The pluggable screw free terminal blocks have a standardized plug-in zone on one side and Push-in, screw, spring-cage or fast-connection technology on the other side. Due to the contact system, they can withstand extreme vibration levels. The plug-in terminal blocks save you a lot of time when carrying out signal and power wiring.
Benefits of Pluggable Screw Free Terminal Block
Reduce Space
By investing in pluggable screw free 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
Pluggable screw free terminal blocks increase safety by grounding, isolating, and protecting the other components in the electrical circuit. Pluggable screw free terminal blocks are available with finger-safe connections to prevent electrical shock.
And, pluggable screw free 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.
Pluggable screw free terminal blocks are available in a variety of designs. What they all have in common is that the terminal mechanism needs to be actuated by means of a stud screw. In this process, the conductor is pressed or clamped firmly against a latch made of a copper alloy. This is done perpendicular to the screw, usually from above or below, but to do this you require enough space.
Pluggable screw free terminal blocks offer a high level of safety, especially in the case of conductors with a large cross section and the high voltages associated with them. Another advantage is that most users find pluggable screw free terminal blocks intuitive to work with. However, the torque that needs to be applied when tightening the screws differs based on the terminal and the device's manufacturer, meaning that the conductor clamping force—and therefore the quality of the screw connection—is dependent on the user: Depending on the terminal's type and frame size, users have to change tools or use different tool attachments to apply the correct torque.
Key Pluggable Screw Free Terminal Block Mechanical Considerations
Wire-Entry Orientation
Pluggable screw free terminal blocks come available in three common orientations: horizontal, vertical, and 45°. Horizontal and vertical are also known as 90° and 180°, respectively. The wire orientation can often be determined by physical restrictions in the overall design that make one option more feasible than the other.
Wire-Securing Method
The method in which the wires are secured in the pluggable screw free terminal block housing are typically accomplished by three main types: screw terminal, push button, or push in.
Screw Terminal
Screw terminal or screw type pluggable screw free terminal blocks secure the wire against the conductor in the pluggable screw free terminal block by tightening a screw which closes the clamp.
Push Button
Push button pluggable screw free 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 pluggable screw free terminal block allows the wire to be pressed directly into the housing without the use of a push button to open the spring.
Module Type
Pluggable screw free terminal block modules can be constructed in pieces that are interlocked with one another, or in single housings. Interlocking pluggable screw free terminal block modules are typically constructed in 2 and 3 pole versions. With these two sizes, a designer can achieve any pole count that is needed by just snapping the modules together. DIN rail pluggable screw free terminal blocks operate in much the same way by sliding individual units together on the metal rail. Once the desired configuration and number of poles is achieved, they are then finished with a compatible end cap to protect the housing on the outer most units.
Single-piece pluggable screw free terminal blocks are constructed in a way that all poles are contained in a single housing. These are typical for pluggable housings where it would not be feasible to have multiple pieces. Other uses include high current or high temperature versions where a single housing would be stronger.
Wire-to-Housing Method
While most pluggable screw free terminal block connectors have wires inserted directly into the housing, there are some variations that utilize mating pairs that can be plugged together. These pluggable pluggable screw free terminal blocks still have the wires inserted into a housing, but with the additional benefit of a modular housing that can be plugged directly into a fixed housing on a PCB. These simplify designs where the main connections need to be disconnected frequently without having to disconnect all individual wires.
Current requirement
Current requirements are arguably the most important aspect to consider because pushing too much current through a pluggable screw free terminal block can result in overheating and, therefore, the destruction of the pluggable screw free terminal block. When looking for a pluggable screw free 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 pluggable screw free terminal block with a current rating of 3 A would be sufficient.
Voltage requirements
Just like current draw, voltage also needs to be taken into account. Voltage causes problems with dielectric breakdown such that a voltage too high for a pluggable screw free terminal block could cause current leakage between adjacent pluggable screw free terminal blocks. However, high voltage requirements are often rare in design, which is why voltage considerations are typically ignored for voltages under 100 V. However, it is still important that this figure is checked before a pluggable screw free terminal block is chosen!
Wire being used
Not all wires are equal, and each wire type has its own advantages and disadvantages. For example, when choosing a pluggable screw free terminal block for a cable, be sure to know the size of the cable (can it physically fit into the pluggable screw free terminal block?) as well as if it's single-core or multi-core. Multi-core wire does very well in screw terminals, whereas single-core wire does well in push-fit connectors.
Environmental/mechanical strength
The environment is a very important aspect to consider when choosing a pluggable screw free terminal block. Some pluggable screw free terminal blocks may be mechanically strong and able to handle high currents, but if the connection is being used in a naval environment, then the salty air could be detrimental to the metal contacts. The environment could also have wide temperate swings or contain mechanical vibrations, which make screw terminations unreliable.
Screw terminals
Screw pluggable screw free terminal blocks are those that have a screw as the method for holding a cable or wire. It is more common to see screws have flat-head fittings, and these types of terminals are often found in situations in which voltage and current demands will be moderate (domestic/commercial wiring). While wires bound to a terminal block are not physically bonded with the use of solder, they are incredibly strong if done correctly and can be used in permanent scenarios. Great care should be taken when tightening pluggable screw free terminal blocks because over-tightening can damage the inserted cable and result in an unreliable and potentially dangerous connection.
Barrier Terminals
Barrier terminals are very similar to screw terminals in that they use screws as the mechanism to hold cables. Barrier pluggable screw free terminal blocks often have more than one termination point for multiple cables and, because of this, have small barriers between individual terminals. Barrier terminals can also have small lids and enclosures to further protect cabling and are commonly found in domestic wiring and other high-voltage scenarios that need to prevent arcing or potential short-circuits.
Push-fit terminals
Push-fit pluggable screw free terminal blocks use small spring-loaded levers that allow cables to enter the terminal block in one direction but do not allow them to leave, effectively holding the wire in place; hence, the name “push-fit.”
This type of connector has some advantages over screw terminals in that they prevent over-tightening, but as a result, the designer is reliant on the spring having enough force to keep the wire in contact with the conductive body. Another issue with push-fit terminals is that some are not designed to be reused and lack a removing lever, which makes repair work difficult because whole terminals may need replacing.
Pluggable terminals
Pluggable pluggable screw free terminal blocks are those that have a cable entry to allow the connection of a wire or cable but a plug output to allow for easy connection to a socket. These types of pluggable screw free terminal blocks are very useful in situations in which hot-swapping may be important or a connection is expected to be removable for servicing or inspecting. Screw contacts are the most common type of connection method for inserted cables, but the screw often has a small metal plate attached to the end, which allows for gripping of both small and large cables.
Dual Lever Spring Technology: Many pluggable screw free 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 pluggable screw free 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: Pluggable screw free 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 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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