The VW3AP1112 is a braking unit option for the Altivar Process ATV900 drive family, rated for 315 kW in size 1c. It carries IP54 protection with a plinth, meaning the enclosure seals against dust and water spray — suitable for floor-mount cabinets in washdown or dusty environments. This is an electrical accessory, not a standalone drive; it dissipates regenerative energy from the DC bus during deceleration, keeping the drive from tripping on overvoltage when stopping high-inertia loads like centrifuges, conveyors, or fans.
IP54 with plinth means this unit is designed for floor-standing or wall-mounted enclosures with gland-plate entry — not a DIN-rail snap-on. The braking resistor connects externally; verify the resistor's thermal rating matches the duty cycle of your application (repeated fast stops on a conveyor will demand a higher wattage resistor than occasional deceleration). The braking unit shares the drive's DC bus, so cable length between the drive and braking unit should be kept under the drive manual's recommended maximum to avoid reflected-wave stress on the IGBTs.