Device for three-phase network control

The invention relates to the commutation devices meant for man and animal protection from electrocution, as well as for protection from disconnection of one of the phases of the electrotechnical installations. The device contains a current transducer 1, a preamplifier 2, a comparator 3, a time delay point 4, a thyristor-switch 5, all being connected in series, as well as a final-control relay P1. Between the thyristor-switch 5 and the final-control relay P1 there are connected an optocouple 6 and a triac VS1 with increased load-carrying capacity. Inventia se refera la dispozitive de comutare, destinate pentru protectia omului si animalelor de electrocutare, precum si la protectia de la deconectarea unei din fazele instalatiilor electrotehnice. Dispozitivul include un traductor de curent 1, un amplificator preliminar 2, un comparator 3, un ansamblu de retinere in timp 4, o cheie tiristor 5 - toate unite consecutiv, precum si un releu executiv P1. Intre cheie tiristor 5 si releul executiv P1 este introdus un optocuplu 6 si un simistor VS1 cu capacitate de sarcina sporita.