The Siemens SENTRON 3VA1112-1AA32-0AB0 is a 3-pole switch disconnector in an MCCB-style housing, rated 125 A continuously across the full 40 °C to 70 °C ambient range — no derating needed up to the enclosure's operating limit. It is designed for load-break isolation without overload or short-circuit protection, making it a pure disconnect for applications where upstream protection is already in place. The front-terminal busbar connection suits panel layouts where the disconnect ties directly into a busbar system rather than individual cable lugs.
Rated insulation voltage is 800 V, with AC operating voltage to 690 V and DC to 500 V, so it covers standard 400/480 VAC three-phase systems and 500 VDC battery or solar strings. Mechanical service life is 15 000 operating cycles typical, which is adequate for a disconnect that sees daily switching but not continuous motor starting.
The switch disconnector occupies a 3-pole MCCB footprint: 76.2 mm wide, 130 mm tall, 70 mm deep. Front terminals accept busbar connections for the main circuit, and the auxiliary switch bay comes populated with 2 CO contacts (HP type). An optional motor drive can be added for remote switching.