- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
Views: 88 Author: Site Editor Publish Time: 2025-08-05 Origin: Site
PCB terminal blocks are a vital electronic components in many electronic applications systems, allowing secure and reliable connections between printed circuit pcb boards and external wires. These terminal blocks are available in a variety of sizes, types, and materials to meet the specific needs of different applications, and are commonly used in industries such as automotive, telecommunications, and PLC control systems,Lighting,home appliance,etc. However, like any electrical component, terminal blocks can also be subject to certain issues and limitations that must be considered to ensure their proper functioning.
Table of Contents
The Ultimate Guides To PLC Terminal Blocks for Flawless Wiring |
PCB terminal block-electrical connector
PCB terminal block is a specialized electrical connector designed to facilitate the connection of wires to a printed circuit board. It typically consists of a plastic housing with multiple metal contacts arranged in a row, with screw terminals or other clamping mechanisms to secure the wires in place.
The terminal block allows for a secure and reliable connection between the PCB and external wires, while also providing a convenient way to make changes or repairs to the wiring without requiring soldering or other specialized tools. Overall, a PCB terminal block serves as a vital electronic component in many electronic systems, providing a flexible and efficient means of connecting and managing electrical signals.
Different types of PCB terminal blocks
There are several different types of PCB terminal blocks, each with unique characteristics and uses.
1.screw terminal block, which uses screws to clamp down on the wires and hold them in place.
2.spring terminal block, which uses a spring mechanism to secure the wires.
3. barrier strip terminal block, which has a plastic barrier to prevent accidental short circuit.
4. pluggable terminal block, which allows for easy removal and replacement of wires without the need for tools.
5.Din rail terminal block.Each type of terminal block has its own strengths and weaknesses, and the choice of which type to use will depend on the specific requirements of the application.
Purpose and application of the PCB terminals blocks 
A PCB terminal block is primarily used to securely and conveniently connect wires to a printed circuit board. It provides a reliable and efficient means of making electrical connections in a wide range of electronic applications, including power supplies, control systems, automation equipment, and telecommunications devices.
The use of terminal blocks simplifies the wiring process, allowing for easy maintenance, repair, and modification of electronic circuits. In addition to connecting wires to the PCB, terminal blocks may also be used to bridge connections between different sections of the circuit, and to provide a means of grounding or isolating components. Overall, the versatility and convenience of PCB terminal blocks make them an essential component in many electronic systems.
Difference between terminal block and junction block
While both terminal blocks and junction blocks are used in electrical applications, they serve different purposes and have distinct features.
A terminal block is an electrical connector used to securely connect wires to a printed circuit PCB Board. It typically consists of a plastic or metal housing with metal contacts arranged in a row, with screw terminals or clamps to hold the wires in place. Terminal blocks are used to provide a secure and reliable connection between the PCB and external wires.
A junction block, on the other hand, is a type of distribution block used to connect multiple wires together. It is often used in automotive applications to connect different components of the electrical system, such as the battery, alternator, and starter. Junction blocks typically have multiple terminals or studs to connect the wires, and may also include fuses or other protective devices.
In summary, while both terminal blocks and junction blocks are used to make electrical connections, a terminal block is used to connect wires to a PCB, while a junction block is used to connect multiple wires together within a larger electrical system.
Material of PCB terminal block
Nylon (PA6, PA66) | High mechanical strength, good chemical resistance, cost-effective | -40°C to +105°C (PA6) | UL 94 V-2 (Flammability) | General-purpose electronics, low-cost applications | Limited heat resistance, absorbs moisture |
Polyamide (PA) | Superior heat resistance, excellent durability | -40°C to +130°C (short-term +150°C) | UL 94 V-0 (Flame-retardant) | Automotive, industrial controls | Higher cost than standard nylon |
Polycarbonate (PC) | High impact resistance, transparent , | -40°C to +125°C | UL 94 V-0 / HB | Safety-critical applications, enclosures | Prone to stress cracking with some some chemicals |
PBT (Polybutylene Terephthalate) | Excellent electrical insulation, low moisture absorption | -40°C to +140°C | UL 94 V-0 | High-temperature circuits, relays | Brittle at very low temperatures |
Thermoset Plastics (Phenolic, Bakelite) | Extreme heat resistance, rigid structure | Up to +200°C | UL 94 V-0 | High-power applications, heavy industry | Less flexible, higher cost |
Ceramic | Ultra-high temperature resistance, non-flammable | Up to +1000°C | N/A (Inherently insulating) | Aerospace, high-voltage systems | Fragile, expensive, difficult to machine |
Metal Contacts (Brass, Copper, Steel) | High conductivity, corrosion-resistant plating (tin, gold, silver) | Varies by plating: | N/A (Conductive) | High-current paths, signal integrity | Requires insulation housing |
PCB terminal blocks are typically made of insulating materials such as plastics, including nylon, polyamide, and polycarbonate. These materials provide a high degree of mechanical stability, electrical insulation, and resistance to heat and chemicals, making them well-suited for use in a wide range of electronic applications.
In addition, some terminal blocks may have metal components, such as the clamping mechanism or contact points, which are typically made of materials such as brass, copper, or steel. These materials provide good electrical conductivity and durability, ensuring reliable and long-lasting performance of the PCB terminal block.
