The VW3AP1122 is a braking unit option for the Altivar Process ATV900 drive family, sized for a 315 kW drive in a size 1c compact enclosure. It ships as IP23 with a plinth — the plinth handles bottom cable entry and keeps the IP rating intact. This is an electrical accessory, not a standalone drive; it bolts into the drive system enclosure as a matched assembly.
Sourcing constraint you need to know
The manufacturer lists this part as active — no end-of-life notice on file. But there is a hard ordering rule: it cannot be ordered alone, only in combination with a standard enclosure. That means your BOM line needs the matched enclosure code from the same ATV900 size 1c family; the braking unit doesn't ship as a loose subassembly. If you are retrofitting an existing drive cabinet, verify the enclosure compatibility before committing the PO.
What the IP23 rating means on a braking unit
That's a clean indoor rating — suitable for a switchroom or electrical room where you don't have washdown hoses or outdoor rain. The plinth is the key detail: it raises the bottom entry off the floor and keeps the IP seal intact through the cable gland plate. Without the plinth the IP23 rating would be compromised at the cable entry point.
Drive system integration note
This braking unit is destined for the Altivar Process ATV900 compact drive system — a modular drive architecture where the braking chopper and resistor bank are packaged as a bolt-on section, not a separate cabinet. The 315 kW rating tells you the drive it pairs with: size 1c frame. If you are wiring it in, expect DC bus bars rather than loose cables between the drive and the braking unit; the enclosure is pre-drilled for the bus connection. Watch the DC bus polarity and the resistor thermistor wiring — the braking unit's control circuit expects a PTC input from the external resistor.