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PCB Screw Terminal Block

What is PCB Screw Terminal Block

 

PCB screw terminal blocks 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.

 

Benefits of PCB Screw Terminal Block

 

 

Reduce Space
By investing in multi-level PCB screw terminal blocks you can reduce panel space by up to 50%. That's because the multi-level blocks contain multiple levels of circuits with that single block.

 

Increase Safety
PCB screw terminal blocks increase safety by grounding, isolating, and protecting the other components in the electrical circuit. PCB screw terminal blocks are available with finger-safe connections to prevent electrical shock.
And, PCB screw terminal blocks can also provide test points, which add even more safety to the circuit.

 

Easy Installation
They can then be installed using a screwdriver. They also ensure fast connection/disconnection which helps with both maintenance and troubleshooting.
With electrical power, the electrical terminal block is used to connect electrical switches and outlets to the mains.

 

Made of Copper Alloy
Most terminal bodies consist of a copper alloy that uses the same expansion coefficient as the wire intended for use. Using the same expansion coefficient helps prevent loosening due to differing expansion rates.
It also reduces corrosion which is caused by electrolytic action between two different metals.

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Why Choose us

 

 

Quality Assurance

We have obtained UL, CE, ROHS, ISO9001 certificates. Selling well in all cities and provinces around China, or products are also exported to clients in such countries and regions as USA, Germany, France, Italy. We also welcome OEM & ODM orders.

 

Customer service

The company offers excellent customer service and support, making it easy for customers to resolve any issues they may have with the product.

 

Rich Experience

Our company has many years of production work experience. The concept of customer-oriented and win-win cooperation makes the company more mature and stronger.

 

 

PCB Screw Terminal Block Classification

 

Pluggable terminal blocks
The plug-in terminal blocks have needle pitches of 3.50 mm, 3.81 mm, 5.00 mm, 5.08 mm, and 7.62 mm, with a number of digits of 02-24p. Sockets fixed with screws can be provided for matching and seismic connection. The plug uses side to side connection technology, which means that the screw direction and the wire incoming direction are straight.

 

PCB screw terminal blocks
The structure and planning of PCB screw terminal blocks have strengthened the features of convenient wiring and reliable screw connection; Compact structure, reliable links, with its own advantages; Utilize the lifting principle of the wire clamp body to ensure reliable wiring and large wiring capacity; The welding leg and the wire clamp body are divided into two parts to ensure that the distance when tightening the screw does not transfer to the welding spot and damage the welding spot; Robust and reliable housing, needle pitch.

 

Spring type printed circuit board terminals
Spring type printed circuit board terminals have needle pitches of 2.50 mm, 3.50 mm, 5.00 mm, 7.50 mm, 7.62 mm, etc. Single core wires can be inserted directly without the assistance of a handle, but smaller wires can be clamped by opening the clip with a handle; There is no button standard, making it possible to significantly reduce the height. When retracting the wire, it is easy to remove the wire by pressing it down with a screwdriver; Most spring type terminals are assembled one by one; Wiring methods are extremely suitable for use in communication systems, lighting systems, monitoring systems, and building wiring; Various wiring directions are advantageous for assembly in a narrow space, with arbitrary combination of contact numbers and convenient operation, suitable for high-density wiring requirements.

 

Fence type terminal blocks
Fence type terminal blocks are designed for power applications and incorporate a flip over type clear safety cover. Barrier wire ends that can allow for clutter or wear to prevent electrical short circuits between the orientation of the same terminal block and adjacent components. It can achieve safe, reliable, and effective connection, especially in the application environment of large current and high voltage, which is widely used.
Fence type terminals are interconnections that contain metal straps and connectors or screws that allow for wire termination and bonding.

 

SCREW TYPE CONNECTOR FOR PCB

 

What Are The Production Materials Of Pcb Screw Terminal Blocks?

The common production materials of PCB screw terminal blocks


Thermosetting plastic EP
Thermosetting plastic EP has good geometric stability, low water absorption, and very high flame retardancy. When the temperature increases, the stability is superior to that of thermoplastics, but the toughness is poor.

