Abstract: The subject of the study is the device of automatic input of the reserve (ATS) of domestic production. The presence of automatic input of the power reserve (ATS) for consumers of category I is an important condition for the trouble-free operation of the enterprise. Equipment for the implementation of the ATS is commercially available. But it is used at different enterprises, with different operating conditions. Due to the fact that the ATS schemes are implemented on different equipment, in each case, you should develop your circuit design solution. This paper proposes the development of a scheme automatic transfer switch (ATS) diesel power plant (DPP) for the network of 6/10 kV for consumers of I category.The implementation of the scheme, the ATS is offered on the device BMRS-15kh company "mechatronics". The paper describes the programmable functions of the device, the functional scheme of the automatic reserve input algorithm, describes the conditions of the ATS input with a restriction on the proposed logical solution.The proposed scheme of automatic input of the reserve is able to operate automatically without human intervention, which eliminates possible incorrect actions of operational personnel. Analysis of the proposed circuit solutions on the device BMRS-15kh company "mechatronics" can be recommended as a model for domestic plants producing power equipment.