A switch , comprising: - a first electromechanical relay with guided contacts comprising a first electromagnet and a plurality of electrical contacts ; - a second electromechanical relay with guided contacts comprising a second electromagnet and a plurality of electrical contacts , a first electrical contact of the first relay and a first electrical contact of the second relay being electrically connected in series between terminals of the switch ; - a rechargeable energy reserve ; - an interconnection circuit , which connects at least some of the other electrical contacts of the first and second relays , characterized in that : - the first electromagnet is connected to control electrodes of the switch via second electrical contacts of the second relay and second electrical contacts of the first relay to condition the connection of the first electromagnet to the control electrodes to the state of the second relay ; - the second electromagnet is connected to the control electrodes via third and fourth electrical contacts of the first relay and said second electrical contacts for alternately connecting or disconnecting the second electromagnet to the control electrodes depending on the state of the first relay, the third contact being a normally closed contact connected between the energy reserve and the first electromagnet , the fourth contact being a normally open contact connected between the energy reserve and the second electromagnet ; and - the second electromagnet is further connected to one of the control electrodes via a third contact of the second relay , this third contact being a normally open contact. - a first electromechanical relay with guided contacts comprising a first electromagnet and a plurality of electrical contacts ; - a second electromechanical relay with guided contacts comprising a second electromagnet and a plurality of electrical contacts , a first electrical contact of the first relay and a first electrical contact of the second relay being electrically connected in series between terminals of the switch ; - a rechargeable energy reserve ; - an interconnection circuit , which connects at least some of the other electrical contacts of the first and second relays , - the first electromagnet is connected to control electrodes of the switch via second electrical contacts of the second relay and second electrical contacts of the first relay to condition the connection of the first electromagnet to the control electrodes to the state of the second relay ; - the second electromagnet is connected to the control electrodes via third and fourth electrical contacts of the first relay and said second electrical contacts for alternately connecting or disconnecting the second electromagnet to the control electrodes depending on the state of the first relay, the third contact being a normally closed contact connected between the energy reserve and the first electromagnet , the fourth contact being a normally open contact connected between the energy reserve and the second electromagnet ; and - the second electromagnet is further connected to one of the control electrodes via a third contact of the second relay , this third contact being a normally open contact. <EOS>