110-1AA42-0AF0 is a 4-pole switch disconnector in MCCB design, rated for 100 A continuous current from 40 °C to 70 °C. It handles 690 V AC and 600 V DC, with busbar connection and front terminals.
Ratings that matter for the install
That -25 °C floor matters for unheated electrical rooms in cold climates; the part will switch reliably without condensation issues down to that point.
Width at 101.6 mm is roughly 4 inches. The switch disconnector has no undervoltage release and no voltage trigger — it's a straight manual isolator with a trip-indicator flag. If you need undervoltage protection or a shunt trip, you'd add an external release module (the optional motor-drive extension is listed as available).