The Siemens SENTRON 3VA1112-1AA36-0AA0 is a 3-pole switch disconnector in an MCCB-style housing, rated 125 A continuously from 40 °C through 70 °C with no derating over that span. It is designed for the IEC frame 160 platform and carries no overload or short-circuit protection — it is a pure disconnect, not a circuit breaker. Front terminal connections (clamp type) simplify bus-bar and cable landing in a panel. The 70 mm depth, 76.2 mm width, and 130 mm height fit standard DIN-rail enclosures; check your gland-plate clearance against the 70 mm projection, especially in shallow backboxes.
That is unusual for a disconnect in this frame size; most parts lose 10–20 % above 50 °C. The 15 000 mechanical operating cycles typical is a service-life figure for the disconnect mechanism — not a short-circuit endurance rating (this unit has no short-circuit protection).
Deployment context
The front terminal arrangement keeps wiring accessible for panel builders. No auxiliary contacts or releases are fitted; if you need remote status or undervoltage tripping, you will add external components. The optional motor-drive extension (not included) allows remote switching.