 

Glass fiber reinforced nylon PA-F
Glass fiber reinforced nylon has strong rigidity and hardness, and its use temperature is higher than that of non-reinforced nylon. Therefore, it is also suitable for the field of overvoltage protection. Reinforced nylon absorbs less water than non-reinforced nylon.
Apart from the above differences, the other properties of the two materials are the same. According to UL94, the flame retardant grade of fiber-reinforced nylon is HB to V0, where V0 type materials are dyed black in most cases;

 

Thermoplastic polycarbonate PC
Thermoplastic polycarbonate PC has high hardness, good impact toughness, transparency, dimensional stability, good insulation properties, and good thermal stability. Transparent polycarbonate is particularly suitable as a cover or identification material.
Polycarbonate is stable against erosion by mineral acids, saturated fatty carbohydrates, gasoline, lipids and oils. Polycarbonate is less resistant to solvents, acetone and ammonia. Stress cracks may form when in contact with certain chemicals;

 

Thermoplastic polyester PBT
PBT has good geometric stability. The glass fiber reinforced material has high strength and heat resistance. It also has reliable flame retardancy and excellent electrical properties.

 

Thermoplastic nylon 6.6
There are high requirements for the quality of the insulated housing of the combined terminal. Most of them are made of thermoplastic nylon 6.6. This plastic can be economically processed by injection molding. It is harmless to the environment and conducive to recycling .
PCB screw terminal blocks, connectors, and busbars are made of electrolytic copper (H65) as the basic material. Copper has excellent electrical conductivity as compared to silver.
Because the wires connected to the terminals are all copper materials, the same material and the same expansion coefficient will not cause the problem of loose connections.

 

Uses of PCB Screw Terminal Blocks

Control Panels

PCB screw terminal blocks are often used in control panels for connecting sensors, switches, and other components to the control system. They can also be used to connect power cables to the control panel.

Building Wiring

PCB screw terminal blocks are commonly used in building wiring for connecting electrical cables to light fixtures, outlets, and switches. They can also be used to create branch circuits and to connect multiple wires together.

Power Distribution

PCB screw terminal blocks are used in power distribution systems for connecting power cables to distribution panels and switchgear. They are also used for connecting transformer windings and for creating multiple power taps from a single source.

 

Tips for Properly Installing and Using PCB Screw Terminal Blocks

 

Choose the Right PCB Screw Terminal Block
Selecting the appropriate PCB screw terminal block for your application is crucial. Factors to consider include the current and voltage ratings, wire size compatibility, and the number of connections required. Consult the datasheet provided by your PCB screw terminal block supplier to ensure that the chosen component meets your project's specifications.

 

Prepare Your PCB
Properly preparing your PCB is essential before installing screw terminal blocks. Ensure that the PCB has the necessary holes or pads for mounting the terminal blocks. These holes should align with the positions of the terminals to guarantee a secure fit.

 

Strip Wires to the Correct Length
Before inserting wires into the PCB screw terminal blocks, strip them to the correct length. The exposed wire should be just long enough to fit snugly within the terminal without extending beyond it. Excessive exposed wire can lead to unintended short circuits or poor connections.

 

Tighten Screws Appropriately
When inserting wires into the terminal blocks, it's crucial to tighten the screws appropriately. Over-tightening can damage the wire or the terminal, while under-tightening can result in loose connections. Follow the manufacturer's recommendations for torque values to ensure a secure and reliable connection.

 

Organize and Label
Maintaining proper organization is vital when working with PCB screw terminal blocks. Consider using labels or color-coding to identify wires and connections. This practice will make troubleshooting and future maintenance much more manageable.

 

Follow Polarity and Orientation
Pay attention to the polarity and orientation of your connections. Some PCB screw terminal blocks are designed for specific polarities, and reversing the connection can lead to circuit malfunction or damage. Always double-check the documentation or markings on the terminal block to ensure correct orientation.

 

Consider Environmental Factors
Think about the environment in which your PCB and screw terminal blocks will operate. If your application is exposed to harsh conditions such as moisture, dust, or extreme temperatures, opt for terminal blocks with suitable protection, such as IP ratings or specialized coatings.

