Switch disconnector for isolation and switching duty
The Siemens 3VA1112-1AA36-0HC0 is a SENTRON 3VA1 IEC frame 160 switch disconnector rated for 125 A continuous current — it isolates and switches loads under load but provides no overload or short-circuit protection, so it pairs with upstream protective devices in a distribution panel. Rated for 690 V AC and 500 V DC, it handles motor feeder isolation, bus coupler duty, or DC load switching in control cabinets where a visible break is required. The shunt trip release (STL) accepts 12–30 V DC or 24 V AC for remote tripping, and the two HQ auxiliary switches provide status feedback to a PLC or indication circuit.
Dimensions and panel fit
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this 3-pole unit fits the standard 3VA1 frame footprint — same depth and width as the 100 A line-protection variant 3VA1010-2ED32-0JA0, so a panel laid out for that breaker accepts this switch disconnector without re-drilling or re-spacing. Front terminals accept clamp-type connections, and the IP40 front protection suits enclosed panel mounting where the front face is behind a door.