The VW3AE1003 is a resistance braking unit from Schneider Electric, designed for use with the ATV61 and ATV71 series of variable speed drives. Its function is to dissipate regenerative energy from a decelerating motor load as heat, preventing DC bus overvoltage trips and enabling controlled stopping or dynamic braking.
This braking unit is a panel-mounted accessory sized for the ATV61 and ATV71 drive frames. It connects across the DC bus terminals of the drive, typically wired in parallel with the drive's internal braking transistor. The unit itself contains the power resistor and thermal protection; no external contactor is required for its braking circuit.