 

Regular Maintenance
Regular maintenance is crucial to ensure the longevity and reliability of your PCB screw terminal block connections. Periodically inspect the connections for signs of wear, corrosion, or loose screws. Address any issues promptly to prevent potential failures.

 

Seek Expert Advice
If you're unsure about the installation or usage of PCB screw terminal blocks, don't hesitate to seek expert advice. Consult with your supplier or reach out to experienced professionals in the field. It's better to ask questions and ensure proper installation than to risk costly mistakes.

 

 

ConsiderationsWhen Selecting and Installing PCB Screw Terminal Blocks

Wire Size: PCB screw terminal blocks are designed for specific wire sizes. It is important to select a PCB screw terminal block that is suitable for the wire size being used, to ensure a secure and safe connection.

 

Voltage and Current Rating: PCB screw terminal blocks are rated for specific voltage and current levels. It is important to select a PCB screw terminal block that is rated for the voltage and current of the circuit being used.

 

Environmental Factors: When selecting PCB screw terminal blocks, it is important to consider the environmental factors in which they will be used. Factors such as temperature, humidity, and exposure to chemicals or other hazards can affect the performance of the PCB screw terminal block.

 

Installation Requirements: PCB screw terminal blocks must be installed correctly to ensure safe and reliable operation. This includes proper mounting, wire routing, and torque values for the screws or clamps.

 

Maintenance and Repair: It is crucial to consider the ease of maintenance and repair when selecting PCB screw terminal blocks. This includes factors such as access to the PCB screw terminal block, ease of removing and replacing wires, and availability of replacement parts.

PCB SCREW TYPE TERMINAL BLOCK FOR CONNECTION

 

Our Factory

 

Zhejiang Deerkesi Electrical Co.,Ltd was established in 2006, which is a professional manufacturer of terminal blocks integrating R&D, design, production and sales. The company mainly produces PCB terminal blocks, screw terminal blocks, plug-in terminal blocks, and spring-type terminal blocks. Through unremitting efforts, the company has rich experience in manufacturing terminal blocks, complete professional production equipment, strict quality control procedures, perfect sales network, and extensive product application examples.

 

 
Asked Questions
 

 

Q: What is a PCB screw terminal block?

A: A PCB screw terminal block consists of a modular housing with an insulated body that secures two or more wires together. PCB screw terminal blocks—also referred to as terminal connectors, connection terminals, or screw terminals—are used in a wide array of applications where electrical systems need to be safely connected. They are ideal for designs requiring secure, well-organized, and semi-permanent wire connections that can be easily swapped out for inspection or repair in the field.

Q: What are PCB screw terminal block connectors?

A: PCB screw terminal blocks are connectors that terminate a single wire and connect it to a circuit or other system. PCB screw terminal blocks come in a range of shapes, sizes and ratings, but always terminate a single wire (single pole) and are never multi-pole.
PCB screw terminal blocks are available as rows, but each terminal connects to only a single wire. PCB screw terminal block connectors are very useful in situations that require semi-permanent connections, which may require inspections, wire replacement, repair and change (this is why PCB screw terminal blocks are incredibly common in domestic wiring and industrial environments). While not all PCB screw terminal blocks have PCB contact pads or legs, they always have some mechanically solid body made of plastic or other insulating material.

Q: How to decide the PCB screw terminal block for you?

A: Choosing the right type of connector for your application may seem trivial but, in fact, is more complex than you may realize. The aspects of PCB screw terminal blocks that need to be considered are typically current requirements, voltage requirements, wire being used, mechanical strength and the environment.
Current requirements are arguably the most important aspect to consider because pushing too much current through a PCB screw terminal block can result in overheating and, therefore, the destruction of the PCB screw terminal block. When looking for a PCB screw terminal block, be sure that the chosen block can, in fact, handle the current that you expect to use plus 50 percent more. For example, if an expected current of 2 A is to be drawn from a block, then a PCB screw terminal block with a current rating of 3 A would be sufficient.

Q: What is the function of PCB screw terminal block in PCB?

A: PCB screw terminal blocks 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 is the maximum number of wires allowed under a screw terminal?

