The SENTRON 3VA1112-1AA36-0AG0 is a 3-pole switch disconnector in a molded-case circuit breaker (MCCB) form factor, rated 125 A continuous across the full operating temperature range from 40 °C to 70 °C with no derating. It operates at 690 V AC or 500 V DC, making it suitable for line-side isolation in 400 V and 690 V industrial networks.
What the ratings mean for fit
The 125 A rating holds flat from 40 °C to 70 °C — no thermal derating curve to calculate. That simplifies panel sizing: if your load is 125 A or less at any ambient up to 70 °C, this switch disconnector handles it without a temperature correction factor. The 690 V AC rating covers both standard 400 V distribution and 690 V motor circuits common in heavy industrial and mining installations. This is a switch disconnector only — no overload or short-circuit protection (SD100 designation). It provides visible isolation for safe maintenance but requires upstream overcurrent protection. The 3-pole front-terminal design accepts cable connections directly, and the IP40 front protection suits enclosed panel mounting where the front face is the only exposed surface.
Integration and deployment
The 76.2 mm width and 70 mm depth match the standard 3VA frame 160 footprint — drops into the same DIN-rail or panel-mount cutout as other 3VA1112 variants. The front-terminal connection keeps wiring accessible without removing the unit from the panel. An integrated auxiliary switch and trip alarm switch (HP type) provide status feedback to a PLC or indication lamp without requiring an external accessory block.