The IRS100-3-25Z15TS3 robot of the 3 kg class is used for processing, manufacturing and assembling in confined spaces. The device is characterised by a high cyclical movement speed and repeatability. Thanks to its short arm with a length of 25 cm, it has a high reaction speed and can move flexibly and quickly. The internal structure and the arm’s casing have been optimised in order to improve the stability and anti-interference capability for internal components.