FIELD: computer engineering. SUBSTANCE: device has load current simulating unit, squarer, two digital-to-analog converters, limiting resistor, two d.c. amplifiers, differentiating circuits formed by parallel-connected resistors and capacitors two, groups of switches, group of scaling resistors, feedback resistor, comparator, adder, inverter, analog-to-digital converter, multiposition selector switch, reference-voltage source, counter, OR gate, device trigger input, timer, pilot lamp, load current setting element, display unit, decoder. As compared to known design alternates, this device provides for more accurate selection of current conductors due to considering dependence of heating constant on conductor temperature and, hence, due to more accurate simulation of conductor temperature in the course of load current variation. EFFECT: improved accuracy of device. 4 dwg
