German SCHNIER plug SCHNIER model SCHNIER price

SCHNIER plugs are accessory products used to achieve electrical connections and are categorized industrially as connectors. As the level of industrial automation increases and industrial control requirements become stricter and more precise, the consumption of terminal blocks has gradually risen. With the development of the electronics industry, the scope of use for terminal blocks has expanded, and their varieties have increased. Besides PCB board terminals, the most widely used types include hardware terminals, nut terminals, spring terminals, and more. Terminal blocks are applied to facilitate wire connections; they are essentially metal strips enclosed in insulating plastic, with holes at both ends for inserting wires and screws for tightening or loosening. For example, two wires may sometimes need to be connected and other times disconnected; in such cases, terminals can be used to connect them, allowing for disconnection at any time without the need for welding or twisting together, which is very convenient and fast. They are also suitable for large-scale wire interconnections. In the power industry, there are dedicated terminal strips and terminal boxes filled with terminal blocks, including single-layer, double-layer, current, voltage, standard, and disconnectable types. A specific crimping area is required to ensure reliable contact and sufficient current carrying capacity.

SCHNIER plug applications

Mainly applied in industries such as lighting, communications, and security. Plug-in terminal blocks have the widest range of applications, such as in variable frequency drives, explosion-proof equipment, CNC panels, access control controllers, sensors, PLC, instruments, power supplies, servo drives. The common requirements for plug-in terminal blocks in these industries are: smooth insertion and extraction force, low contact resistance, and the ability to meet certain life and fatigue standards, which places higher demands on hardware spring materials. This requires product designers to have experience in structure and material selection. Barrier terminal blocks are mainly applied in: power supplies, relays (especially double-layer terminals), inverters, elevator industry (less common), and air conditioning. The requirements for this series of terminals include high torque requirements for screws during wire crimping, the distance when the screw is retracted to its highest position must be greater than the maximum wire crimping range, long-position terminals must not warp or deform, and screws must have high corrosion resistance.

SCHNIER plug material

1) The material of the female or male terminal shall be copper alloy, or plated copper alloy, nickel, or nickel alloy. [Exception: If the structure of the electrical appliance or device permits, the female or male terminal may be plated sheet metal, or a non-plated but corrosion-resistant alloy. 2) If formed female terminals or trimmed male terminals appear in the form of a terminal strip, when the terminal strip is continuously fed into the processing tool, the terminals are crimped and separated from the terminal strip; in this case, the edge where the terminal connects to the terminal strip does not require plating. The standard terminals used in temperature and thermal cycling tests shall be tin-plated sheet steel or corrosion-resistant steel. According to the Rockwell 30T hardness scale, their hardness shall be Rockwell hardness 68 ± 5. Exception: If the female terminal is only suitable for connecting to male terminals made of copper alloy, then standard terminals made of C26000 copper alloy shall be used for testing. 2.3) According to the Rockwell 30T hardness scale, the hardness of standard terminals made of brass shall be 62 ± 7.

SCHNIER plug applications

Each fieldbus has its own application areas. For example, FF and PROFIBUS-PA are suitable for process control in industries such as petroleum, chemical, pharmaceutical, and metallurgy; LonWorks, PROFIBUS-FMS, and DevieceNet are suitable for buildings, transportation, agriculture, and other fields; DeviceNet and PROFIBUS-DP are suitable for the manufacturing industry. However, these divisions are not absolute, as each fieldbus strives to expand its application areas and penetrate each other's markets. Most fieldbuses are backed by one or several large multinational companies that have established corresponding international organizations to expand their influence and gain more market share. For example, PROFIBUS is mainly supported by Siemens Company, and the PROFIBUS International User Organization was established. WorldFIP is mainly backed by Alstom Company, and the WorldFIP International User Organization was established.

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