Terminal Blocks: [ Ссылка ]
In today’s video we want to take another look at terminal blocks. We have several other videos that focus on terminal blocks and cover a wider variety of topics. If you have not already seen any of those videos, we encourage you to go back and watch them as we talk about the many different types, uses and functions of terminal blocks. For the purpose of today's video, I want to discuss a few of the most common types of terminal blocks, and focus on the different scenarios that we use each unique style of terminal block in. The terminal blocks in which we will discuss are, fuse blocks, single level pass through blocks, and multi level terminal blocks.
While it would be possible to use any of these types of terminal blocks in many different scenarios, it may not make sense to use them in certain situations, even if they can get the job done. For example, while a multi level terminal block can be used to distribute power, it may not be necessary to have more than one terminal available to properly perform that specific task. Using a multi level terminal block would not be necessary or cost effective. So let’s look at a few different areas where each of the terminal blocks we have mentioned would make the most sense. Keep in mind, this is just one method that we use, but there are many different approaches that can taken to achieve the same result.
When looking at power distribution, there are a few different types of terminal blocks that we commonly use. The first is a fused terminal block. The reason a fused block makes sense in this application is because it can give you the ability to limit the amount of current that passes through it, protecting any devices downstream of that particular terminal block. Better yet, if a fused terminal block is used that also has the ability to be disconnected, it then gives you even more ability to control the power coming from that terminal block.
Single level pass through terminal blocks are also commonly used to distribute power throughout a control panel. However, without the ability to provide any fused protection, the pass through terminal block is most commonly used as a junction point. You commonly see this when wiring AC neutral wires, or AC “Hot” wires that are not fused. These single level blocks can allow for a very clean method to distribute power to multiple locations throughout a control panel. Single level pass through blocks can also be used anywhere a junction point is required, not just in power distribution. So… it is common to see them being used in control signals where a junction might be necessary.
Now let's look at multi level terminal blocks and applications where they might make the most sense. One big advantage to using multi level terminal blocks is the ability they give you to save space when there are a lot a terminations that may be required. In some cases, a multi level terminal block can accommodate three separate circuits in the same amount of space that a single level terminal block could be used. For example, when wiring an analog signal to a PLC, the multi level terminal block could be used for outgoing power to the instrument, return DC, and instrument signal levels…. All in one terminal block. This ability provides great versatility and flexibility when designing industrial control panels.
As you can see, there are many different areas where different types of terminal blocks can be used, but it is best to try to fit the style of terminal block you are using to the applications that will both maximize the use of the terminal block, while not providing more function that is absolutely necessary.
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