A switching apparatus for medium voltage electric systems, said switching apparatus comprising one or more electric poles, each electrically coupleable with a corresponding electric line, said switching apparatus comprising: - for each electric pole, a fixed contact and a corresponding movable contact, said movable contact being reversibly movable, along a corresponding translational displacement axis, between a decoupled position from said fixed contact and a coupled position with said fixed contact, said movable contact moving from said decoupled position to said coupled position during an closing manoeuvre of said switching apparatus, said movable contact moving from said coupled position to said decoupled position during an opening manoeuvre of said switching apparatus; - an actuation assembly having at least an electric motor and, for each electric pole, an actuation shaft rotating about a rotation axis during a closing manoeuvre or an opening manoeuvre of said switching apparatus; - for each electric pole, a motion transmission assembly including: - an eccentric mechanism operatively coupled with said actuation shaft, said eccentric mechanism being actuated by rotational mechanical forces provided by said actuation shaft to actuate said movable contact during a closing manoeuvre or an opening manoeuvre of said switching apparatus; - a transmission mechanism operatively coupled with said eccentric mechanism and with said movable contact, said transmission assembly being actuated by translational mechanical forces provided by said eccentric mechanism to actuate said movable contact during a closing manoeuvre or an opening manoeuvre of said switching apparatus; wherein said eccentric mechanism is movable between a first end-of-run position, at which said movable contact is decoupled from said fixed contact, and a second end-of-run position, at which said movable contact is coupled to said fixed contact, during an opening manoeuvre or a closing manoeuvre of said switching apparatus, characterised in that said eccentric mechanism reaches said first end-of-run position at the end of an opening manoeuvre of said switching apparatus and, with said at least an electric motor switched off, stably maintains said first end-of-run position until a closing manoeuvre of said switching apparatus is carried out, and wherein said eccentric mechanism reaches said second end-of-run position at the end of a closing manoeuvre of said switching apparatus and, with said at least an electric motor is switched off, stably maintains said second end-of-run position until an opening manoeuvre of said switching apparatus is carried out. - for each electric pole, a fixed contact and a corresponding movable contact, said movable contact being reversibly movable, along a corresponding translational displacement axis, between a decoupled position from said fixed contact and a coupled position with said fixed contact, said movable contact moving from said decoupled position to said coupled position during an closing manoeuvre of said switching apparatus, said movable contact moving from said coupled position to said decoupled position during an opening manoeuvre of said switching apparatus; - an actuation assembly having at least an electric motor and, for each electric pole, an actuation shaft rotating about a rotation axis during a closing manoeuvre or an opening manoeuvre of said switching apparatus; - for each electric pole, a motion transmission assembly including: - an eccentric mechanism operatively coupled with said actuation shaft, said eccentric mechanism being actuated by rotational mechanical forces provided by said actuation shaft to actuate said movable contact during a closing manoeuvre or an opening manoeuvre of said switching apparatus; - a transmission mechanism operatively coupled with said eccentric mechanism and with said movable contact, said transmission assembly being actuated by translational mechanical forces provided by said eccentric mechanism to actuate said movable contact during a closing manoeuvre or an opening manoeuvre of said switching apparatus; wherein said eccentric mechanism is movable between a first end-of-run position, at which said movable contact is decoupled from said fixed contact, and a second end-of-run position, at which said movable contact is coupled to said fixed contact, during an opening manoeuvre or a closing manoeuvre of said switching apparatus, characterised in that said eccentric mechanism reaches said first end-of-run position at the end of an opening manoeuvre of said switching apparatus and, with said at least an electric motor switched off, stably maintains said first end-of-run position until a closing manoeuvre of said switching apparatus is carried out, and wherein said eccentric mechanism reaches said second end-of-run position at the end of a closing manoeuvre of said switching apparatus and, with said at least an electric motor is switched off, stably maintains said second end-of-run position until an opening manoeuvre of said switching apparatus is carried out. - an eccentric mechanism operatively coupled with said actuation shaft, said eccentric mechanism being actuated by rotational mechanical forces provided by said actuation shaft to actuate said movable contact during a closing manoeuvre or an opening manoeuvre of said switching apparatus; - a transmission mechanism operatively coupled with said eccentric mechanism and with said movable contact, said transmission assembly being actuated by translational mechanical forces provided by said eccentric mechanism to actuate said movable contact during a closing manoeuvre or an opening manoeuvre of said switching apparatus;