2~12-Way Terminal Strip Function and Selection

Classification of terminal strip: jumper type, electrical type, control panel, din rail, block, barrier, power distribution, breadboard, junction box, autocad electrical, marine, solder, rs485, automotive, drawing, eplan, hvac, pcb, robocop, dual row, aircraft, busbar, ground, panel mount, dimensions, spade, circuit, common terminal strip.

Combined PT spring terminal block

Selection of terminal blocks

Application of terminal block

terminal strip means an insulating component that carries multiple or groups of terminal assemblies that are insulated from each other and is used to fix the support. The function of the terminal strip is to connect the lines of the equipment inside the screen and the equipment outside the screen, and play the role of signal (current and voltage) transmission. The terminal strip makes the wiring beautiful and easy to maintain. The connection between long-distance lines is mainly reliable and easy to construct and maintain.

Terminal strip definition
One wiring position of the terminal strip is 1 “position”. Usually, these serial numbers have different definitions in different applications.
“Jie” and “position” have the same meaning, they just have different names. “Group” is composed of “sections”.
Common terminals include 2-bit, 3-bit, 4-bit, 6-bit, 12-bit, etc., which are divided according to quantity. According to capacity, there are: 10A, 20A, 40A, etc.
Those marked U, V, and W are generally the terminal blocks of three-phase motors.

Terminal strip standards
This standard is equivalent to the international standard IEC455 (1988) “General principles for the identification and application of alphanumeric systems for equipment terminal blocks and specific conductor terminals”.

Applicable scope of terminal strip
This standard specifies various methods for identifying terminal blocks of electrical equipment (hereinafter referred to as equipment). and established general rules for the identification of equipment terminal blocks and specific conductor terminals by an alphanumeric system.
This standard applies to the identification marking of terminal blocks of equipment (such as resistors, fuses, relays, contactors, transformers, rotating electrical machines, etc.) and combinations of these equipment, and also applies to the identification of specific wire ends.

How to identify the terminal strip
Equipment terminal blocks and specific wire ends can be identified using one or more of the following methods.
1. Adopt the relevant product marking system to determine and identify the actual or relative location of equipment terminals or specific wire ends.
2. Use the relevant product marking system to determine and identify the color markings of equipment terminal blocks and specific wire ends.
3. Use the graphic symbols specified in GB5465. If auxiliary symbols need to be used, they should be consistent with the graphics in GB4728.
4. Use the alphanumeric symbols specified in Chapter 5 of this standard.
application
Colors, graphic symbols or alphanumeric symbols shall be marked at or adjacent to the corresponding line ends.
When more than two identification methods are used and confusion is likely to occur, the relationship between the two identification methods must be stated in the relevant documents.

TB terminal block

ST terminal block

Through type terminal block

The basic principle
1 The alphanumeric system consists of uppercase Latin letters and Arabic numerals.
2. The letters marking DC components are selected from the first half of the alphabet, A to M, and the letters marking AC components are selected from the second half of the alphabet, N to Z.
The letters “I” and “O” cannot be used, but the symbols “+” and “-” can be used.
3 The omission of certain parts of the complete alphanumeric symbols specified in Article 5.2 is permitted when confusion is not caused.

Marking principles for terminal strips
Terminal marking is based on the following principles:
1. The two terminals of a single component are distinguished by two consecutive numbers. Odd numbers should be smaller than even numbers, such as 1 and 2.
2. The middle terminals of a single component are distinguished by numbers. It is best to use numbers in natural increasing order. For example: 3, 4, 5, etc. The numbers of each terminal in the middle should be larger than those of the terminals on both sides, and should be marked starting from the terminal close to the smaller number. For example, the middle terminals of a component with terminals 1 and 2 on both sides are marked with numbers such as 3, 4, 5, etc.
Two side terminals and two middle terminals
3. If several similar components are combined into a group, the terminals of each component can be marked with the following methods:
a. The numbers specified in 5.2.1 and 5.2.2 are preceded by letters to distinguish the terminals on both sides and the terminals in the middle, for example:
Use U, V, and W to mark each phase terminal of the equipment in the three-phase AC system;
b. When it is not necessary or impossible to identify the phase, the terminals on both sides and the terminals in the middle are distinguished by numbers before the numbers specified in Articles 5.2.1 and 5.2.2. To avoid confusion, add a dot between these numbers, for example: the terminals of one component are marked with 1.1 and 1.2, and the terminals of another component are marked with 2.1 and 2.2;
c. The two terminals of each component are distinguished by different consecutive numbers. The odd number of the component should be smaller than the even number.
Identification of specific wire ends
The alphanumeric identification of specific conductor terminals shall be as specified in Table 1.
Table 1 Marking of equipment-specific terminal blocks and identification of specific conductor ends