PCB direct welding screw type terminal blocks are modular, insulated devices that mount on printed circuit boards (PCBs) and secure two or more wires together. Terminal blocks are used to secure and/or terminate wires and, in their simplest form, consist of several individual terminals arranged in a long strip.
Benefits of PCB Direct Welding Screw Type Terminal Block
● Large wiring capacity, which can adapt to various wiring requirements.
● The crimping frame and the soldering pin are mechanically decoupled, that is, because the clamping frame and the soldering pin are not connected as a whole, the torque when tightening the screw will not be transmitted to the soldering point.
● The welding pin has a quadrangular prism shape, and the end shrinks and becomes thinner. When inserting the solder hole, the contact area is increased. Welding liquid is easy to dissolve into the welding hole, and it is not easy to weld.
● The welding needle is made of copper alloy, and the welding needle has no dirt to ensure the long-term reliability of welding.
● Tinned solder pins, easy to solder.
● With heat dissipation channel.
● The end of the solder pin shrinks and becomes thinner, which is easy to install.
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![PCB Direct Welding Terminal Block]()
PCB Direct Welding Terminal Block
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Direct Welding Terminal Blocks
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![Direct Welding Pluggable Connector for PCB]()
Direct Welding Pluggable Connector for PCB
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![3.81mm Pitch PCB Terminal Block Connector]()
3.81mm Pitch PCB Terminal Block Connector
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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.
WIRE-TO-WIRE CONNECTORS
Wire-to-wire connectors are a type of tool used in attaching or joining two wires together. In simple terms, they facilitate a seamless flow of electric current from one wire to another. You might recognize these handy little pieces from their use in vehicle systems, home appliances, and even industrial machinery.
● Offer a quick disconnect feature
● Enable reversed connections
● Can withstand strenuous conditions such as heat or vibration
You'll find these indispensable connectors in everything from your household microwave to industrial-grade machinery.
BOARD-TO-WIRE CONNECTORS
Board-to-wire connectors offer a direct linkage from a wire to a PCB board. A common example most people would be familiar with is a standard computer USB port.
● Ensures secure and stable electrical connection
● Available in several pin counts to cater to different requirements
● High durability against thermal and mechanical stress
It's worth mentioning that for our laptops, smartphones, and other digital devices, these board-to-wire connectors are doing the heavy lifting behind the scenes.
BOARD-TO-BOARD CONNECTORS
Board-to-board connectors take center stage when multiple circuit boards are involved, enabling communication and electric current flow between them. These connectors are further classified into various types like pin headers and socket connectors, showcasing their diverse applications in multiple fields.
● Can be customized to accommodate unique physical requirements
● Allow for simpler and faster assembly processes
● Can safely handle considerable electrical loads
Whether it's in your gaming console or digital camera, these connectors are driving the core functionality of countless electronic devices.
WIRE-TO-BOARD CONNECTORS
Finally, we have wire-to-board connectors which, as their name suggests, connect wires directly to a PCB. These are vital links in several electronics, from refrigerators to televisions.
● Highly adaptable to various board layouts
● Compact and lightweight
● Simplifies assembly process
Whether it's a wire-to-wire, board-to-wire, board-to-board, or a wire-to-board connector, each type of PCB connector plays a critical role in our daily electronics usage.
PCB Direct Welding Screw Terminal Connection Method
Screw Clamp connection
Screw Clamp Connection is the most popular method of wire termination. It offers distinct advantages over the other wire termination methods such as (i) Suitable for all types of wires, (ii) Wires can be connected without any special preparations (iii) Simple connection and disconnection of wires with the aid of an ordinary screw driver.
The steel clamping screw produces high contact force while the steel clamping yoke transmits this force by pressing the conductor against the current bar, which is made up of electrolytic copper. When the clamping screw is tightened, the clamping yoke gets pulled upwards, pressing the wire against the current bar. A flat clamping area ensures safe grip of wires of smaller cross sections.
Spring Clamp connections
Screw-less Spring Clamp connection is as versatile as Screw Clamp connection. In this type of connection, the wire is held against the electrolytic copper current bar directly by a pre-stressed spring clamp. The spring is operated by using a screwdriver to provide access to the wire through the opening in the spring clamp. The inserted wire gets clamped on to the current bar on the removal of the screwdriver. The high-quality stainless steel clamp ensures a good connection of the wire with minimal contact resistance. The features of Spring Clamp connection are (i) Easy operation and time-saving connection method, (ii) Vibration proof connections (iii) Fail proof safe and maintenance-free connections.
Cable Lug and Bus bar Connection
This method of wire termination is preferred for connections that are subject to very severe vibrations. The wire is crimped to ring or fork type lug and is screwed on to the flat current bar in the PCB direct welding screw type terminal block . This type of connection is also preferred for wires of larger cross-section; the conductor is fitted with a ring lug and bolted on to a flat current bar.
