1741999

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Terminal Blocks - Headers, Plugs and Sockets

Terminal blocks have become a one-stop solution to the needs of connecting signals and power in numerous industrial applications. The 1741999 standard defines the features and requirements of headers, plugs and sockets primarily used for the interconnection of low voltage, sub-assemblies and equipment, using maximum signal voltages up to 250 V.

Application Fields

Modern supply chains set increasingly stringent standards and place premium on cost efficiency, production and assembly automation. For local interconnection of sensors, actuators and other devices in control and automation, terminal blocks provide the perfect balance between cost efficiency and flexibility. They meet a variety of needs within the industrial automation network:

• Low voltage and I/O connections in machinery and devices;
• Protection of individual field buses in industrial networks;
• Power transmission and distribution for and from low voltage devices.

Terminal blocks can be used in a number of dedicated and custom applications including in-field maintenance and repair, optical and gripper connections, customization and programming, and many more.

Working Principle

A typical terminal block is composed of a header, plug and socket. The header is a bar or board where sockets or terminals are fastened. Multiple plugs are provided, which link to the header and accept a terminal connection. The latter typically consists of a conductor or wire, which can be easily snapped into the plug. The connection is generally secured by a set screw. When the plug is installed into the socket, a reliable electrical connection can be established.

Terminal blocks come in different shapes, sizes and types that are suited for a variety of applications. They can also be configured for both horizontal and vertical mounting.

The 1741999 standard outlines the essential features of headers, plugs and sockets, from temperature ratings and voltage performance to insulation requirements and grounding polarization. This standard also frames the product performance requirements and defines evaluations for parts specified under the revised version.

Installation and Safety Precautions

The installation requires special care to guarantee safety and reliable operation. When installing terminal blocks, important precautions must be taken to prevent any possible electric shock or fire due to accidental shorts. To ensure safe installations, local codes must be consulted and safety guidelines followed at all times. Components should be tightly secured to avoid loose connections, and finger protection must always be observed.

For use in the hazardous areas, the isolated fiber-optic couplers should be used. For the operation of equipment designed to be operated by end-users, double insulation and IP 67 protection should be in place. All components should be kept away from flammable materials, radiators, and other sources of heat. The voltage ratings should be clearly visible on the terminal blocks. Moving parts should be examined regularly for any damage.

In some cases, special safety measures should be taken for the personnel or equipment exposed to shock or fire, such as flame retardant insulation or filter guards. Flame retardant insulation must be tested to a standard that meets the requirements of the National Electrical Code.

Conclusion

Although the 1741999 standard defines the operational and performance criteria for terminal blocks, each application demands specific designs, materials, and safety considerations. Find the right components for your electrical and automation needs and ensure that they comply with all compliance regulations.

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