The Siemens SENTRON 3VA1112-1AA32-0DA0 is a 3-pole switch disconnector in an MCCB-style frame (3VA1 IEC frame 160), rated for a continuous current Iu of 125 A. It is not a circuit breaker — there is no overload or short-circuit protection built in. The part is designed for isolation and switching duty only, carrying a maximum power loss of 38 W at full load. Rated operational voltage reaches 690 V AC (50/60 Hz) and 500 V DC, with a rated insulation voltage Ui of 800 V.
Undervoltage release and switching duty
No auxiliary contacts are fitted; the UVR is the only integrated trip device. The disconnector accepts a motor drive as an optional extension, so remote switching is possible without replacing the base unit.
Panel fit and connections
Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm high — a 3-pole MCCB footprint that fits standard Siemens 3VA panel cutouts and busbar systems. Main circuit connections are busbar-type on the front terminals, which simplifies busbar stacking in a distribution panel but means you need the matching busbar adapters rather than ring-tongue lugs. The 2 kA limited-time rating (1 s and 0.5 s) tells you the short-time withstand capability for coordination studies — this disconnector can pass fault current for up to 1 second at 2 kA without damage, which matters when sizing upstream protection.