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D-Shaped connectors, also known as D-Sub connectors, are commonly used in electronics equipment, as they provide a bridge between two circuits. As the name implies, the connectors are D-shaped and can be used to link two circuits or to allow higher current carrying applications. A backshell is an additional piece of kit which houses and encloses the internal parts of a connector, preventing any wobbly wires or damaged contacts from occurring. Combined with a hood, they are used to provide a seal to protect against dirt and dust.

Backshells for D-Sub connectors are available in various sizes, materials and shapes and usually consist of two parts; the backshell itself, and the hood. The backshells provide protection for the contacts within the connector and allows for ease of maintenance. The hood serves as a seal and may be an integrated part of the backshell or provided separately. The backshell may also provide strain relief for a particular application, such as where the housing of the cable or wiring is subject to movement.

Common materials for backshells and hoods include metals such as aluminum, stainless steel, and brass, or plastics such as ABS, polycarbonate, and nylon. Metal backshells are typically used where strength or fire retardancy is needed, as their robustness can provide very effective protection against mechanical shock and vibration, while plastic backshells may be preferred where additional strain relief is required. Different metal materials may also be used for corrosive or waterproofing applications.

Backshells are designed to fit multiple shell sizes of D-Sub connectors, helping to provide protection against the environment, such as in extreme temperatures or in areas where shock or vibration are present. Depending on the application, the two parts of the backshell may be held in place with screws which allow for ease of installation and disassembly. Alternatively, clips may be used for temporary holding in certain applications.

The working principle of a D-Sub connector is simple; it consists of two circuits, one of which is connected to a link between the contacts. When the circuits are connected, the connection is made and electricity can then flow through it. This principle is the same regardless of the shape of the connector.

D-Sub connectors are widely used in electronics equipment, as they provide enhanced protection against dust and dirt and are able to carry higher currents. The use of backshells and hoods provides an added layer of protection, helping to ensure the quality of the connection and preventing any damage to the contacts or the circuits themselves. This makes them especially well suited for use in applications which require reliable electrical connections, such as in industrial, automotive, and aerospace systems.

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