German QASS plug QASS model QASS price

QASS plug terminal blocks, as a type of connector, are an important component in the electrical industry, playing an irreplaceable and significant role. Since engineering technicians start inspections from the interfaces, i.e., the terminals, during maintenance, the design of terminal blocks is particularly crucial. Terminal blocks can be classified into: European-style terminal block series, plug-in 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 components of terminal blocks directly affect their quality, determining the insulation performance and conductivity of the terminals respectively.

QASS plug applications

Mainly applied in lighting, communications, security, and other industries. Plug-in terminals have the widest range of applications, such as in variable frequency drives, explosion-proof equipment, CNC panels, access control controllers, sensors, PLC, instruments and meters, power supplies, servo drives. The common requirements for plug-in terminals in these application industries are: smooth insertion and extraction force, low contact resistance, and the ability to meet certain life and fatigue standards, which imposes higher requirements on the material of metal spring contacts. This requires product designers to have considerable experience in structure and material selection. Barrier-type terminals are mainly applied in: power supplies, relays (especially double-level terminals), variable frequency drives, elevator industry (less common), and air conditioners. The requirements for this series of terminals 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.

QASS plug features

Field control devices feature communication capabilities, facilitating the construction of factory-level underlying control networks. The openness and consistency of communication standards ensure system openness and interoperability between devices. Standardization of function blocks and structures enables interchangeability among devices with identical functions. Decentralizing control functions to the field level provides the control system architecture with a high degree of distribution. Fieldbus technology integrates automation devices and systems into information networks, opening up broader application fields; multiple control devices can be connected on a single twisted pair, reducing installation costs; lowering maintenance expenses; improving system reliability; and providing users with greater flexibility in system integration.

QASS 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. Analysis reveals that burrs or dirt in the threaded holes of individual installation ports cause jamming. Especially in the last few installation holes of a plug/socket already assembled by the manufacturer, discovering this defect requires removing all previously crimped wires from other holes one by one and replacing the plug/socket. Additionally, improper matching between wire diameter and crimping hole size, or errors in crimping process operation, can lead to insecure crimped connections. Therefore, manufacturers must perform a pass-through test on all installation holes of sample plugs/sockets before shipment, 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 can be 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, yielding valuable lessons and eliminating hidden dangers, providing a scientific basis for improving design, processes, inspection, and usage, and serving as an important basis for revising and establishing terminal block technical conditions. The ultimate goal of failure analysis is to find measures to prevent failures, achieving the transformation from failure to reliability.

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