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In electrical and electronic engineering, a ring connector, also known as a ring terminal or eyelet connector, is an uninsulated, electrically crimped connector consisting of a ferrule and one open end. Generally made out of metal, they are used for connecting a wire to a terminal or for connecting two wires together. Ring connectors come in a variety of sizes, but are always all-purpose models.

Ring terminals are used in a variety of applications including automotive wiring, wire & cable assembly, manufacturing, and industrial safety. In the automotive industry, they are commonly used in combination with a crimp tool to create electrical connections between electrical components, such as the starter motor, alternator, or battery. They are also used to attach fuses and fuse blocks (or junction blocks) to the wiring harness. In the wiring and cable assembly manufacturing sector, they are typically employed in the construction of multi-stranded wire harnesses and control panels. In the industrial safety field, ring terminals aid in the production of safety chains and earthing straps for personnel and cable security respectively.

The use of ring terminals is predominately determined by its crimp size, which is typically composed of the diameter of the ferrule and the open end thickness. When selecting a ring terminal, it is essential to keep in mind the insulation properties of the terminal’s metal type and its service temperature. For instance, stainless steel is great for wet or highly corrosive environments, with a wide range of temperature tolerance capabilities. Copper has the highest corrosion resistance when compared to the other metals, although its use should be limited to dry locations.

The working principle of a ring connector revolves around three main components: crimp size, heat-shrink tubing, and electrical insulation. The crimp size and open end thickness determine the size of the terminal that will be produced. Once the proper size is established, the connector is then crimped with a pliers or crimping tool to ensure a secure electrical connection. Heat-shrink tubing is applied over the crimp to provide an air-tight seal that prevents the electrical components from becoming corroded from moisture or salt. Finally, electrical insulation must be applied over the tubing to ensure the terminal is adequately protected against electric shock and/or fire.

Overall, ring terminals are a convenient and affordable solution for connecting electrical components in various applications. They are available in various sizes and types of insulation, allowing them to be used in both dry and moist settings. Through the simple process of crimping, heat-shrinking, and electrical insulation, they can create secure electrical connections that last for many years.

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