The industrial-grade, continuous-wave Toptica TopWave deep-UV laser system provides 300 mW output power at a wavelength of 266 nm with excellent power stability and highest reliability. Its complete UV beam path, including the resonant doubling cavity, is enclosed in a specially sealed compartment. In combination with a fully automated shifter of the doubling crystal it enables a typical lifetime of > 10,000 hours, which is key for the use in any industrial application. Consistent beam quality (M² < 1.3) is provided by an optimized beam shaping setup which is also integrated inside the sealed UV section. To avoid contamination of the exit window in non-cleanroom environments the user can connect his purge line to the provided interface.