These rope operated safety switches are installed on machines or conveyor belts, to activate the emergency stop of the machine on every hand intervention on the rope, from any point. They allow cost savings on machines of medium-large size, where normally many emergency stop push buttons can be replace by one single switch. Provided with self-control function, they constantly check their correct working operation, signalling with the opening of the contacts on eventual loosening or breaking of the rope. These safety switches, after their activation, keep the contacts open till the reset push button is manually pulled, even if the rope is left free.