How to purchase suitable terminal blocks

How to purchase suitable terminal blocks
First of all, we should explore our own needs, what aspects we care most about when we buy terminals, and what problems we hope terminals can solve for you. This is the most important.
For example, if there are requirements for the purpose and application of terminals, you can purchase appropriate types of terminal blocks, such as grounding, power distribution, or other special applications.
Of course, whether special types of terminal blocks are needed, whether they need to follow the guide rail, what type of track is applicable, what is the final market or end application of the product, and whether product certification is required in relevant markets, such as UL, VDE, CE, RoHS, etc.
Secondly, understand the parameters and specifications of common terminal blocks. In this respect, you can learn from terminal type, rated current/current, spacing, wiring range, etc., such as
1. Terminal type. According to the functional classification of terminals, there are ordinary terminals, safety terminals, test terminals, grounding terminals, double-layer terminals, double-layer conductive terminals, three-layer conductive terminals, one-in and two-out terminals, one-in and three-out terminals, double-in and two-out terminals, circuit breaker terminals, overvoltage protection terminals, logo terminals, etc. According to current classification, it can be divided into ordinary terminals (small current terminals) and large current terminals (more than 100A or more than 25MM lines). Classified by appearance. It can be divided into track terminal, fixed terminal, circuit board terminal (PCB terminal), etc.
2. Rated current: common rated current is 10A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 100A, 150A, 200A, 300A, 400A, etc.
3. Rated voltage: common rated voltage includes 150V, 300V, 600V, or 601V~1500V.
4. Spacing: common terminal spacing is 3.50mm, 3.81mm, 5.00mm, 5.08mm, 7.50mm, 7.62mm, etc.
5. For different terminals, their size and wiring range are different. Generally, when using terminals, it is better to select a wiring range slightly larger than the actual wire diameter. Because the current standards on the market are relatively chaotic, if you choose the wiring aperture with the same size as the wire diameter, the wiring range may be reduced and the wire cannot be inserted into the pressure frame because the terminals produced on the market do not meet the standards.
Finally, different terminals can be selected for different space sizes. For example, you can choose double-layer terminal or three-layer terminal in a narrow space.