German Schrack plug, Schrack model, Schrack price

Schrack plug terminal blocks, as a type of connector, are important components in the electrical industry, playing an irreplaceable and significant role. Since engineering technicians start troubleshooting by checking interfaces, i.e., terminals, the design of terminal blocks is particularly important. Terminal blocks can be classified into: European-style terminal block series, pluggable terminal block series, transformer terminal blocks, building wiring terminals, fence-type terminal blocks, spring-type terminal blocks, DIN rail-mounted terminal blocks, bulkhead terminal blocks, and optocoupler terminal blocks. The plastic insulation materials and conductive parts of terminal blocks directly affect their quality, determining the insulation performance and conductivity of the terminals respectively.

Schrack plug structure

An electrical connector consists of a fixed-end electrical connector, i.e., female contacts (referred to as socket), and a free-end electrical connector, i.e., male contacts (referred to as plug). The socket is mounted on the equipment via its square (or round) flange (some use soldering), while the plug is generally connected to cables, achieving connection between plug and socket through a coupling nut. An electrical connector comprises three basic units: housing, insulator, and contacts. 1) Housing: The housing of an electrical connector refers to the outer shell of the plug and socket, the coupling nut, and rear accessories. The housing protects internal components such as insulators and contacts (collectively referring to pins and sockets) from damage. Positioning keys on the housing ensure proper alignment between plug and socket. The coupling nut is used for connecting and disconnecting the plug and socket. Rear accessories protect the wire-to-contact termination points from damage and secure the cable. The housing also provides a certain degree of electromagnetic shielding. Housings are typically machined from aluminum alloy (machining, cold extrusion, die casting). Steel housings are mostly used for glass-sealed and high-temperature electrical connectors. 2) Insulator: Composed of pin insulators, socket insulators, interface seals, and wire seals. It holds pins and sockets in position and ensures electrical insulation between contacts and between contacts and the housing. Sealing measures achieved through insulators, interface seals, and wire seals improve the environmental resistance of the electrical connector. To withstand high temperatures, low temperatures, and flame retardancy, and to ensure stable and reliable geometric dimensions, insulators are mostly molded from thermosetting plastics. Interface seals and wire seals are formed by molding silicone rubber, etc. 3) Contacts: Contacts include male and female contacts, sometimes referred to as pins and sockets. Connection methods include soldering, crimping, press-fit, and wire wrapping, used to achieve circuit connections. Pins and sockets are key components of electrical connectors, directly affecting reliability. They are mostly machined from elastic copper alloys with good conductivity, with silver or gold plating on the surface to achieve low contact resistance and corrosion resistance. Sockets generally include split-type, wire-spring, crown-spring, and stamped types. Structural features include: environmental resistance, bayonet (quick) connection, multiple keyways (anti-misinsertion), crimped connection between contacts and wires (facilitating fault handling with single-wire insertion/removal). The housing with a shielding ring ensures 360° electromagnetic interference shielding capability.

Schrack plug classification

1) By shape: Circular electrical connectors, rectangular electrical connectors. Circular electrical connectors are most widely used in military equipment (aviation, aerospace) due to their structural characteristics. Rectangular electrical connectors, due to their simple structure, are more commonly used on printed circuit boards of electronic devices. 2) By structure: By connection method: threaded connection, bayonet (quick) connection, latch connection, push-pull connection, direct insertion connection, etc.; By contact termination form: crimping, soldering, wire wrapping; screw (cap) fixation; By environmental protection: environmental-resistant electrical connectors and standard electrical connectors. 3) By application: RF electrical connectors, sealed electrical connectors (glass-sealed), high-temperature electrical connectors, automatic disconnection electrical connectors, filter electrical connectors, composite material electrical connectors, airport power electrical connectors, printed circuit board electrical connectors, etc.

Schrack plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also fieldbus capabilities. In DCS, fieldbus is widely applied. The following issues should be noted when using fieldbus: 1) Communication distance. Fieldbus communication distance generally has certain requirements. For example, PROFIBUS/DP at 12Mbps rate, using standard cable, can reach 200m; if using 187.5kbps rate, it can reach 1 000m. Communication distance has two meanings: first, the distance achievable between two nodes without repeaters; generally, distance is inversely proportional to communication rate; second, the distance between the two farthest nodes in the entire network. Manufacturers' descriptions of this are often unclear. In actual use, the entire network range must be considered. Electromagnetic signals take time to transmit through cables, especially in some high-speed fieldbuses. If distance increases, some communication parameters must be modified; 2) Cable selection. The site environment determines fieldbus communication speed and medium. Generally, fieldbus uses electrical signals to transmit data, inevitably affected by surrounding electromagnetic environments during transmission. Most fieldbuses use shielded twisted pair cables. Note that different fieldbuses may require different shielded twisted pairs. Fieldbus developers usually specify a special cable; only by correctly using this cable can the specified rate and transmission distance be achieved. In extremely harsh electromagnetic conditions, optical fiber is a reasonable choice; otherwise, local interference may affect the operation of the entire fieldbus network; 3) Isolation. Generally, fieldbus electrical signals are electrically isolated from the device interior. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices on the segment. Without isolation, high voltage signals will continue to damage other internal circuits, leading to serious consequences; 4) Shielding. The outer layer of shielded cables used in fieldbus must be grounded at one point. If high-frequency interference is severe, multi-point capacitive grounding can be used; multi-point direct grounding is not allowed to avoid ground loop currents; 5) Connectors. Fieldbus generally does not have strict regulations on connectors, but improper handling can affect system communication. For example, fieldbus generally uses bus-type daisy-chain connections. When connecting each device, attention must be paid to how to insert and remove equipment without affecting existing communication, which places certain requirements on connectors; 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection phenomena. Resistive matching should be used at both ends of each bus segment. The first function is to absorb reflections; the second is to achieve correct voltage levels at both ends of the bus to ensure communication. Therefore, fieldbus technology is the intersection and integration of control, computer, and communication technologies. Its emergence and rapid development reflect the control field's requirements for reducing costs, improving reliability, enhancing maintainability, and increasing intelligence in data acquisition.

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