The reliability of electronic components consists of two parts, one is the inherent reliability of the components; the other is the reliability of the components. Inherent reliability is the basis for the reliability of components, and it mainly depends on the component manufacturers to carry out effective control from the aspects of design and manufacture to ensure that the manufactured components reach the required reliability level. The use reliability starts from the use, how to ensure and improve the reliability of the components, so that it can meet the reliability requirements of the whole system.

Since the relay is a mechatronic component, it is composed of electromagnetic and mechanical transmission parts. Compared with other electronic components, it is much more complicated. In addition, some assembly adjustments in the manufacturing process are manually operated, so the consistency of the product is and less reliable. However, if some preventive measures are taken in use, satisfactory results can still be achieved. In the failure analysis of the failure relay, it was found that the failure caused by the use accounted for more than 30%.