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Screwless Terminal Block

Company Introduction

CIXI WANJIE ELECTRONIC CO., LTD was founded in 1992, we are a professional manufacturer that specializing in R&D, design, processing, production, sales and service of terminal blocks. The products include PCB screw and spring, pluggable, MCS, feed through and barrier terminal block, which are widely used in electric power control, automation control, elevator, instrumentation, communications, power supply, security, lighting, rail transportation and other related fields. The products are sold all over the world and have received the unanimous praise from customers.

WANJIE has passed ISO9001, ISO14001, OHSAS18001, the products are UL, CUL, VDE, CQC, CE, CB, ROHS, REACH approved. Besides, with the excellent management, R&D and QC team, advanced testing equipment and production device, comprehensive quality inspection system and UL witness laboratory, we try our best to ensure the quality could reach the relevant standard as well as meet the requirement of customers.

Why Choose Us?

Excellent Product Quality
With the excellent management, R&D and QC team, advanced testing equipment and production device, comprehensive quality inspection system and UL witness laboratory, we try our best to ensure the quality could reach the relevant standard as well as meet the requirement of customers.

Rich Experience In Production
The products include PCB screw and spring, pluggable, MCS, feed through and barrier terminal block, which are widely used in electric power control, automation control, elevator, instrumentation, communications, power supply, security, lighting, rail transportation and other related fields.

After-sales Service
WANJIE not only develop standard product but also provide ODM/OEM service, in order to establish a long-term cooperative relationship with customers and provide them the best solution.

Global Shipping
Our products support global shipping and the logistics system is complete, so our customers are all over the world.

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What is Screwless Terminal Block

Screwless terminal blocks significantly reduce wiring and installation time due to the fact that no specialist tools are required. They also solve the issue of installing intricate and hard-to-reach systems.

Screwless terminal blocks connect multiple wires by pressing a lever whilst still providing a reliable and safe connection. This means that they can better withstand the vibration caused in transport applications, without the need for re-tightening.

Benefits of Screwless Terminal Block

One of the key benefits of screwless terminal blocks is that they provide a safer and more secure connection compared to other electrical components. Terminal blocks are designed to prevent electrical arcing and short circuits, reducing the risk of electrical fires and other safety hazards. They also provide insulation between different electrical circuits, reducing the risk of electrical shock and other safety hazards.

In addition to safety benefits, terminal blocks are also essential for improving the efficiency of electrical systems. They allow for easy and convenient connection and disconnection of electrical devices, making it simple to reconfigure electrical systems or make repairs. Terminal blocks are also designed to minimize electrical resistance, reducing energy losses and increasing the efficiency of electrical systems.

Another advantage of terminal blocks is their versatility and adaptability. Terminal blocks are available in a variety of sizes and configurations, making it easy to find the right terminal block for any electrical application. They can be used with a variety of conductors, including wires and cables, and can be easily modified to accommodate changes in electrical systems.

Screwless terminal blocks also play a critical role in power distribution systems, helping to distribute electrical power to various electrical devices. Terminal blocks are designed to handle large amounts of electrical power, making them ideal for use in high-powered electrical systems. They can also be used to distribute electrical power over long distances, reducing the need for additional electrical components and improving the efficiency of power distribution systems.

Types of Screwless Terminal Block

Screwless terminal blocks are widely used in many industries for their convenience and reliability. Various types of screwless terminal blocks are designed and manufactured to suit different uses and applications.

For panel mounting

Screwless terminal blocks for panel mounting are designed for direct mounting on the external panel of equipment and facilities. This allows for easy access and maintenance.

Primary applications include large equipment, facilities, and electrical wiring termination connection points.

For board mounting

Screwless terminal blocks for board mounting are designed for direct mounting on electronic boards. This allows them to be used in applications requiring compact design and high integration.

Primary applications include wiring terminations in electronic devices and PCBs, connections between modules, and signal transfer points.

For relaying

Screwless terminal blocks for relaying are used to easily connect and relay two or more electrical circuits. They are characterized by multifunctionality and modular design. In many cases, they are compatible with existing wiring systems.

Primary applications include connecting and branching between cables and extending or modifying electrical circuits.

Application of Screwless Terminal Block

Traffic Management Systems
A huge part of the transport industry, these systems cover things like CCTV and traffic lights. They’re crucial for keeping road users safe and on the move. They collect enormous amounts of data that needs to be processed and protected. As such, connection failures could result in massive data loss with drastic consequences.

Automated Ticketing Machines
For things like toll roads and car parks, automation keeps traffic flowing without the need for human input. Using screwless terminal blocks in this type of application gives you the peace of mind that everything will stay connected, 24 hours a day.

Vehicle Tracking
For businesses needing to monitor or track their fleet of vehicles, transport IoT plays an important role. Real-time data is sent from vehicles providing a huge range of data to improve safety and productivity.

Industrial Control Systems
The transport industry employs industrial control systems, including supervisory control and data acquisition (SCADA) systems, to manage processes accurately. This includes smart motorway technology and controlling rail tracks. Screwless terminal blocks are well-suited to this task due to their dependability and resistance to vibration.

