German VOLLMER plug, VOLLMER model, VOLLMER price

VOLLMER plugs are accessory products used to achieve electrical connections and are categorized as connectors in industry. As industrial automation levels rise and industrial control requirements become stricter and more precise, the consumption of terminal blocks is gradually increasing. With the development of the electronics industry, the scope of use for terminal blocks is expanding, and their varieties are becoming more diverse. 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 need to be connected at times and disconnected at others; in such cases, terminals can be used to connect them, allowing for disconnection at any time without the need for welding or twisting, which is very convenient and quick. They are also suitable for interconnecting large numbers of wires. 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 certain crimping area is required to ensure reliable contact and sufficient current carrying capacity.

VOLLMER Plug Classification

Terminal blocks can be classified into European-style terminal block series, pluggable terminal block series, transformer terminal blocks, building wiring terminals, barrier-type terminal block series, spring-type terminal block series, DIN rail terminal block series, feed-through terminal block series, and optocoupler terminal blocks. Pluggable types consist of two parts that connect via plug-in: one part clamps the wire and then plugs into the other part, which is soldered onto the PCB board. Based on this mechanical principle, the anti-vibration design ensures long-term airtight connection and product reliability. Assembly ears can be added to both ends of the socket; these ears largely protect the contacts and prevent poor alignment, while ensuring the socket inserts correctly into the housing. Sockets can also feature assembly clips and locking clips. Assembly clips provide more secure fixation to the PCB board, and locking clips can lock the housing and socket after installation. Various socket designs accommodate different insertion methods into housings, such as horizontal, vertical, or angled orientation relative to the printed circuit board, allowing selection based on customer requirements. Both metric and standard wire gauges can be selected, making this the best-selling terminal type on the market. Barrier-type terminals enable safe, reliable, and effective connections, especially widely used in high-current and high-voltage environments. Spring-type terminals are new terminal blocks utilizing spring mechanisms, widely applied in global electrical and electronic engineering industries: lighting, elevator control, instruments, power supplies, chemical, and automotive power. DIN rail mounting adopts reliable screw connection technology, electronic fuse technology, and the latest electrical connection technology, widely used in power electronics, communications, electrical control, and power supply fields. DIN rail types use wire clamping and unique self-locking screw designs, making wire connections reliable and safe. This series features an attractive appearance and can be equipped with various accessories, such as short-circuit links, marking strips, and partitions. Feed-through types use screw connection technology, with insulation material made of PA66 (flammability rating: UL94, V-0), and connectors made of high-quality highly conductive metal materials.

VOLLMER 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) For formed female terminals or trimmed male terminals supplied in carrier strip form, when the carrier strip is continuously fed into processing tooling such that the terminals are crimped and separated from the carrier strip, the edges where the terminals join the carrier strip do not require plating. The standard terminals used in temperature and thermal cycling tests shall be tin-plated 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 connection with copper alloy male terminals, 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.

VOLLMER Plug Applications

Each fieldbus has its 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 manufacturing. 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 corporations and have established corresponding international organizations to expand their influence and gain more market share. For example, PROFIBUS is mainly supported by Siemens Company and has established the PROFIBUS International User Organization. WorldFIP is mainly backed by Alstom Company and has established the WorldFIP International User Organization.

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