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Rectangular connectors are one of the most common types of electrical connectors used in many applications today. They are used to connect and transfer signals, data, and power between a variety of components in a circuit. Rectangular connectors typically use a plug-and-socket design, meaning that one side of the connector has a male section and one side has a female section. The two components are referred to as a plug and socket, respectively.

The most common applications of rectangular connectors are the connection of wires and cables in industrial equipment, computers, telecommunication systems, and consumer electronics. In the automotive and aircraft industries, they are often used to connect electrical components to one another. They are also used to connect appliances, such as stereos and televisions, to electrical power sources.

The housings used for rectangular connectors vary widely in terms of material, size, mounting arrangement, and other features. Plastic is the most common material used for housings, though metal housings are also available for more industrial applications. The size of the housing varies depending on the number and size of contacts that need to be connected. Mounting arrangements can also vary, with some requiring the use of brackets for mounting on a panel, and others requiring direct soldering to the circuit board.

The working principle of rectangular connectors is relatively simple. A signal or power is transmitted from one connector to the other using the metal contacts within each connector. This is done by connecting the two pieces of metal within the connectors, completing the electrical circuit between them. The electrical connection is then secured with a cover or gasket that helps ensure the connection will not become disconnected due to vibration or other external forces.

In summary, rectangular connectors are versatile electrical connectivity solutions, used for a variety of applications. They are usually constructed from plastic or metal housings, and vary in size depending on the number and size of contacts that need to be connected. The working principle of rectangular connectors is relatively simple, involving the connection of two metal contacts within the connector to complete an electrical circuit.