Robust, horizontally sliding, electrically operated sliding window which is suitable for either indoor or outdoor installation. The sliding window has a frame made in either steel or stainless steel. The SH model is specially designed for installations in which strict demands are made on protection against assault or firearm attack. The SH model can be equipped with everything between 6 mm laminated glass up to 75 mm thick bullet-resistant glass. The sliding window is automatically locked. The sliding window is controlled by means of a manoeuvre box or foot switch.