Motovario, solution for the high voltage disconnectors

23 April 2012


The high voltage disconnector is a device for the safety of a plant or an electrical circuit. It has the task of opening a circuit or a line, so physically and visibly perceptible, separating two points electrically connected to each other so there is no more metallic continuity between them. A disconnector can be associated to a switch, but this one has a limit in terms of maximum current opening.

The disconnector task is to safely disconnect the voltage from the plant, in order to enable people to access the system itself for performing work, involving contact with live parts or any activity close to the plant. The disconnector can be differentiated regarding the movement of the arm but also for what concerns the type of the disconnecting system.

Independently from break disconnector type, the mechanism box, positioned beneath each break disconnector, contains the geared motor for the handling of machine moving parts and the control panels. The output shaft of the gearbox comes out from the mechanism box for the break disconnector handling.


Motovario offers a range of product that can be selected according to the design and the type of the disconnector, which best suits on the application. The reducer selected is a worm gear reducer, NRV design, with some special design developed for this kind of drive:

  • Worm shaft of the gearbox by Motovario drawing
  • Oil seal with grater internal diameter
  • Manual movement of the reducer constraining a special crank gear to the hollow protrusion of the worm shaft
For this application usually is used a 4 poles electric motos, but solutions are possible event with 6 and 8 poles motors in a power range between 0,22 and 0,55 kW


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