Distribution Boards And Switchboards
Distribution boards and switchboards are central devices for power distribution and control. Screwless terminal blocks are extremely useful in these installations because they require solid connections and long-term reliability. They improve safety and maintainability by reducing the risk of loose screws and poor contact.

Semiconductor Manufacturing Equipment
In semiconductor manufacturing processes, which require precision and advanced technology, reliable electrical connections are essential. Screwless terminal blocks are ideal for quick and reliable wiring while maintaining signal accuracy and quality.

Machine Tools
Machine tools often operate in harsh environments with vibration and heat, requiring highly reliable connection technology. Screwless terminal blocks can maintain stable connections even under such conditions.

Storage Batteries
Screwless terminal blocks are increasingly being used to connect storage batteries. This technology is suitable for applications involving high currents and rapid charging and discharging, which require secure connections and high durability.

Photovoltaic/solar Power Generation Equipment
Photovoltaic and solar power generation equipment is sensitive to environmental influences and requires long-term reliability and ease of maintenance. Screwless terminal blocks are the ideal choice to meet these requirements.

Principle of Screwless Terminal Block

Screwless terminal block spring

The springs set into screwless terminal blocks are often made of stainless steel, and the conductive parts are electrolytic copper or tin plated, making them as durable as or more durable than screw-type terminal blocks over long periods of use. The clamping force of screwless terminal blocks is based on spring force, so they do not require periodic retightening as screw-type terminal blocks do.

The spring force set inside the terminal block secures the wire, and the larger the diameter of the wire, the stronger the clamping force. Therefore, even when using cables of different diameters on the same terminal block, the wire is not easily loosened and can be secured without damaging the wire.

Screwless terminal block fixing method

To secure a wire that has been stripped of its sheath, use a flat-blade screwdriver or a dedicated knob to reduce the force exerted by the spring to hold the wire in place, and insert the wire all the way to the back of the connection port. When removing an electric wire, use a flat-blade screwdriver or a dedicated knob to weaken the spring-loaded restraining force and pull the wire out of the connection port.

The History of Screwless Terminal Block

Screwless PCB mounted and Pluggable terminal blocks have been available for several years, however they’ve often required specialist tooling or at least a simple tool, such as a screwdriver, to open up the cage clamp prior to inserting the conductor.

Whilst this means the internal contacts are always closed and makes for a very reliable connection, it does somewhat slow down the installation and is not as user friendly as some terminals found within the electrical installation world (Such as Wago installation terminals). Since the creation of the lever installation block, the market has boomed and most electricians rely upon them everyday.

One of the main reasons electricians quickly adopted screwless terminals was the speed of installation. Within a split second you can safely and securely open up a lever terminal with just your finger, insert a pre-stripped conductor and terminate by closing the lever on the connector.

Precautions for using Screwless Terminal Block

Check the product specifications before use.

Use the appropriate product mounting method (ensuring insulation distance), connecting wires, and copper foil pattern of printed circuit in accordance with the working voltage and current.

The rated current represents the maximum current that one pole can carry. When a product allows the connection of two or more wires to one pole, make sure that the total current does not exceed the rated current.

Note that only copper wires can be used as connecting wires.

When connecting and disconnecting wires, make sure that the power is off.

Do not insert or connect any electric wires that fall outside the range of applicable wires.

When stripping off a wire sheath, check the strip-off length specified for each product. When a product has a strip gauge, use the strip gauge.

Connect only one wire per slot. Connecting two or more wires to one slot may cause a malfunction.

When connecting or disconnecting a wire, press and hold the button at the lower limit (press it in and hold it). There are some products that do not require the button operation when connecting a solid wire.

The number of wire connections of some terminal blocks is limited depending on the number of button operations; be sure to check the number before use in consideration of the operation frequency.

Before inserting or removing a plug from a receptacle of a connector-type product, make sure that no load is applied (the power is off).

Using too much flux before soldering may cause the flux to get into the connection part, which may lead to connection failures. Use an appropriate amount of flux.

Note that products cannot be used in the following places: hot or cold places; moist places; places where condensation or freezing occurs; places exposed to direct sunlight; places subject to vibration and impacts; dusty places; places exposed to water, various types of oils, chemicals (including detergent), corrosive gases, etc.

Note that as a general rule products are not washable.

The product specifications show the diameters and cross-sectional areas of wires. When there is a disparity between the value in mm2 and that in AWG, apply the value in mm2.

The terminal blocks are for indoor equipment. Do not use them for outdoor purposes.

When inserting or removing a plug from a receptacle of a connector-type product, keep it straight without twisting it.

Solderability depends on actual conditions, such as equipment and printed circuit board on which the product is to be mounted, including flux creep-up. Be sure to check after the product is mounted on the equipment.

Note that products certified to overseas standards are subject to restrictions on specifications according to each overseas standard.

When fixing a connecting wire, make sure there is no tension on the connected wire.

When mounting the product, do not apply excessive tightening torque exceeding the specified tightening torque.

