H2EDGKD-2.5 Spring screwless Terminal block

H2EDGKD-2.5 Spring screwless Terminal block

This type of terminal block is a very popular connection solution in the fields of industrial control, automation, communication equipment, etc. It perfectly combines the convenience of plugging and unplugging with the reliability of spring connection.

1.Type and Pole

Type: Pcb Pluggable  Terminal Block

1. Core Feature: What is "screw-free spring"?

The wiring part of this terminal no longer uses traditional screws and screwing actions, but instead utilizes a pre-tensioned spring to clamp the wire. Its core is the cage spring or compression spring structure.

II. Design structure of wiring part

The wiring section is usually composed of the following key components:

Wiring chamber/conductor entry

This is a hole that allows for the insertion of wires. Its diameter is typically optimized for a specific range of wire diameters (such as 22-14 AWG), and it features a guiding bevel to facilitate wire insertion.

The cavity is made of high-strength, flame-retardant insulating material (such as PA66 nylon) to ensure electrical safety.

spring leaf

Material: Typically made of high-quality stainless steel with excellent elasticity and fatigue resistance, such as 1Cr18Ni9 (304 stainless steel).

Shape: The most common shape is a V-shaped spring steel plate. This "V" structure is the key to providing a constant and strong clamping force.

Position: The spring leaf is pre-compressed between the internal conductor and the shell, in a tensioned state.

Operation hole/Reset hole

This is a small yet crucial hole, typically located directly above or on the side of the wiring cavity.

It is a channel used for inserting a specialized operating tool (usually a standard straight screwdriver) to open the spring.

Conductor

This is the core of current transmission, typically made of brass or phosphor bronze, with a surface plated with tin or nickel to enhance corrosion resistance and conductivity.

One end of it is connected to the spring leaf, and the other end is connected to the pin base for plugging and unplugging.

Pole:

2.Material  Of  Pluggable Terminal Block

3.Electrical  Of  Pluggable Terminal Block

4.Mechanical  Of  Pluggable Terminal Block

The ingenuity of this terminal lies in its simple yet efficient mechanical action.

Wiring process:

Preparation: Strip off about 9-11mm of the insulation from the wire (please refer to the product manual for the specific length), revealing the clean conductor.

Unlocking the spring: Insert a straight screwdriver of the appropriate size vertically into the operating hole and push it firmly to the end. At this point, the lower end of the screwdriver will push open the lower arm of the V-shaped spring plate, separating it from the conductor and forming an insertion channel for the wire.

Inserting the wire: With the spring in an open state, insert the prepared wire all the way through the wire entry.

Pulling out the tool: Pull out the screwdriver slowly and directly. During the pulling process, the V-shaped spring blade will quickly rebound under its own elasticity, pressing its sharp edge firmly against the exposed copper conductor.

Completion: The huge and constant pressure generated by the spring ensures a low-resistance and highly reliable electrical connection.

Stitch removal process:

The process of removing wires is exactly the same as the process of connecting wires: insert the tool -> the spring opens -> the wire is released -> pull out the wire -> pull out the tool

5.Dimensions

Compared to traditional screw connections, this wiring method offers significant advantages:

Extremely high wiring efficiency: No need to rotate screws, the plugging and unplugging action is very fast, saving up to 70% of wiring time, making it particularly suitable for batch wiring and maintenance.

Excellent vibration resistance and maintenance-free: The continuous pressure of the spring can compensate for wire deformation and loosening caused by vibration, thermal expansion and contraction, ensuring that the connection points do not loosen over time. It is highly suitable for vibration environments such as rail transit and heavy machinery.

Perfect support for multiple thin threads:

No "screw effect": When tightening, screw connections may cut off some of the thin wires in the multi-strand wire, resulting in reduced contact area and localized overheating.

Surface pressure: The spring leaf exerts a wide and uniform pressure, which can firmly clamp all copper wires together without damaging the conductors and forming a larger contact area.

Misoperation prevention and high reliability:

As long as the correct tool is used and inserted to the end, the wiring quality will be consistent and reliable, reducing problems caused by inconsistent torque applied by operators (tightening or loosening screws too much).

The wire is securely locked and can only be released with a specialized tool, thus preventing accidental detachment.

Notes:

It is essential to use the appropriate tool: it is recommended to use a straight screwdriver specified by the manufacturer or a standard one, with a blade width of typically 2.5mm or 3.0mm. Using an unsuitable tool (such as a knife or tweezers) can damage the operating hole and spring.

The wire must be inserted to the end: Ensure that the insulation of the wire is outside the wiring cavity, and the bare conductor is fully inserted to the end, making contact with the internal conductive body.

Wire gauge matching: Strictly adhere to the wire specification range supported by the terminal. Wires that are too thin or too thick will affect connection reliability.

6.Advantages 

☑ Adapt to multi-type sockets, device design is highly flexible
☑ Keying requirements can be met
☑ Universal installation method, suitable for various situations

7.Application  Of  Pluggable Terminal Block

1.Motion controller    2.Three-phase power meter   3.Microcomputer protection device  4.Electric equipment

5.Automation equipment  6.Security equipment  7.Internet of things equipment

8.Package  Of  Pluggable Terminal Block

We choose the high quality and safe packaging material to make sure  your order  won't  be damaged during delivery.

These trade terms are acceptable:EXW,FOB,CFR,CIF.