INTERCONNECTION
Interconnection - the “Humble” PCB Terminal Block
There are multiple well-known and well-documented industry- standard connector types offering reliable electrical interconnection for electronic systems. This article addresses the often-overlooked PCB Terminal Block, a relatively simple component, but nonetheless a vital component that can adversely affect electronic system reliability and make maintenance harder.
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CB Terminal Blocks, also known as PCB terminal strips and PCB connector blocks, are electrical connectors providing a reliable, safe, effective way of joining or terminating wires, allowing easy access for repairs and upgrades.
PCB Terminal blocks are used in a wide range of applications, from industrial control systems to home automation products. For example, industrial control panels use terminal blocks to connect switches, LED lamps, sensors, and other components within the system. In addition, terminal blocks can connect power cables to the control system.
Types of PCB Terminal Blocks PCB Terminal Blocks come in a variety of sizes, shapes, materials, and colours to suit the specific needs of the application. Different types range from a simple two-pole connection to complex multi-pole connection. High-quality terminal blocks are manufactured from durable materials that are resistant to high temperatures, shock, and vibration. They need to be designed to withstand even the harshest environments, ensuring reliable and long-lasting performance.
A good example is the wide range of PCB Terminal Blocks available through BEC Distribution. The range covers the most common types: Standard PCB terminal blocks are the typical wire-to-board connection method, soldered to the board at one end by the pins and the wire entry is on a separate face, horizontal or vertical to the PCB. Pluggable terminal blocks create more opportunities for terminal blocks to become more flexible connectors. The receptacle is soldered to the PCB like a standard PCB terminal block, which then creates a header for the plug side of the connector to be connected to. Modular terminal blocks consist of multiple
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terminal blocks that can be combined to create custom configurations. They are often used in complex control systems and power distribution panels. Rising clamp PCB terminal blocks provide excellent repeatable clamping performance. They can accept a wide range of wire sizes both solid and stranded, with or without ferrules. Wire protection terminal blocks offer screw termination and high levels of physical protection, utilising wire protector terminals. DIN Rail terminal blocks connect wires together on a DIN rail system. A typical DIN system will use pluggable connection blocks with screw connections. Turret Style Double Row terminal blocks are a valuable finger-safe option. They are commonly available with 2, 4, or 6 positions. 250V, 25A, with a typical 7.5mm pitch. This type of block is especially suited for HVAC and other similar control voltage applications. High-Power terminal blocks meet the demand for high current and high voltage ratings, often up to 400A at 600V or even greater. A wide range of terminations is required for High-Power applications, including screw terminals, studs, and screw clamps.
The Benefits of Terminal Blocks PCB terminal blocks offer many benefits connectors, including: Safe and Secure Connections: A secure
DECEMBER/JANUARY 2024 | ELECTRONICS FOR ENGINEERS
way to connect wires, preventing the wires from coming loose or contacting each other, potentially damaging electronic components on the PCB.
Easy Maintenance: Terminal blocks are designed for easy maintenance, product upgrade and repair. Wires can be easily removed and replaced, with no need for soldering or any other specialised tools.
Aspects to consider when choosing a PCB Terminal Block
Wire Size: It is important to select a terminal block suitable for the wire size in the application to guarantee a safe, secure, and reliable connections. Voltage and Current Rating: It is essential to choose a terminal block rated for the voltage and current of the application circuit. Maintenance, Repair and Upgrade: It is vital to consider ease of maintenance and repair, including access to the block, enabling easy disconnection and replacement of wires.
Cost-effective Sourcing of High- quality PCB Terminal Blocks
BEC Distribution has put together its “Select” range of quality alternative passives, aiming to provide quality, value-for-money products available on short lead times. Extremely high reliability has been the main goal, combining cost-effectiveness with high quality.
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