When connecting or disconnecting electric wires, be careful not to apply more load than necessary. Especially when handling terminal blocks for printed circuit boards, take care not to apply load to the PC terminals when mounting and operating the product.

Do not disassemble or reassemble coupled products as doing so may cause quality problems to occur.

The actual size of some coupled products may be smaller than the total length obtained by calculations and the pitch between mounting holes on the board. When mounting such a product on actual equipment, stretch it slightly in the pitch direction so that it is aligned with the holes.

The white adherents on buttons are accumulations of fluororesin applied to the buttons to make the operation of the buttons smoother. There is no quality issue with the product.

Do not use soldered stranded wires, or connection failures may occur.

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FAQ

Q: What is a screwless terminal block?

A: A screwless terminal block is an electrical connector designed for the termination of wires without the need for traditional Screw fastening. Instead, it uses a variety of press or clip mechanisms to hold wires in place.

Q: How does a screwless terminal block work?

A: Screwless terminal blocks employ a spring mechanism or similar technology that clamps down on the stripped conductor when a lever or tab is pressed. This creates a secure electrical connection.

Q: What are the advantages of using screwless terminal blocks?

A: The main advantages include faster installation times, reduced risk of incorrect wire termination, and easier maintenance due to the lack of screw tightening. Additionally, they provide a more consistent connection and can be less affected by vibration.

Q: What are screwless terminal blocks used for?

A: They are commonly used in various applications where rapid and reliable wire terminations are required, such as in power distribution, control systems, automotive electronics, and consumer appliances.

Q: What wire sizes can screwless terminal blocks accommodate?

A: The wire size range varies by model, but most can handle AWG 22 to AWG 14 (0.64mm² to 2.08mm²). Some larger blocks support even thicker wires.

Q: Can i use screwless terminal blocks for high voltage applications?

A: Yes, but it depends on the specific rating of the terminal block. There are screwless terminal blocks designed for high-voltage applications, but always check the manufacturer's specifications.

Q: Are screwless terminal blocks interchangeable with screw terminal blocks?

A: No, they are not interchangeable because of their different connection methods. However, both types serve similar functions in providing secure wire terminations.

Q: How do you install wires in a screwless terminal block?

A: Typically, you strip the insulation from the wire to the required length, insert the bare conductor into the terminal block, and then activate the clamping mechanism (press a lever or tab) to secure the wire.

Q: How secure are screwless terminal block connections?

A: Screwless terminal blocks provide very secure connections when used correctly. The spring-clamping action exerts a constant pressure on the wire, which minimizes the risk of loosening over time.

Q: Can screwless terminal blocks be reused?

A: Yes, many screwless terminal blocks are designed to be reusable. To remove a wire, you usually release the clamping mechanism and gently pull out the wire.

Q: What is the rated current and voltage of screwless terminal blocks?

A: Ratings vary widely depending on the design and construction of the terminal block. Common ratings might range from a few amps to several tens of amps and from 24V up to 690V. Always check the datasheet.

Q: Do screwless terminal blocks have any limitations?

A: One limitation is that they may not be suitable for very high current applications or situations where a large number of wires need to be connected. Additionally, incorrect installation can lead to poor connections or even damage.

Q: How do i choose the right screwless terminal block?

A: Consider the current and voltage requirements, wire size, environmental conditions, and the mechanical robustness needed for your application. Also, ensure it meets any relevant standards or certifications.

Q: Can i use screwless terminal blocks outdoors?

A: Some screwless terminal blocks are designed to be weatherproof and suitable for outdoor use. Look for products with appropriate IP (Ingress Protection) ratings.

Q: What tools are needed for wire termination in screwless terminal blocks?

A: You will need wire strippers to prepare the wires and possibly pliers or a special tool to activate the clamping mechanism, depending on the design of the terminal block.

Q: How should i maintain screwless terminal blocks?

A: Regularly inspect the connections for security and integrity. Clean the blocks periodically to remove dirt and debris. Replace any terminals showing signs of wear or damage.

Q: Are there standards for screwless terminal blocks?

A: Yes, there are industry standards that screwless terminal blocks should adhere to, such as UL, CE, and VDE. Compliance with these standards ensures safety and quality.

Q: What if i need to remove a wire from a screwless terminal block?

A: To remove a wire, release the clamping mechanism according to the manufacturer's instructions, and gently pull out the wire. Some blocks require a specific sequence of operations to avoid damage.

Q: What is the difference between push-in and spring clamp terminal blocks?

A: Push-in terminal blocks use a spring mechanism to grip the wire, while spring clamp terminal blocks have a separate spring that provides the gripping force. Both are types of screwless terminal blocks.

Q: Can i use insulated or non-insulated terminal blocks?

A: It depends on the application. In some cases, non-insulated blocks are used for better heat dissipation, while in others, insulated blocks are necessary for safety reasons.

We're professional screwless terminal block manufacturers in China for 30 years, specialized in providing high quality products and service. We warmly welcome you to buy bulk high-grade screwless terminal block for sale here from our factory.

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