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
Rated insulation voltage (Ui) is 800 V, giving headroom for 690 V AC systems without creeping into the margin. Maximum power loss at rated current is 38 W — relevant if you're packing multiple units in a sealed enclosure and need to budget heat rise. The auxiliary contact configuration ships as 1 auxiliary switch plus 1 trip alarm switch (HQ type), which gives you both a position-feedback signal and a separate fault indication without adding an external module. Protection on the front face is IP40 — tool-proof, not hose-proof, so it belongs inside a panel, not on a washdown station. The operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. That -25 °C floor matters for unheated electrical rooms in cold climates; the part will switch reliably without condensation issues down to that point.
Panel fit and wiring notes
Dimensions: 130 mm high, 101.6 mm wide, 70 mm deep. The 70 mm depth clears most standard enclosures with room for wiring gutters. 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). The 2 CO contacts on the auxiliary give you two form-C changeovers for status feedback to a PLC or indicator lamps.