Terminal Blocks Explained

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In this video, we’re going to introduce you to the terminal block which is an important component in any industrial setting.
Terminal blocks are components with an insulated frame that has the sole purpose of securing two or more wires together.

Terminal Block wiring is neat and orderly allowing for quick identification making modification and troubleshooting easier.

Terminal blocks are classified based on characteristics such as structure, device type, and termination options.
There are a variety of methods used to connect the wires inside the terminal block.

1) Probably the most commonly used method for connection is the Screw-in terminal block. https://bit.ly/3F5NKbc

Screw-in terminal blocks are those that use screws as the method for holding the wires.

2) The Barrier terminal block is very similar to a Screw-in terminal block as they use screws to clamp the wires. https://bit.ly/3F6SbCz
Depending on the application and environment, the Barrier terminal strip may have a small lid to protect the wiring.

3) Another common method for wire connection is the Spring-Loaded terminal block. https://bit.ly/3to7AMg
A connection is made by simply inserting the wires. Most of these terminal blocks require the wire to be attached to a ferrule before it is inserted.

The ferrule or wire is attached and released by inserting a spring release device. Some vendors have a unique spring release device while others require a small screwdriver.

4) The Push-fit or Push-in terminal block is becoming very popular. https://bit.ly/3LWmXBZ
Much like the Spring-Loaded terminal block, the “Push-fit” often requires the wire to be covered by a ferrule.
The big difference between the Spring-loaded and the Push-fit terminal block is the method of wire release. Push-fit terminal blocks have the release device mounted right next to the wire insertion point.

5) Another terminal block that was first used in the Telco industry is the Insulation Displacement Connector or IDC. https://bit.ly/46mBzCM
The wire insulation does not need to be removed before insertion. Two sharp blades inside the terminal block will slice through the insulation and make contact with the wire.

6) As the name suggests, a Pluggable terminal block has a plug outlet to allow connection to a socket.
The wire is inserted and clamped with a screw. Connection to the wire is made via a plug and socket configuration. This terminal block is used in situations where a quick disconnect is required.

7) On Tab Connector terminal blocks a wire attached to a connector is pushed onto a tab. https://bit.ly/3ZM5fqu
The wire can be crimp-connected or soldered depending upon the type of connector.
Tab Connector terminal blocks are also available where one side of the terminal block is a tab connection and the other side of the terminal block is a screw clamp connection. https://bit.ly/3LR23UO

Let’s have a look at some of the different terminal block types.

1) At first glance, a Ground terminal block looks like a typical Screw-in terminal block. https://bit.ly/46HqwEi
Instead of connecting wires, the Ground terminal block connects the incoming wire to Ground.
The wire is terminated by the panel or the DIN Rail or wherever the block is mounted…We will talk more about DIN rails later.

2) Fused Connection terminal blocks have a fuse inserted in series between the wire-in and the wire-out eliminating the need for external overcurrent protection. https://bit.ly/46ER2hh
To aid in troubleshooting, many vendors have included a built-in Fuse Failure LED circuit to provide a visual indication of the fuse condition.

3) A Thermocouple block is designed to accept thermocouple lead connections. https://bit.ly/3Q8K66U

To save space, individual terminal blocks can be connected to form groups or clusters and are generally structured in multi-level configurations. https://bit.ly/46F5UfF

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