The VW3AP1111 is a braking unit accessory for the Altivar Process ATV900 drive family, rated for 160 kW systems in size 1c. It carries IP54 protection with a plinth, meaning it's sealed against dust ingress and water splashes — suited for installation in washdown or outdoor-adjacent enclosures where the drive system needs to shed braking energy into a resistor bank.
What the IP54 rating means on a braking unit
IP54 on a braking unit is not common — most braking resistors and chopper modules are open-frame or IP20. The IP54 rating with plinth means this unit is designed for floor-standing or wall-mounted enclosures in environments where dust and water spray are present, such as food-processing lines or outdoor pump stations. The plinth provides a stable base for cable entry and keeps the braking transistor and control electronics protected from condensation that can form during thermal cycling in cold storage or humid ambients.