In today's world, the need for reliable and efficient control systems in various industries is more important than ever. Among the key components that help facilitate these systems, relays play an indispensable role. A relay is an electrically operated switch used in numerous applications such as automation systems, automotive electronics, and industrial control systems. To ensure proper integration and functionality of relays, application notes are essential resources that guide engineers and designers in their implementation. This article will delve into the significance of relay application notes, with a particular focus on Meishuo's contributions to the field.