Terminal Blocks - Headers, Plugs and Sockets

Terminal blocks are versatile electronic components that are used in a range of applications. Typical applications include switching, mounting, and connecting electrical or electronic components. They are available in a vast range of models, pin counts, and pitch sizes. Common types of terminal blocks include headers, plugs, and sockets.

Headers

Headers are terminal blocks that have multiple contact points, each designed to accept a wire or cable. They are generally used for wiring and connecting components in a board. Most headers have multiple terminals, each designed to accept a certain size of wire or cable. Commonly available headers are manufactured with either a crimp-terminal or solder-terminal configuration.

Crimp-Terminal Headers

Crimp-terminal headers feature a straight strip of metal that is covered by an insulating sleeve. The sleeve creates a layer between adjacent pins and ensures the pins do not short circuit. Each pin is equipped with a small spring-loaded latch that is struck by a crimper when the wire is inserted. This ensures the wire is securely held in place.

Solder-Terminal Headers

Solder-terminal headers feature contacts that are soldered directly to the printed circuit board (PCB). Each contact is designed to accept a certain size of wire or cable. They are suitable for higher operating voltages and can be used to terminate larger diameter wires. Solder-terminal headers are generally less reliable than crimp-terminal headers.

Plugs

Plugs are designed to be used in conjunction with headers. They typically consist of an insulating body which houses a row of contact pins. The pins are then inserted in to the header in order to create an electrical connection. Plugs are often used in switch boxes and can be used to separate electrical circuits or components.

Sockets

Sockets are similar to headers, and are designed to be used in conjunction with plugs. They typically consist of an insulating body with a row of contact contacts. The contacts on a socket are designed to accept and hold the pins of a plug. Sockets are often used in lighting fixtures and for power distribution.

Conclusion

Terminal blocks are versatile electronic components that are used for a wide range of applications. There are three main types of terminal blocks - headers, plugs, and sockets. Headers are designed to be mounted to a board and have multiple contacts designed to accept a wire or cable. Plugs are used in conjunction with headers to make an electrical connection. Sockets are similar to headers and are designed to accept and hold the pins of a plug.