Atlas Copco 2101-S4-115R Electronic Tool Controller

The Atlas Copco 2101-S4-115R Electronic Tool Controller is a Power Focus/Tensor S4 drive unit designed to power Atlas Copco torque tools in automated assembly environments. It accepts 100–120 VAC input and provides up to 200 W of output, enabling consistent torque delivery and repeatable tool performance. The unit is listed as model 2101-S4-115R with an alternate part number 8433-0530-20 and is described in sources as a Tensor S4 Power Focus controller. Physical specs reported by catalog listings place the enclosure at about 2.3 in. (width) × 7.0 in. (height) × 7.8 in. (depth) and a weight of roughly 33 lb 13.6 oz (15.4 kg). This device is part of Atlas Copco’s Power Focus/Tensor tool-control family, intended for use with compatible torque tools in scripted or semi-automated workflows.