Control device for controlling a circuit breaker

Claim 1

A mechanical control device for controlling a circuit breaker, said device comprising an engagement spring and a disengagement spring together with hydraulic means for transmitting a portion of the energy in the engagement spring to said disengagement spring, the device comprising a part which is moveable relative to a fixed frame, said part comprising a rod connected to an operating member of the circuit breaker and a first cylinder which is closed by a piston having a cylindrical body movably sliding in a sealed manner about a collar which is stationary relative to said frame, the disengagement spring surrounding said first cylinder and bearing firstly against said frame and secondly against a collar fixed to the first cylinder, the engagement spring being placed inside the cylindrical body and bearing firstly against said piston and secondly on a second collar which is fixed relative to said frame, with the inside volumes of the first cylinder and of said cylindrical body being filled with a liquid and being in communication with each other firstly via a piston orifice which is removably closed by a valve, and secondly via a non-return valve allowing liquid to pass only from the cylindrical body towards the first cylinder.