The terminal block is used to facilitate the connection of wires. But when procurement emails ask whether to use screw terminals or spring-clamp, or when specifications list “barrier blocks” without context, clarity becomes critical. It typically consists of a metal strip or bar that connects the wires through one or more screw terminals. Terminal blocks are commonly used in industrial and commercial electrical applications to provide a. A terminal block box, also known as a junction box or distribution box, is a closed or semi-closed enclosure that contains terminal blocks (usually in the form of screw-type, spring-type or peel-free type). It consists of a clamping component and a conducting strip.