Types of Terminal Blocks

 

What is a Terminal Block?

Terminal Block is a connector used to wind up a single wire and connect it to another system or circuit. There are wide range of terminal blocks are available in different sizes, shapes, and ratings but they always terminate a single wire only. Terminal blocks are very suitable for semi-permanent connections. And they are commonly used in domestic wiring and industrial wiring.

Types of Terminal Blocks

1. Screw Terminals:

Screw terminals are the most used connection methods in this method wires will be inserted into the terminal and clamped with the use of a screw. These terminals are commonly used in domestic as well as commercial wiring where voltage and current demands will be moderate. Over-tightening the wire while fixing can damage the inserted wire/cable which further may cause unreliable and dangerous connection.

2. Barrier Terminals:

Barrier terminals are similar to screw terminals and use screws to hold the cables although they have more than one termination point for multiple cables and have small barriers between every terminal. Some Barrier terminals also have a small lid and an enclosure to protect the cabling. These are commonly used in domestic wiring and also in high voltage applications which requires arcing and short circuits prevention.

3. Push-fit terminal blocks:

Small spring-loaded shafts in Push-fit terminal blocks allow the cable to enter the terminal block in one direction and hold it in place without allowing it to leave. This technology depends on a spring having enough force to keep the wire in contact with the conductive body. The disadvantage of these terminals is it’s not designed to be reused and do not have removing shaft. This makes repairing work a difficult task and sometimes the whole terminal needs replacing.

4. Pluggable terminal blocks:

Pluggable terminal blocks have a cable entry to allow the connection of a wire or cable and also a plug output that can be connected to a socket. This is very useful for connections which are expected to be removable for inspection purpose or for servicing purpose.

 

These are the 4 primary types of terminal blocks although there is the number of terminal blocks are available in the market with different technologies and mounting options. Analyze your application area and future requirements thoroughly before deciding on which to buy.