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Wonke Electric Co., Ltd is a professional manufacturer founded in 1999, specializing in electrical engineering with all kinds of terminal blocks, air fans filters, etc. We have our research and development team to bring out various kinds of products and solutions to meet the customers' requirements. Our products are widely applied to electronic equipment, machine building, plants engineering, process industry, etc. To complete internationally, your plants need to satisfy high standards of safety, quality and performance. These targets can be achieved with our products and services. We can help you bring new ideas and solutions for providing customers around the world, OEM is also support. This is also what we understand for services.

Latest News

  • December 09 2020

    Terminal blocks ensure safe currents as well as safe wiring of installations

    From control panels for industrial productions to fuse boxes in private homes: Terminal blocks ensure safe currents as well as safe wiring of installations. Plastics used to manufacture terminal blocks have to meet high requirements for fire protection and mechanical and thermal properties. In electrical engineering, terminals are used to connect wires and cables. Continuous safe contact has to be ensured for the connection – mechanical fixing ensures this. Terminal blocks can be arranged in any order on a mounting rail and installed with a simple snap. This defines the mechanical properties required for this material: plastics used in this application must exhibit high elasticity and good toughness – or run the risk of breakage when snapping. Connections require sufficient stiffness and strength. When handling electrical power, sparking and fires may occur. Other requirements include high temperature resistance and heat aging resistance Plastics have electrical insulating properties, which generally recommends them for electronic applications. Terminals are produced in extremely large quantities by injection molding. Economic production requires short cycle times and low maintenance cost for injection molding tools and machinery. It is also necessary to be able to produce very low (0.4 mm) wall thicknesses with the plastic. In addition, good colorability of the material plays an important role: Different colors of the terminal blocks serve to differentiate between different functions (e.g. neutral conductor, protective conductor, etc.) and ensure safe installation.

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  • December 09 2020

    Terminal blocks may use one of several different methods to achieve wire connection.

    crew clamps use a screw to tighten the wire and make an electrical connection and are the classic, industry standard termination method. This type can accommodate a very wide range of wire sizes and provides a reliable connection. Spring clamps use the force of a spring to retain wire clamping. They represent a newer alternative to screw clamps and are particularly useful in applications using small wire diameters and limited working space. Insulation displacement connections (IDC) push the wire between two sharp pieces of metal, allowing a connection to be made without exposing any bare wire. Tab connections are designed to be inserted and removed rapidly without the need for soldering. They are also known as spade or blade terminals. Orientation Terminal blocks are commonly available with one of three different wire entry angles: 45°, 90°, or 180°. 90° and 180° types are also referred to as horizontal and vertical, respectively. Contact and Wire Specifications When discussing terminal blocks, the term "contact", also known as a position, way, or pole, refers to a wire attached to the block. The number of contacts is an important specification when considering a product, as a buyer is required to match this number with the number of wires necessary for a project or application. Contact pitch refers to the distance between each contact, measuring from the center of each hole or opening. Contact pitch is directly related to the number of contacts and is typically expressed in millimeters (mm). Terminal blocks are typically manufactured to accept a range of wire or conductor sizes. North American wire size is expressed in American wire gauge (AWG), which is a standard for non-ferrous wire conductor sizes. Higher AWG numbers represent smaller conductor diameters, and vice versa. For example, a typical AWG 12 household wire has a larger diameter than a AWG 22 teleph

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  • December 09 2020

    Terminal blocks selection guide-------According to their structure type

    Terminal blocks are modular, insulated blocks that 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. Terminals are useful for connecting wiring to a ground or, in the case of electrical power, for connecting electrical switches and outlets to the mains. Terminal bodies typically consist of a copper alloy with the same expansion coefficient as the wire intended for use. This not only prevents loosening because of differing expansion rates but also reduces corrosion caused by electrolytic action between two different metals. Terminal blocks can be classified according to their structure as well as device type. Structure Types Single Feed Through Single feed products represent the basic type of terminal block, and are used for wire-to-wire connection. Single feed terminal blocks have one input and one output contact: two distinct wires are fed into either side of the terminal block and are connected within its housing. Dual Level Dual level terminal blocks have two levels of contacts; this arrangement saves space and simplifies wiring. Multi-level products may use a bridge to connect one contact level to another for increased circuit flexibility. Three Level Three level terminal blocks are essentially dual level products with an extra stacked level of contacts. Like dual level terminal blocks, they can also be bridged.

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