The application field and working principle of the CES-123-01-T-D rectangular connector are the same as all other rectangular connectors. It has a female socket and two male plugs. It is composed of a mounting panel, a terminal, two female sockets, and a cover panel or cap.

The female socket of the CES-123-01-T-D is an electrically insulating material that is made by extrusion molding. The side walls are cylindrical, and the embedded terminals are round. The pins or needles are held in the terminal and cannot be easily pulled out.

When the header is plugged into the female socket, two pins on the male plug and the two needles on the female socket make contact. This makes a continuous electrical connection, permitting the flow of electric current. There are two different types of pins: screw pins and spring pins. The screw pins have a stiff spring-like wire with one or two terminals at the end. This helps to secure the pins and establish a reliable electrical connection. The spring pins are bent wires that make contact when they are pressed into the mating female socket. The tip of the spring pin is usually square, to provide a strong mechanical grip.

The CES-123-01-T-D rectangular connector is easy to use and highly reliable. It is a popular choice for panel or wire-to-wire connections, and is usually used in automotive, telecommunications, industrial automation, and medical equipment. Its size and shape makes it ideal for tight spaces, and its ability to make a secure electrical connection makes it a popular option for connecting electrical circuits. If the connector is going to be used in the presence of shock or vibration, spring pins may be used for increased durability and reliability.