FIELD: electrical engineering; disconnecting current circuits in devices such as measuring transducers, protective relays, and indicating instruments. SUBSTANCE: converter has current transformer module incorporating isolating current transformers, conversion and switching module incorporating normalizing amplifiers and switch; inputs of conversion and switching module are connected to outputs of current transformer module and output, to input of analog-to-digital converter whose output bus is connected to input bus of control unit; control outputs of the latter are connected to respective control inputs of conversion and switching unit, analog-to-digital converter, and output unit, and its output bus is connected to input bus of output unit; inputs of current transformer module are connected through disconnecting switch to protective unit which is connected to current transformers through controlled entity coupling unit. Such circuit arrangement provides for instant connection of converter to and disconnection from measuring circuit without disconnection of running electrical installation. EFFECT: facilitated servicing of converter, improved labor conditions for attending personnel. 1 cl, 3 dwg
