AutomationDirect.com is a company that offers plug-in terminal blocks and has won awards for its technical support for the parts it sells. Plug-in terminal blocks differ in purpose and compatibility, and each must have its specifications examined before a user can determine its suitability for the required task.
Phoenix Contact also offers plug-in terminal blocks, explaining both the uses and details of specific models and of plug-in terminal blocks in general. Cable fixing and cable housing accessories are available for sale in addition to the basic switchgear plug-ins. Users search for plug-in terminal blocks by unit number or keyword. Phoenix Contact categorizes plug-in blocks by their approval or lack thereof from several organizations, including the Energy Action Coalition, an environmental clean energy organization, and Underwater Laboratories, a safety certification company. Grainger is another major company that offers terminal blocks for sale.
Circuits use terminal blocks for power distribution and to connect multiple wires to a single central hub, or connection point. This allows the relocation and readjustment of wires without the need for splicing, or cutting and resoldering wires. Changes in the function or configuration of the circuit can occur with less material and time consumed than by stripping the wire and reinsulating it.