TOPP electric actuator model C40 with double link articulated chain, enclosed in a special casing, complete with support and accessories for top and bottom hinged windows. Functions at 230V~50Hz, or alternatively, at 24V DC. Maximum load applicable 400N. Rapid fastening to the window. Maximum extension 50 cm. Possible electronic adjustment limit switch at 10, 15, 20, 25, 30, 40, 50 cm. by means of a special adjustment knob. Electronic limit switch on closure with absorption of current. Safety mechanism for reduction of traction force in the last 10 cm. Electronic device with acoustic warning to signal erroneous installation to the user. Protection at IP55 on electric devices. On request, available in a version designed for the USA2 synchronization unit, for simultaneous operation of 2 actuators installed on the same window frame. The device is marked with the CE seal.