German KNIPEX plug KNIPEX model KNIPEX price

KNIPEX 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, barrier-type terminal blocks, spring-type terminal blocks, DIN rail terminal blocks, wall-through terminal blocks, and optocoupler terminal blocks. The plastic insulation materials and conductive parts of terminal blocks directly affect their quality, determining their insulation and conductivity performance respectively.

KNIPEX plug applications

Mainly used in lighting, communications, security, and other industries. Pluggable terminals 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 pluggable terminals in these industries are: smooth insertion and extraction force, low contact resistance, and sufficient service life and fatigue resistance, which imposes high requirements on the metal spring material. This requires product designers to have considerable experience in structure and material selection. Barrier-type terminals are mainly used in: power supplies, relays (especially double-layer terminals), inverters, elevator industry (less common), and air conditioners. Requirements for this series include high torque requirements for screws during wire clamping, the distance when the screw is retracted to its highest position must be greater than the maximum wire clamping range, long-position terminals must not warp or deform, and screws must have high corrosion resistance.

KNIPEX 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 are more commonly used on printed circuit boards of electronic devices due to their simple structure. 2) By structure: By connection method: threaded connection, bayonet (quick) connection, latch connection, push-pull connection, direct plug-in connection, etc.; By contact termination form: crimping, soldering, wire wrapping; screw (cap) fixation; By environmental protection: environment-resistant electrical connectors and general-purpose electrical connectors. 3) By application: RF electrical connectors, sealed electrical connectors (glass-to-metal seal), high-temperature electrical connectors, automatic disconnect electrical connectors, filter electrical connectors, composite material electrical connectors, airport power electrical connectors, printed circuit board electrical connectors, etc.

KNIPEX plug troubleshooting

During electrical assembly, it is often found that individual core crimped wires are not fully inserted, or cannot be locked after insertion, resulting in unreliable contact. The analysis shows that burrs or dirt in the threads of individual installation holes cause jamming. Especially when the manufacturer has already assembled the last few installation holes of a plug/socket, discovering this defect requires removing all previously crimped wires from other holes one by one and replacing the plug/socket. In addition, improper matching of wire diameter and crimping hole size, or errors in the crimping process, can lead to insecure crimped connections. Therefore, before shipment, the manufacturer must perform a pass-through test on all installation holes of the delivered plug/socket samples, i.e., using loading/unloading tools to simulate inserting wires with pins or sockets to check if they can be locked. According to product technical specifications, pull-out force tests are conducted on each crimped wire. Without reliable terminal blocks, there is no reliable system engineering. Failure and reliability are two aspects of a contradictory entity that are both opposite and interconnected. Through reliability screening of terminal blocks, various failure modes and mechanisms are identified, providing valuable lessons and eliminating hidden dangers, offering a scientific basis for improving design, process, inspection, and usage, and serving as an important basis for revising and establishing technical conditions for terminal blocks. Finding measures to prevent failures and achieving the transformation from failure to reliability is the ultimate goal of failure analysis.

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