Pole actuation booster mechanism

A pole actuation booster mechanism, adapted to operate on a pole of a four-pole low voltage circuit breaker, said pole comprising an operating shaft, a fixed contact, and a movable contact operatively coupled to said operating shaft and engageable to and disengageable from said fixed contact by rotation of said operating shaft during an opening operation or a closing operation of said four-pole low voltage circuit breaker, the pole actuation booster mechanism comprising:

• a first operating member adapted to be operatively connected to said operating shaft and moving together with said operating shaft during rotation of said operating shaft from an open position to a closed position, and vice-versa, of said four-pole low voltage circuit breaker over a range of movement having a first portion of movement, a second portion of movement, and a third portion of movement, said first operating member having a first operating end;
• and
• an operating assembly comprising an elastic element operatively connected to a lever, the first operating member disengaged from said operating assembly during said first portion of movement and engaged with said lever during said second and third portions of movement,
• wherein during the closing operation of said four-pole low voltage circuit breaker, said first operating member moves first along said first portion of movement driven by said operating shaft and is disengaged from said operating assembly, and finally moves along said third portion of movement driven by said lever and transmits energy to said operating shaft.