A: Normally, in a professional installation, whether wires are just stripped and wrapped around a screw terminal or a proper spade or ring lug is used, it is considered poor form if more than three wires or lugs are used.

Q: Can a PCB screw terminal block go bad?

A: One of the most common reasons for fuse tPCB screw terminal block failures is corrosion. Corrosion can form on the terminals and contacts within the block, causing a short circuit. Additionally, moisture can also cause corrosion, as can exposure to heat or cold. Fuse tPCB screw terminal blocks that fail due to corrosion should be replaced.

Q: Can you put more than one wire in a PCB screw terminal block?

A: As many as it will physically hold. Some PCB screw terminal blocks can hold dozens of wires; look inside any breaker box.

Q: What is the most common issue with PCB screw terminal blocks?

A: One common issue associated with PCB screw terminal blocks is Loose Connections: Over time, terminal screws can become loose due to vibrations or thermal cycling. Loose connections can lead to intermittent electrical contact, increased resistance, and potential overheating.

Q: What is the pitch of a PCB screw terminal block?

A: An electronics industry standard connection, this allows for reliable connections with a variety of differently sized devices. It has a straight body orientation and a pitch of 2.54 mm. With straightforward through-hole mounting, this PCB terminal strip is a highly versatile component.

Q: How to use a screw PCB screw terminal block?

A: First, strip a small amount of the insulation off of the end of the wire (about one inch or so). Unscrew the PCB screw terminal block's retaining screw, then place the wire inside the hole. Tighten the screw, making sure that it's secure. If the wire is loose, it'll eventually melt the insulation.

Q: How are PCB screw terminal blocks wired?

A: Wire-Securing Method: Similar to orientations, there are three common wire-securing methods for PCB screw terminal blocks: screw terminal, push button, or push-in. All three types are relatively true to their name.

Q: Can you cut PCB screw terminal blocks?

A: PCB screw terminal block strip can be easily cut to shorter lengths if required. High elasticity,withstand high temperatures and pressure,high impact resistance.

Q: What size are the screws in a PCB screw terminal block?

A: PCB screw terminal blocks have 10-32 threads and a 1/4" mounting holes. 15 amp and 20 amp have a rating of 20 amp, 300 volts. They have #6-32 screws and #6 mounting screws.

Q: How do you remove a screw PCB screw terminal block?

A: Insert a small screwdriver in the slot between the PCB screw terminal block and the connector header.
Gently pry the PCB screw terminal block at an angle away from the connector header.
Remove the PCB screw terminal block from the connector header.

Q: Should you use ferrules in screw terminals?

A: In a screw-type or screw less type terminal connection as per EN 60999-1, the use of ferrules is neither prescribed nor ruled out. Users have to make their own decision here.

Q: What is the function of a 3 way PCB screw terminal block?

A: Typically used to connect two or more wires, it can be mounted directly onto the board. Should you experience any issues, the block is conveniently pluggable, allowing for the quick removal of connections if needed.

Q: How does a screw terminal work?

A: A screw terminal is a type of electrical connection where a wire is held by the tightening of a screw. Screw terminals, as individual connectors to a board at left, as a barrier strip with setscrews at top, and as a barrier strip with attached spade and loop lugs at bottom.

Q: How to connect wire to screw terminal?

A: Loop the wire hook around the screw terminal so that when the screw is turned closed, the hook will tighten the wire closed, not force it open. This means, essentially, that the wire should be looped around the screw terminal in a clockwise direction as you look down at the screw head from above.

Q: What causes a PCB screw terminal block to melt?

A: The most common cause of melting/burned terminals is a failure in the heating element. These often fail in a way that allows the heating element, which is encased inside a metallic tube with an insulating layer, to make electrical contact with the tube.

Q: How to choose a PCB screw terminal block?

A: Like most electronic circuits, the first items to evaluate are the circuit parameters of the application, including the nominal current, the system voltage, and the number of circuits needed. The current and voltage rating of the PCB screw terminal block needs to be above the nominal current rating and system voltage.

We're well-known as one of the leading PCB screw terminal block suppliers in China. If you're going to buy or wholesale high quality PCB screw terminal block with competitive price, welcome to get pricelist from our factory. Also, customized service is available.

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