Abstract
The objective of this paper is to evaluate the main indicators of operational reliability for an electromechanical system consisting of five belt conveyors on rollers arranged in series. Knowing the behavior of each conveyor determines the analytical expression of the reliability of the system. The functions of the density of probability of occurrence of defects, the intensity of failure, as well as the value of the average fault-free operating time of the strip relay are determined. The methodology allows the generalization of computational relations for technical systems with series structure.