The Siemens 3VA1340-1AA32-0AH0 is a 3-pole switch disconnector from the 3VA1 series, rated at 400 A continuous current on an IEC frame 400. It is a SD100 variant — a disconnect switch without integral overload or short-circuit protection, intended for isolation and switching duty where the upstream protection device handles fault clearing.
The 400 A rating (In) is the continuous current the switch can carry without exceeding its temperature rise limits. Because this is a switch disconnector without overload protection, it must be paired with an upstream circuit breaker or fuse sized to protect the downstream cable and load. The two auxiliary changeover contacts (type H) and one trip alarm switch changeover provide remote status feedback. The auxiliary contacts follow the main contact position; the trip alarm signals when the switch has been operated by a shunt trip or undervoltage release (if fitted). These are wired separately from the main power path, typically to a PLC or indicator panel.
Deployment Context
This switch disconnector is designed for panel-mount or DIN-rail installation in industrial control cabinets, serving as a manual disconnect for motor feeder circuits, distribution sub-feeds, or machinery isolation points. The nut keeper kit simplifies bus-bar connection during panel assembly — the captive nuts stay aligned with the bus-bar holes, reducing installation time on multi-pole builds.