Common fatal faults in terminal blocks

From the point of view of the use of the terminal, the function that should be achieved is: the place where the contact should be conducted must be conductive, and the contact is reliable. Where the insulation part should not be conducted, it must be reliably insulated. There are three common types of fatal faults in terminal blocks:

Poor contact

The metal conductor inside the terminal is the core part of the terminal. It transmits the voltage, current, or signal from the external wire or cable to the corresponding contact piece of the corresponding connector. Therefore, the contact must have an excellent structure, stable and reliable contact retention and good electrical conductivity. Due to the unreasonable structural design of the contact, incorrect selection of materials, unstable mold, poor processing dimensions, rough surface, heat treatment and electroplating and other surface treatment processes are not reasonable, improper assembly, poor storage and use environment and improper operation and use will cause Contact and mating parts cause poor contact.

Poor insulation

The role of the insulator is to keep the contacts in the correct position and to insulate the contacts and the contacts, and the contacts and the housing from each other. Therefore, the insulation must have excellent electrical properties, mechanical properties and process forming properties. Especially with the widespread use of high-density, miniaturized terminal blocks, the effective wall thickness of insulators is getting thinner and thinner. This imposes more stringent requirements on insulation materials, injection mold accuracy and molding processes. Due to the presence of excess metal on the surface or inside of the insulator, surface dust, flux and other pollution and moisture, organic material precipitates and harmful gas adsorption membranes fused with the surface water film to form ionic conductive channels, moisture absorption, mold growth, aging of insulation materials, etc. Will cause short circuit, leakage, breakdown, low insulation resistance and other poor insulation phenomena.

3. Poor fixation

The insulator not only plays the role of insulation, but also usually provides accurate centering and protection for the protruding contacts. At the same time, it also has the functions of installation and positioning, and locking and fixing on the device. Poor fixation, minor impact on the reliability of the contact caused an instant power failure, the most serious is the product disintegration. Disintegration refers to the abnormal separation of the plug and socket, the pin and the jack caused by the unreliable structure of the terminal in the mated state due to materials, design, and technology, which will cause the control system to transmit power and Serious consequences of signal control interruptions. Due to unreliable design, wrong selection of materials, improper selection of molding process, poor quality of heat treatment, mold, assembly, welding, etc., and poor assembly will cause poor fixing.

In addition, the appearance is not good due to peeling, corrosion, bumps, flashing of the plastic shell, cracking, rough processing of contacts, deformation, etc., due to the poor positioning and locking fit, poor processing quality consistency, and excessive total separation force. Poor interchange caused by other reasons is also a common disease and frequently-occurring. These kinds of failures can generally be found and eliminated in time during inspection and use.