Connection system (10) for the connection of a coaxial cable (14) to an electric apparatus (2), suitable to be used for the connection of a generator (1) to a resonator (2) of an ignition system of an internal combustion engine, comprising a receptacle (12) to be attached to the end portion (66) of the coaxial cable (14) and a connector (16) to be attached to the electric apparatus (2), the receptacle (12) and the connector (16) comprising a first spring loaded retainer latch device (36) in order to retain the connector (16) inside the receptacle (12), the receptacle (12) comprising a coaxial recess (54) for fitting a coaxial connector plug (56), characterized in that the first latch device (36) is arranged in a groove (58) inside the coaxial recess (54) of the receptacle (12) to cooperate with the outer coaxial surface (60) of the connector plug (56) in order to retain the connector (16) inside the receptacle (12) when connected.