What this part is and what it isn't
The Siemens SENTRON 3VA1110-1AA42-0DH0 is a 4-pole switch disconnector in MCCB design, rated 100 A continuous current (Iu) on the 160 A frame. It is not a circuit breaker — there is no overload or short-circuit release inside. The description explicitly states 'without overload protection' and 'without short-circuit protection'. This part is a manually operated isolating switch that makes and breaks load current but does not protect the downstream cable or load from faults. The 2 kA limited short-time withstand rating (1 s and 0.5 s) means it can survive a fault current long enough for an upstream breaker to clear it, but it will not trip itself. The integrated undervoltage release (UVR) is wired for 208-230 V AC 50/60 Hz. If the control voltage drops, the UVR opens the disconnector — a standard safety feature for motor circuits where loss of control power should drop the load. The auxiliary contact block carries 2 auxiliary switches (HQ) plus 1 trip alarm switch (HQ), giving three CO contacts total for status feedback to a PLC or indication panel.
Where it fits in the panel
Mounts on a DIN rail or panel via the 3VA frame footprint. Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm tall. The main circuit connects via busbar connection at the front terminals — typical for a distribution panel where the disconnector feeds a busbar system rather than individual cables. The 4-pole configuration handles three-phase plus neutral, common for TN or TT systems where the neutral must be switched. IP40 on the front means it is protected against tools and wires >1 mm but not against water ingress; keep it inside a closed panel.