What are the important applications of din rail mounted terminal blocks?
Terminal Blocks also referred to as screw terminals or connection terminals, are insulated and modular sections that consist of a clamping component and an insulating frame that combine two or more wires together. DIN rails mounted terminal blocks are adjustable that enables wiring to be centralized and helps to handle complicated control circuits. These days, the control wiring solutions are increasingly becoming more and more intricate because the equipment is restricted to smaller and smaller spaces, and the sector needs more reaction and greater automation.
Terminal blocks can be easily removed or added from the rail without interrupting other wire terminations when modifications are made in the circuit. Moreover, reducing the difficulty of control wiring, terminal blocks’ plastic frames defend against shorts and afterward offer an enhanced level of security to service crews and installer.
Based on the characteristics like panel mounting process, approvals, standards, and design, the terminal blocks are grouped as DIN (IEC) and NEMA. DIN kind rails are the IEC terminal blocks, which were established in Europe. It defines the channel or rail that the terminal block is held to. The design of termination blocks offers more terminations per linear foot, that suits industry needs to boost the number of terminations in a control panel. The IEC blocks can be easily attached, wired and marked as compared to NEMA style blocks. Rails are available in different sizes (15, 32, and 35) mm widths. DIN blocks are highly compatible for manufacturers as the rail is standard and can be modified to handle the huge range of applications.
In the U.S., almost 60 % of the terminal blocks used are DIN type. Most designers recommend DIN rail mounted terminal blocks because they are small in size, compact designs, consume less space and more units per foot. NEMA terminal blocks are known as American-style, having pressure plates (self-lifting), box lug connectors and binder head screws. This type of terminal blocks is more commonly used for heavy-duty operations. Also, NEMA blocks offer fewer terminations/linear foot and consume more panel space. Also, rail sizes vary across makers, restricting the user’s selection
NEMA terminal blocks are cost-effective for some applications and have an open construction that allows for easier wiring. More options are available for high current applications. While choosing the right type of terminal blocks, first of all, measure the voltage, current and wire size to be used for the individual wire runs in the power distribution application. If is there any special space constraints forced by the application, keep that in mind before buying the right terminal block. Consider the block widths and if necessary to meet space requirements, just double the wire size and block level.
While selecting, determine how many blocks or number of poles are required, whether any blocks need to be jumped and in what way the jumper connections should be developed. Choose the special function block such as ground, fuse, switch, disconnect, indicating types etc. depending upon the application requirements.