Custom DIN Rail Mount Terminal Block Manufacturer in China

DIN rail terminal blocks come in various types, each designed for specific wiring needs and applications.  

Screw Type Terminal Blocks: These are perhaps the most traditional and widely used type. They feature a screw that, when tightened, clamps down on the wire, securing it against a conductive metal bar within the block. This method provides a very strong and reliable connection, making it suitable for applications where vibration might be an issue or where frequent disconnections are not anticipated. They are known for their robustness and ability to handle a wide range of wire sizes, offering a secure and enduring connection. 

Spring-Cage Terminal Blocks: Also known as tension clamp or push-in spring-cage terminal blocks, these utilize a spring mechanism to exert continuous pressure on the wire. To make a connection, a tool (often a screwdriver) is inserted into a small opening to open the spring clamp, the stripped wire is inserted, and the tool is removed, allowing the spring to clamp the wire. They are valued for their vibration resistance, fast wiring times (compared to screw types), and maintenance-free operation as the spring continuously adjusts to wire movement or temperature changes.

Push-in Terminal Blocks: These represent a more modern and increasingly popular “screwless” option, especially for solid wires or stranded wires with ferrules. With push-in technology, the prepared wire can often be directly inserted into the terminal block without the need for any tools. An internal spring mechanism automatically secures the wire, providing a quick and efficient connection. They are highly favored for their speed of installation, reduced wiring effort, and suitability for high-density wiring applications where space might be limited.

Feed-Through Terminal Blocks: These are the most basic type, providing a simple, direct electrical connection between two wires entering and exiting the block. They essentially extend a single circuit, maintaining electrical continuity. They are used for general wiring applications where signals or power need to be passed from one point to another without any additional functionality like fusing or grounding. 

Ground (PE) Terminal Blocks: Easily identifiable by their green and yellow coloration, ground terminal blocks are specifically designed to establish a protective earth (PE) connection. They feature a conductive foot that makes a direct, reliable electrical connection to the DIN rail itself, which serves as the ground busbar when properly earthed to the cabinet or enclosure. This ensures that any fault currents are safely directed to the ground, enhancing system and personnel safety.

Fuse Terminal Blocks: These blocks integrate a fuse holder directly into the terminal block, providing overcurrent protection for specific circuits. They allow for easy insertion and replacement of fuses, offering a convenient and compact way to protect sensitive equipment or circuits within a control panel. Many fuse terminal blocks also include a blown fuse indicator (often an LED) for quick fault detection and troubleshooting.

Multi-Level Terminal Blocks: Designed to save space in crowded control cabinets, multi-level terminal blocks provide multiple connection points (two, three, or even more) stacked vertically within a single block. This allows for connections to different potentials or circuits in a compact footprint, effectively maximizing wiring density on the DIN rail. They come in various configurations, including those with internal shorting links or ground connections on specific levels.