Electric actuator TOPP model ACK4 with double-link chain made of STAINLES steel, contained in a die-cast body of aluminium alloy coated by epoxy powders, . Operation at 230V~ 50Hz, as an alternative, at 24V d.c. Max. traction and thrust force 300N. Max> stroke of 400 mm. Electronic stroke-end adjustable every 5 cm. by an external hand-grip. Electronics with acoustic device that warns of any eventual incorrect installations. Electronic stroke end through an external hand-grip on both sides of the actuator body. If required, USA2 synchronization unit available, for the simultaneous running of 2 actuators on the same window. Protection degree of electric devices IP55. CE marked device complying with the following directives: EEC 89/336, EEC 73/23 and following amendments.