The VW3AP1103 is a braking unit option for the Altivar Process ATV900 family, sized for 500 kW drive systems. This is a panel-mounted component for indoor, controlled environments, not a standalone enclosure for wet or dusty floors. It is classified as an electrical accessory for compact drive systems, specifically a braking unit that dissipates regenerative energy from the DC bus during deceleration. Without it, a drive handling overhauling loads (conveyors, centrifuges, hoists) would trip on DC bus overvoltage.
Ordering constraint — not a standalone item
This braking unit cannot be ordered alone. It is only available in combination with a standard enclosure from the ATV900 compact drive system range. If you are sourcing this for a BOM line, verify that the enclosure and drive frame size are already specified — the VW3AP1103 is a line-item add-on, not a standalone retrofit part.
What IP23 means for your installation
IP23 is a common protection level for indoor electrical enclosures. It protects against solid objects over 12 mm (fingers, tools) and against water spray up to 60° from vertical. It does not protect against hose-directed water, immersion, or dust ingress. For a braking unit mounted inside a drive cabinet, IP23 is adequate — the cabinet itself provides the environmental seal. Do not install this unit in a washdown zone or outdoors without an additional enclosure.