backshell (plural backshells) (mechanical) Part of an electrical conductor or other electrical device, such as a cable clamp or adapter, that is threaded onto the rear connector accessory threads of plug or receptacle connectors to make up the total connector assembly.
The backshell protects in many ways. If it includes a grometted cable entry it can prevent ingress of dirt, moisture and liquids. This environmental seal can be maintained provided that all grommet entries are either populated with a wire or cable, or are plugged. Maintaining the seal also depends on ensuring that the cables are never bent to an excessive angle, typically not more than 130d, away from the connector axis. Using a backshell with strain relief or a cable clamp can protect from excessive cable flexing and bending, as well as removing loading from the connector pin solder or crimp joints. When specifying backshells, 45d, 90d or straight through cable entries can be chosen.
Sometimes it’s necessary to locate extra components, such as a filter network, close to a connector. In such cases, extended backshells can be ordered to accommodate this extra space requirement. Both standard and extended