A switch relay, a crucial component in modern electrical systems, plays a pivotal role in controlling circuits with high voltage or current using low voltage or current signals. It functions as an electrical switch activated by an electromagnet, offering a wide array of applications in various industries, from home automation to automotive systems and industrial machinery. In this article, we will explore the fundamental workings of a switch relay, its types, applications, and advantages.
What is a Switch Relay? A switch relay is an electromechanical device designed to open or close electrical circuits under the control of an external signal. The primary function of a relay is to control a high-power circuit with a low-power input. It consists of several key components: the coil (electromagnet), contacts (switches), a spring mechanism, and a housing. When an electric current passes through the coil, it generates a magnetic field that either attracts or repels a movable armature connected to a set of contacts. Depending on the design, the contacts are typically either normally open (NO) or normally closed (NC). A normally open contact remains disconnected until the relay is activated, while a normally closed contact is connected by default and opens when the relay is triggered.
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