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Terminal Blocks - Headers, Plugs and Sockets is an amalgamation of modular, stackable electrical connectors. The benefits of terminal blocks and headers are numerous; they are available in various layouts, sizes, styles, spacings, and heights. Additionally, these connectors can be easily adapted to accommodate a variety of needs, from signal, power, and data to control applications.

The most basic type is the single or double pole, Figure 1, that has two points of connection closer together than those of the multi pole. This creates a ‘jumper’ type of terminal that is most often seen in control panel applications. A single or double pole terminal block spaced further apart than multi pole connectors is referred to as a ‘peel and stick’ plug. These types of plugs are very common in equipment applications and require wiring along the length of the plug to create the connection points.

Figure 2 illustrates a multi-pole connector. This type of terminal is preferred for high-powered applications, such as wind farms, where multiple power and/or signal contacts are needed. A majority of terminal blocks and headers are designed with the capability to accommodate one or multiple jumper bars depending on the power requirements. These multipoles are also able to provide keying among the jumpers, eliminating the need for complex wiring.

Figure 3 shows the caged terminal block or a snap-in connector. This style is most common in power applications, such as switching panels and industrial equipment. As the name implies, this type of terminal block snaps into place with the help of a spring. To keep the part from coming out of its housing, the spring applies a constant downward pressure.

The most suitable terminal block or header for controlling a variety of items can be determined by examining the application requirements. Terminal Blocks - Headers, Plugs and Sockets can have a combination of high current/voltage ratings, small size that supports many contact types, multiple types of keying and polarizing options, multiple pin configurations, and a variety of contact arrangements.

When present, the parts are easily connected and anchored within the parts housing. This secure connection is accomplished through connecting screws that are situated at the bottoms of the parts’ sides and then driven by a driven tool. Connections can also be made when the plug or connector pins are placed in a male or female mating terminal. Connecting the plug or connector pins to a male or female mating terminal is a process known as sealing, and it offers a high degree of contact integrity and electrical safety.

Once installed, terminal blocks and headers maintain their proper integrity. In addition, the parts’ isolation remains intact even after installation. This is done by allowing a sensor to detect the integrity of the terminals within the block and take the necessary steps to ensure proper contact.

Terminal Blocks - Headers, Plugs and Sockets provide a reliable, flexible and cost effective solution for a variety of industrial electrical applications. The parts are resistant to shock and vibration, easy to install, and available in multiple layouts, sizes, spacings, heights, and shapes. By offering numerous contact arrangements and the ability to accommodate a wide range of power and/or signal requirements, Terminal Blocks - Headers, Plugs and Sockets are the perfect choice for a wide range of applications.

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