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标题: Understanding Relay Connections and Their Practical Applications Relay connections play a fundamental role in modern electrical and electronic systems, acting as the bridge between low-power control circuits and high-power devices. A relay is an electrically operated switch that allows one circuit to control another circuit, often with a significant difference in voltage or current. This functionality is crucial in applications ranging from household appliances to industrial automation, automotive systems, and robotics. At its core, a relay consists of a coil, an armature, and one or more sets of contacts. The coil, when energized by a control signal, generates a magnetic field that moves the armature. This movement opens or closes the contacts, thereby controlling the flow of electricity in the connected load circuit. The design ensures that a small electrical signal can safely switch much larger currents without direct electrical contact, offering both control and protection.