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Terminal Blocks - Din Rail, Channel

Terminal blocks are a versatile electrical connection system used for a large variety of applications. Din Rail, channeled, and box terminals all provide safe and reliable power connection solutions. These devices are sometimes referred to as terminal blocks, power terminals, mini-connectors, and terminal strips. All of these terms refer to the same type of device.

Din Rail terminal blocks are designed to adapt to common distribution systems using DIN rails, such as those found in 19” structural applications. Din Rail terminal blocks are available in multiple varieties, such as including single-pole, dual-pole and double-level versions; with and without mounting flanges; in different widths; with different cable entry systems; and insulated and non-insulated instances. Din Rail terminals are also available with various outlet angles for different application requirements.

Channelled terminals provide a fast and secure connection system and are available in different sizes ranging from 6.3 to 16mm. Sometimes called mini-terminal strips, channeled terminal blocks have a pluggable connection system with an integrated lance to contact the conductor. This reduces the need for soldering and greatly reduces time and labor costs.

Note: For reliable Din Rail mounting, use of locally-sourced Phillips Pan Head screws with captive washers is recommended. M-3 screws of length of 32mm provide sufficient screw tension to mount onto the Din Rail.

Terminal blocks of various types come with different feature sets to meet the various needs of different applications. Some blocks come with an insulated isolating bar and test probes for troubleshooting, while others feature LED status indicators. Some come with a universal connection for either feeds or base units, thereby eliminating the need for different parts in different applications. The application requirements will dictate the features and specifications that are best suited for the job.

The working principle of the terminal blocks is based on the insertion and arrangement of the strands in the connection system, thus providing a compact solution for creating power connections. All terminals have contacts that fit into a connector body. These contact points are designed to hold and guide wires or cables to ensure a secure connection, and sometimes the contacts are built from heat-resistant metals like copper that are capable of dissipating heat generated by the system.

The layers of the cable are stripped and the individual conductors are then inserted into the terminal blocks. As the outside contact holds the cable, the terminal block has two contact rings that secure the connection. One of the contact rings will then be attached to the source power source, while the opposite contact is connected to the device or equipment requiring power. A secure connection is thus established between the two.

The current-carrying capacity of the terminal blocks depends on specific parameters related to the terminal block design, such as wire and conductor types, strip lengths and strip design, size of the contact surface, and current. The material and shape of the contact face can also influence the current-carrying capacity.

In sum, an appropriate terminal block features the right combination of features and specifications for the application, and this includes insulation, contact design, modularity, the number and type of poles, and other characteristics related to power supply. The physical shape of the terminal block also needs to be considered when selecting the correct terminal block for the job.

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