16373-2

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Terminal blocks have long been a mainstay of electrical installations, playing important roles in countless applications over the years. Partially due to a comprehensive range of standards established to guarantee consistent performance and reliability, from single-block through high-density multi-block designs, terminal blocks remain an invaluable tool for any application involving the transmission, routing, and connection of electrical signals. The IEC 16373-2 standard is specifically dedicated to power distribution terminal blocks. This standard was established to provide common guidelines to guarantee reliable and safe operations for a wide range of applications. In particular, the IEC 16373-2 standard provides requirements for performance, design, installation, and safety of terminal blocks used for power distribution.IEC 16373-2 has been developed in compliance with the latest wide-scale electrical safety and performance regulations. This standard covers terminal blocks up to 1000 volts AC and 1500 volts DC, as well as specific requirements for neutral and control circuits. The requirements are divided up into four main categories: Electrical Performance, Physical Properties, Installation, and Safety.The Electrical Performance requirements dictate various criteria regarding the transmission of electrical signals. These criteria include for example: electrical contact resistance values, the current carrying capacity, dielectric strength, and temperature rise due to steady-state operating current.The Physical Properties requirements include design parameters such as the design size & shape, the dielectric strength, the insulation distance, the maximum mechanical strength of the clamping part after insertion, and the maximum pull-out force.The Installation requirements cover criteria such as terminal identification, mounting location, and other factors.The Safety requirements, which require terminal blocks to be designed fireproof, are specifically include: spark emission, flight distance and burning behavior of the insulating material, and the fire resistance of the used plastic material.The application range for IEC 16373-2 terminal blocks is quite wide. It covers terminal blocks used for isolated power supplies, as well as those used in the downstream distribution of electrical loads. This includes low voltage or low current (below 60A) applications, such as control and automation, telecommunications, process automation, and machine tooling.The working principle of IEC 16373-2 terminal blocks is simple and effective. These blocks are designed for easy usability, enabling fast and reliable connection in most applications. Typically, the terminal block consists of a metal clip at one end that is designed to fit securely around the conductors being feeding into the terminal which forms a secure connection. The connection is completed through either screw and clamp type, spring clamp type, screw-less, pluggable, and other connections methods.Additionally, the IEC 16373-2 terminal blocks often feature a built-in insulation housing. This insulation housing protects the internal components from any external electrical interference, as well as providing shock absorption and segregation between different signals and circuits.Given the wide range of applications for which IEC 16373-2 terminal blocks offer, it is no surprise that these are popular options for electrical installation needs. These blocks provide a reliable and secure connection in a wide range of applications, meeting the necessary requirements of the IEC 16373-2 standard.

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