SELF-LOCKING ELECTROMECHANICAL OPERATOR WITH A 24 Vac motor and a separate electronic programmer. The gate position is encoder controlled and self-programming thus reducing installation times to a minimum and optimising the programming procedure. The operator arm, built around a robust structure in cast aluminium, features an efficient motor that works in complete synergy with a high performance reduction unit that is isolated inside a waterproof compartment and is lubricated using permanently fluid grease. The special, well thought out, three piece carter, the rotating screw supported by double bearings and the special drag screw make it a top of the range operator with a unique performance level. Adjustment brackets in zinc-plated steel. Key operated release system.