Tab Connection Method
Tab connections are preferred in applications where the connected wire needs to be frequently connected and disconnected. Tab sleeves with the crimped wires are pushed on to the Terminal Block. These are simple connections and allow connection and disconnection of wires in a circuit with ease.
Solder connections are suitable for wires up to 2.5 sqmm. In this type of connection, the wire is soldered to a solder lug. These are firm and permanent type connections and cannot be easily removed.
Push-in Type Connections
Push-in Type connection is a next-generation connection method and offers tool-free direct push-in type connections. Solid conductors can be directly used whereas stranded wires are lugged and pressed inside the clamp. The clamp is automatically opened and the wire gets locked inside the Terminal. Some of the features of this connection method are (i) Time-saving and fool-proof connections (ii) Convenient wire insertion without using any tool (iii) The wires can be easily released when required.
Plug and Socket Connection
Pluggable connection type Male – PCB direct welding screw type terminal blocks are an excellent solution for creating a wire harness. These can be either Din Rail mounting or Free Floating connections and find application is machine building wherein two separate units are brought together and electrically interconnected.
When designing a system that will utilize a PCB direct welding screw type terminal block, you will likely know your overall system voltage and current requirements. While these are very important, there are other factors to consider in your design as detailed below.
Current Rating
The current rating is often the most important parameter to consider in PCB direct welding screw type terminal block designs. The current rating is based on the conductivity of the terminals, cross-sectional area, and the corresponding heat rise. Operating at too high of a current can cause overheating and damage of the PCB direct welding screw type terminal block, leading to major safety concerns. It is best practice to use a PCB direct welding screw type terminal block that is rated for at least 150% of the max current that is expected in the system.
Voltage Rating
The voltage rating is in part determined by the dielectric strength and pitch of the PCB direct welding screw type terminal block housing. The maximum system voltage of the application must be less than the voltage rating. Any voltage surges in the system should also be evaluated when selecting the PCB direct welding screw type terminal block.
Pole Count
The number of individual circuits within the PCB direct welding screw type terminal block is also known as the pole count. This can be as few as a single pole, and as high as 24 poles and beyond, based on how many individual circuits are needed in the specific application.
Pitch
A PCB direct welding screw type terminal block's pitch is defined as the center distance from one pole to the next. The pitch of the connector is often determined by the overall rating of the PCB direct welding screw type terminal block where factors like voltage/current, creepage, and clearance are considered. Common industry pitches would be, but are not limited to, 2.54 mm, 3.81 mm, 5.0 mm, and 7.62 mm.
Wire Size/Type
The minimum and maximum wire size that the PCB direct welding screw type terminal block can accept would be a function of the voltage/current rating. In addition to making sure the wires used will physically fit into the PCB direct welding screw type terminal block, the type of wire should also be considered. Stranded or multi-core wire is typically used for screw terminals, and single-core is typically used for push-in style terminal blocks. In North America wire size is specified in units of American wire gauge (AWG). Wire size can also be specified as mm2.
The method in which the wires are secured in the PCB direct welding screw type terminal block housing are typically accomplished by three main types: screw terminal, push button, or push in.
Screw Terminal
Screw terminal or screw type PCB direct welding screw type terminal blocks secure the wire against the conductor in the PCB direct welding screw type terminal block by tightening a screw which closes the clamp.
Push Button
Push button PCB direct welding screw type terminal blocks secure the wire against the conductor by a spring clamp that is opened by pressing a button. Releasing the button clamps the spring onto the wire.
Push-In
Similar to the push button with a spring clamp, a push-in PCB direct welding screw type terminal block allows the wire to be pressed directly into the housing without the use of a push button to open the spring.
Dual Lever Spring Technology: Many PCB direct welding screw type terminal blocks utilize spring-clamp technology for wire connection instead of traditional screw terminals. Spring-clamp terminals provide a reliable and vibration-resistant connection by exerting constant pressure on the wire, ensuring a secure grip without the need for periodic retightening. This feature helps prevent loosening of connections over time due to vibrations or thermal cycling.
Dual-Pressure Plates: Some PCB direct welding screw type terminal blocks feature dual-pressure plates, which enhance contact reliability by providing multiple points of contact with the wire. This design helps distribute the clamping force evenly across the wire, reducing the risk of localized pressure points that could lead to loosening over time.
High-Quality Materials: PCB direct welding screw type terminal blocks are manufactured using high-quality materials such as flame-retardant plastics and corrosion-resistant metals. These materials help ensure long-term durability and maintain the integrity of connections even in challenging environmental conditions.
Comprehensive Testing: Typically subjects its PCB direct welding screw type terminal blocks to rigorous testing procedures to verify their performance and reliability under various operating conditions. This includes testing for mechanical stability, electrical conductivity, and resistance to environmental factors such as temperature, humidity, and vibration.
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
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