The Siemens SENTRON 3VA1450-1AA42-0HB0 is a 4-pole switch disconnector on the 3VA1 IEC frame 630, rated at 500 A continuous current. It provides visible isolation and safe disconnection of a circuit under load — no overload or short-circuit protection built in, so it pairs with upstream protective devices.
The 500 A continuous rating (In) on the IEC frame 630 means this disconnect handles full-load current for large motor circuits, transformer feeders, or main panel incomers up to that level. Four poles give it the ability to switch three-phase plus neutral, common in 4-wire distribution systems. The shunt trip at 24 V AC/DC allows integration with emergency-stop circuits, fire-alarm panels, or remote PLC-based trip commands — wired to a normally-open contact, it trips the disconnect when voltage is applied.
Deployment context
Mounts in a standard panel enclosure on a mounting plate or DIN-rail adapter (the 3VA1 frame uses a bolt-on footprint). The nut keeper kit on both ends simplifies box-terminal wiring for the main current circuit — no loose hardware to drop into live gear. The shunt trip and auxiliary switch connections land on the front terminals, accessible with the panel door open.