With the increasing complexity of electrical equipment in mining enterprises, the development and analysis of methods to enhance the reliability of technical devices within power supply systems are becoming increasingly relevant. This article focuses on assessing the reliability parameters of workshop network circuits in mining enterprises equipped with single-transformer substations operating at 10 and 0.4 kV, considering various redundancy methods. Research objective is to evaluate the reliability parameters of different redundancy methods for power supply circuits in facilities with transformer substations at medium voltage (MV) and low voltage (LV), with respect to low-voltage switchgear consumers in mining operations. Research target is the power supply system of an auxiliary production workshop at a mining enterprise (Kemerovo). The study examines the following network reliability parameters: probability of failure-free (normal) operation, P(t); probability of failure occurrence, Q(t); failure flow rate, ω_circuit; time between failures (TBF), Т_TBF. The analysis covers the following circuit configurations: without redundancy; with redundancy at MV; with redundancy at LV; with dual redundancy (at both MV and LV). Estimation results indicate that the TBF for the nonredundant circuit is 2.04 times lower than for the LV redundancy circuit, 2.11 times lower than for the MV redundant circuit, and 2.8 times lower than for the dual redundant circuit. Redundancy proves to be a technically and economically justified method for improving the P(t) parameter of the facility’s power supply system. The obtained results can be integrated into power supply system design (to optimize structural circuits and select rational redundancy methods for components), maintenance program development (to develop justified maintenance and repair schedules), reliability monitoring system development (to enable continuous monitoring of equipment status in mining enterprise workshops).