Overall, the choice of materials used in the construction of PCB terminal blocks will depend on the specific requirements of the application, such as the desired level of electrical insulation, mechanical strength, and resistance to environmental factors such as temperature, moisture, and chemicals.
this is small current terminal block,
10A/20A terminal block
High current spring terminal block
The maximum current carrying capacity of a terminal block can vary depending on the specific type and model, as well as the wire gauge and insulation used in the application. some terminal blocks are rated for 3A, 5A, 10A, 20A, 30A, 40A, 60A, or even higher like 150A or 280A,300A .In general, terminal blocks can typically handle currents ranging from a few amps up to several hundred amps, depending on the size and construction of the block. For example, a small terminal block designed for use with low voltage or signal level circuits may have a maximum current rating of only a few amps, while a larger terminal block designed for high power applications may be rated for currents of several hundred amps or more.
It is important to ensure that the PCB terminal block is selected based on the specific requirements of the application, and that the maximum current rating is not exceeded to prevent overheating, damage, or other safety issues.
Standard size of PCB terminal block
There is no universal standard size for PCB terminal blocks, as they come in a wide range of sizes and configurations to meet the specific requirements of different applications. The size of a terminal block can depend on factors such as the number of terminals or connections required, the wire gauge and insulation used in the application, and the available space on the printed circuit board. 
That being said, some common sizes for PCB terminal blocks are 5.0mm, 5.08mm, 7.5mm, and 7.62mm pitch. Pitch refers to the distance between the center of each terminal, and these sizes are commonly used in applications such as control systems, power supplies, and telecommunications equipment.
In addition to the pitch, other dimensions of a terminal block such as height, width, and length can also vary depending on the specific model and manufacturer. It is important to choose a terminal block that fits the available space on the PCB and meets the electrical and mechanical requirements of the application.
One of the most common issues with PCB terminal blocks is poor or unreliable electrical contact between the wire and the terminal contact. This occur due to a variety of factors, such as improper tightening of the screw or clamp, corrosion or oxidation of the contact surface, or damage to the wire insulation. Poor contact can result in a range of problems, including intermittent electrical connections, increased resistance, or even complete circuit failure.
In addition, excessive heat or vibration can also cause the terminal block to loosen over time, leading to further contact problems. To address these issues, it is important to ensure that the terminal block is properly installed and tightened, and that the wire contacts are clean and free of damage or corrosion. Regular inspection and maintenance can also help to prevent contact problems and ensure reliable performance of the terminal block over time.
PCB terminal blocks are an essential element in the world of electronics, providing reliable and secure connections between printed circuit boards and external wires. By selecting the right type, size, and material for the specific application, and by following proper installation and maintenance procedures, users can ensure that terminal blocks function properly and deliver the performance needed for their electronic systems.
· Compact design: High levels of connection convenience and numerous possible applications with small PCB terminal block dimensions
· Easy integration into the device front: Cost-effective panel feed-throughs with a uniform design and termination flush with the housing
· Process-optimized packaging: Reduced production times and process costs with tape-and-reel, tube, and tray packaging optimized for automatic machines
· Multi-row arrangement: Versions with angled conductor outlet enable a high connection density on the PCB
· Integrated test points: Take measurements conveniently without removing the wiring or other accessories
Shanghai Shanye Electronics Co ;Ltd(KEFA ELECTRONICS 's branch)is one top terminal blocks manufacturer, who can provide all the services including ODM/OEM ,customized ,according to your customers 's requests.
FAQ
Q:What is a PCB terminal block?
A:PCB terminal block enable the easy and safe transmission of signals, data, and power to the PCB. They are suitable for a variety of applications in numerous industries, markets, and for Industry 4.0 applications.
Q:What are the different types of PCB terminal blocks?
A:1. Pluggable terminal block
2. Screw terminal
3. Spring type terminal
4. Barrier terminal block
5. Feed-through terminal block
6. Din rail mount terminal block
Q:What material is PCB terminal block?
A:Insulating materials made of thermoplastics such as polyamide (PA66) or polycarbonate (PC) are easy to process.Includes LCP material with very high quality . Terminal blocks consisting of an insulating material such as polyamide or polycarbonate are used in almost every industry.
Q:What is a terminal block circuit?
A:terminal block circuit is a type of electrical connector used to securely join two or more wires together, often within a larger electrical system. They provide a safe, organized, and often modular way to connect wires, facilitating both power distribution and signal routing.
Q:What is a terminal barrier block?
A:Barrier strip terminal blocks, often simply called barrier strips, are insulated strips equipped with screw terminals for connecting wires. Each terminal sits within a separate compartment, insulated from its neighbors by plastic barriers
Q:What is the difference between a terminal block and a junction block?
A: terminal block and a junction block, while both used for electrical connections, serve different purposes and have distinct designs. Terminal blocks are primarily used for organizing and securing multiple wire connections within a single unit, often found in control panels and automation systems where structured, stable terminations are needed. Junction blocks, on the other hand, are typically used for splicing wires and creating more flexible, often temporary, connection points, commonly found in general electrical circuits and lighting system
