In a microgrid, PTC Wind Solutions is used to implement the optimization of reliability with the help of Fault Tree Analysis (FTA). The reliability of each energy source along with the non-critical load is calculated. To interpret the fault tree results, the quantitative and qualitative analysis are calculated. Then the importance measures like Risk Achievement Worth, Risk Reduction Worth, Criticality Importance and Fussel - Vesely Importance are used to calculate the sensitivity and uncertainty of fault tree results. The components which are sensitive and at high risk are calculated from the results. Using the logic gates in the PTC Windchill Solutions, the entire fault tree for a non-critical load outage is built and studied. From the results, the unreliability and unavailability of the fault tree are used to calculate the reliability and availability of non-critical load outage. From the Fault Tree Analysis, the unavailability and unreliability of non-critical load outage are calculated which illustrates the values of availability and reliability. From the fault tree analysis, the unavailability and unreliability of non-critical load outage are calculated as 0.01228, which illustrates that the availability and reliability as 98.77%. Minimal cut sets of circuit breaker across the non-critical load, Point of Common Coupling at the main grid, and a transformer are calculated from the Qualitative Analysis. The top event probability evaluation of a non - critical load is performed using the Quantitative analysis which indicates the system failure probability. The calculation of Importance measures - Risk Achievement Worth, Risk Reduction Worth, Criticality Importance, Fussel - Vesely Importance is performed. Thus, the reliability and availability of non-critical load is obtained using the PTC Windchill Solutions. The top event occurrence is caused by the basic and intermediate events of a fault trees. The components at high risk are calculated using the importance measures. Therefore, from the Qualitative and Quantitative analysis the components which are at high risk and sensitive are obtained and maintained well to optimize the reliability.