Electrical connector

Parts use plugs to join together.

These plugs help power move.

A plug is the male part. It fits into a socket.

Some plugs stay in one place. Others can be pulled out.

They use metal to carry power. They use plastic to keep it safe.

These parts help your tools work!

An electrical connector is a tool. It joins parts of a circuit together.

This lets power or data flow between them. Most connectors have two parts. The male part is called a plug. The female part is called a socket.

Connectors can be permanent or removable. Some stay on a machine. Others can be pulled out easily.

These parts use two main materials. Conductors carry the power. Many are made of copper alloys. These are metals that mix together. To stop rust, they might have a coating of gold or tin. Insulators keep the power safe. These are often made of plastic. They do not let electricity pass through them.

Some connectors are round. These are called circular connectors.

They are strong and easy to use. They often have a backshell. A backshell is a cover that protects the parts. Some connectors even have a keyway. This is a small shape that helps the plug fit only one way. This keeps people from plugging things in wrong.

An electrical connector is a special device used to join parts of a circuit.

These parts might be different parts of one machine or two separate circuits. By joining them, the connector helps create one larger circuit. This allows an electric current to run between the different pieces. Some connections are meant to be permanent and stay put. Other connections are removable so you can move portable equipment around.

You can even use an adapter to join two different types of connectors together.

Most connectors use a system of genders to fit together. The male component is called a plug. The female component is called a socket.

There are many ways these are built to work. Some are called inline connectors because they stay attached to a cable. Others are chassis connectors that stay fixed to a piece of equipment. You might also see PCB mount connectors that are soldered onto a circuit board. There are even splice connectors that join two long wires together permanently.

Building these parts requires choosing the right materials for the job. Connectors use two main classes of materials called conductors and insulators. Conductors carry the electricity and are often made of copper alloys. These alloys include metals like brass or phosphor bronze. Because copper can rust or be hard to solder, engineers often coat the pins with gold or tin.

Insulators do the opposite by stopping the electricity. These are usually made of plastic to keep the parts safe. For very hot machines, some bodies are even made of fired ceramic.

Many connectors are designed with special shapes to keep them safe. Some are circular, which makes them great for heavy use in planes or trains.

These often use a backshell to protect the wires from dust or water. Other connectors use a feature called keying. A keyway is a small shape that ensures the plug only fits one way. This stops someone from plugging an audio cable into a power outlet by mistake. Some even have locking levers or screws so they do not fall out.

Even though they are small, connectors can sometimes fail. Most failures happen when there is an open circuit or poor contact.

High heat can also cause a problem called an avalanche of failures. This happens when heat makes the resistance go up, which creates even more heat. Other times, surface corrosion can build up on the metal. However, simply unplugging and plugging a connector back in can sometimes scrape that layer off. This exposes a fresh surface so the electricity can flow well again.

An electrical connector is an electromechanical device used to join parts of an electrical circuit.

By connecting these parts, the device creates a path for electric current to flow. This allows separate components or even entirely different circuits to function together as one larger system. Some connectors are designed to be removable, which is helpful for portable equipment. Others are permanent joints that may require specific tools for assembly and removal.

In the world of computing, these connectors serve as a physical interface. They are considered part of the physical layer within the OSI model of networking.

Most electrical connectors follow a gendered system to ensure they fit correctly. The male component is known as a plug, while the female component is called a socket.

Engineers categorize these devices into four main functional groups. Inline or cable connectors are permanently attached to a cable for use with other terminals. Chassis or panel connectors are fixed to a piece of equipment so users can attach cables to stationary devices. PCB mount connectors are soldered directly to a printed circuit board to provide attachment points for wires. Finally, splice or butt connectors, such as insulation displacement connectors, are used to join two lengths of wire permanently.

To function correctly, a connector must be built from two specific classes of materials: conductors and insulators. Conductors are the parts that carry the electricity. They are typically made from copper alloys, such as brass, phosphor bronze, or beryllium copper, because these metals are conductive and malleable.

Because copper alloys can be difficult to solder or prone to corrosion, the base metal is often coated with an inert metal like gold, nickel, or tin. For example, gold coatings help reduce contact resistance in high-reliability applications. Insulators serve to stop the flow of electricity. These are usually made of plastic to act as contact carriers. In extremely high-temperature environments, such as near large incandescent lamps, connector bodies may be made of fired ceramic.

Connectors come in many different shapes and mechanical designs. Circular connectors are often used in industrial, military, and aerospace applications.

These feature a cylindrical housing and circular contact geometries, which allow for easy engagement and rugged performance. They are often used in rail or aircraft where environmental sealing is vital. In contrast, some connectors use a rectangular design, such as USB or blade connectors. Hybrid connectors offer a modular approach by allowing different types of interfaces to exist in one housing. These can mix electrical, pneumatic, or even optical fiber connections to simplify assembly and repair.

Mechanical features are often added to improve safety and reliability. Many connectors use "keying," which involves a mechanical component called a keyway. This prevents a user from plugging a connector in the wrong orientation or into the wrong device. This is critical for preventing dangerous mistakes, like plugging an audio cable into a power outlet. Some connectors also feature specific pin sequences. This ensures that certain pins, such as a safety ground, make contact before others during insertion. To prevent accidental disconnection, many housings include locking mechanisms like levers, jackscrews, or bayonet systems.

Despite their design, connectors can fail due to various factors. According to data compiled from sources like the NASA Parts Application Handbook, the most common failure is an open circuit, which occurs about 61% of the time. Poor contact accounts for 23% of failures, and short circuits make up 16%.

High temperatures can cause an "avalanche" of failures. This occurs when rising temperatures decrease insulation resistance and increase conductor resistance, which in turn generates even more heat. Surface corrosion can also increase resistance and cause intermittent connections. However, reseating a connector can sometimes fix this by scraping off the oxide layer to expose a fresh metal surface.

Advanced engineering provides solutions for even the most extreme environments. For instance, hyperboloid contacts are used when standard pin and socket designs are not enough. These contacts use longitudinal wires twisted into a hyperbolic shape that act like linear springs. This design can withstand extreme vibration and shock while requiring approximately 40% less insertion force. Additionally, many industrial connectors use backshells. These accessories protect the connector from electromagnetic interference or mechanical stress. They can also provide a hermetic seal using components like O-rings or grommets to protect against dust and water.