The Siemens SENTRON 3VA1112-1AA32-0AA0 is a 3-pole switch disconnector in MCCB (moulded-case circuit breaker) design, rated for 125 A continuous current across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. It is built on the IEC frame 160 platform and is intended strictly for isolation and switching duty: it provides no overload protection (no thermal trip) and no short-circuit protection (no magnetic trip). That makes it a straight disconnect for a load circuit where upstream protection is already in place. The main circuit connects via busbar connection at the front terminals — a clean, low-profile fit for panel builds where you want the bus run straight onto the device without extra adapters.
The 3VA1112-1AA32-0AA0 measures 70 mm deep by 76.2 mm wide by 130 mm high. Front IP40 protection is suitable for clean indoor panels. Mechanical service life is 15 000 operating cycles typical.
What it does not do — and why that matters
This switch disconnector has no trip indicator, no undervoltage release, no auxiliary contacts, and no communication function. It is a bare disconnect — you add the accessories as optional extensions.