a mechanical system of a push-button switch such that a button attains a position at first pressure and returns to its original position on the removal of the applied force,leaving the internal mechanism and contacts in the operated condition Reference IEV 581-12-18

Note {DOM} Electronics:Electronic components and devices:Electric and magnetic passive circuitry
{GRM} n.p.
{NTE} repeating the pressure on the button releases the mechanical system and contacts to their original positions