Modeling of Power Losses in Contact Systems of Low Voltage Switching Devices

The article studies the dependence of active power losses in contacts and contact systems of circuit breakers, contactors, and magnetic starters from the main parameters of electrical equipment. Models of functional dependencies of active power losses on nominal current for low voltage switching devices of some manufacturers were developed. Approximation functions of these characteristics have been compiled and the value of determination coefficient of the obtained functions of active losses and approximation error have been calculated. Graphical presentations of the investigated parameters of low-voltage equipment are shown in relation to the commutated variables.