The Siemens 3VA1110-1AA36-0DC0 is a 3-pole switch disconnector from the SENTRON family, built in an MCCB form factor. It carries a 100 A rated continuous current (Iu) and is rated for 690 V AC / 500 V DC maximum operational voltage.
What the ratings mean for fit
Rated continuous current Iu = 100 A means this disconnector handles full-load current on a 100 A feeder without derating at 40 °C ambient. The 690 V AC rating covers 400/480 V systems with headroom; the 500 V DC rating suits battery banks or DC bus isolation up to that voltage. The undervoltage release (UVR) is wired to a 208-230 V AC supply — if that control voltage drops, the disconnector trips open. This prevents automatic restart after a brownout. The unit also has two HQ auxiliary switches (form C) for status feedback to a PLC or panel lamp. Front terminal connection means the load and line cables land on the front face — common for panel layouts where side-access is tight. The IP40 front protection keeps tools and fingers out but is not rated for washdown; this is a dry indoor panel part. Mechanical endurance is 15,000 operations — enough for daily switching in a distribution board but not for high-cycle process control. The 2 kA short-time withstand (1 s and 0.5 s) confirms it can ride through a fault until an upstream breaker clears.
Panel integration
Mounts on a DIN rail or panel via the MCCB footprint. Dimensions: 130 mm height, 76.2 mm width, 70 mm depth — fits standard SENTRON 3VA1 cutouts. The front terminal connection accepts lug or clamp terminations; the UVR module occupies the auxiliary slot on the right side.