- The correct way to connect a terminal block depends partly on the type of terminal block concerned. The three basic types of terminal blocks are screw in, plug in and printed circuit board (PCB).
Screw In
- Screw in terminal blocks are reserved typically for low voltage applications. Wires are screwed directly into the block, with a screwdriver and typically stainless steel screws, so that electrical current flows through the screw and the wire.
PCB
- PCB terminal blocks, also known as electronic blocks, are physically mounted and soldered onto circuit boards. They are available typically in one or two-tier versions, with a variety of wire entry angles. On a two-tier block, the holes for the wires may be staggered so that they still can be accessed with a screwdriver if the top tier is full.
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