Terminal block is a device used to fix and connect wires, usually used in electrical equipment, control panel, distribution cabinet and other electrical facilities. Its role is to allow the current to flow properly by reliably fixing the wire, while being able to easily connect and disconnect.
The selection of terminal blocks needs to be considered according to different use scenarios and needs. The following are some basic knowledge and selection:
Wiring terminal blocks are usually made of metal and plastic. Metal terminal block has good electrical conductivity and mechanical strength, which is suitable for occasions requiring high current transmission; plastic terminal block has good insulation properties and corrosion resistance, suitable for general low current transmission.
The current capacity of the terminal block needs to be selected according to the actual use of current. In general, the larger the current, the larger the cross-sectional area and material of the terminal wire need to be selected. If the current exceeds the rated current capacity, it may lead to poor contact, heating, burning and other problems.
The rated voltage of terminal block should match the actual voltage used, otherwise it may lead to safety problems such as arc and breakdown.
The reliability is one of the indicators that need to considered when selecting, terminal block should be able to use for a long time,humidity, high temperature and other harsh environments maintain stable electrical conductivity and mechanical strength, to prevent poor contact, fracture and other problems.
The installation methods include plug type and fixed. The plug-and-pull terminal block is suitable for occasions where frequent connection and disconnection are required, while the fixed terminal block is suitable for occasions where long-term fixed wires are required.
The wire interface of the terminal block should be able to adapt to different specifications of wire. In general, the larger the cross-sectional area of the wire, the larger the wire interface of the terminal block also needs to be.
The electrical contact performance of the terminal includes contacts resistance, contact area, etc. The contact resistance should be as small as possible to ensure that the current can pass smoothly; the contact area should be as large as possible to ensure reliable contact.
The insulation performance of the terminal block refers to that it can maintain good insulation performance under a certain voltage to prevent current leakage and breakdown.
The protection level of the terminal block indicated the degree of protection it can support. In different environments, it may be necessary to choose terminal blocks with different levels of protection to ensure the reliability of electrical connections.
In short, the selection of the appropriate terminal block need to consider a number of factors according to the actual needs, including material, current capacity, rated voltage, reliability, installation method, wire cross-sectional area, electrical contact performance, insulation performance and protection level. Only by selecting the appropriate terminal block can we ensure the normal operation safe using of electrical equipment.
