Definition

• The phrase "terminal block" can generally be applied to any kind of connector that allows multiple circuits to be disconnected at a single location.

Types

• Terminal blocks can be found in three categories: screw-in, plug-in and PCB (printed circuit board) mounted.

Screw-In Types

• Screw-in blocks can commonly be found on low-voltage circuits like stereo equipment. The main benefit of this type is the ability to use bare wire ends to make a connection, but the exposed wires are left exposed. This can lead to weathering-related and short-circuit malfunctions.

Plug-In Types

• Plug-in blocks can be found everywhere in a car and consist of a male terminal that plugs into a female receptacle. The best example of a plug-In type would be either of the average car's two fuse panels.

PCB Types

• Printed circuit board (PCB) blocks are permanently soldered to the circuit board on which they are found. Computer and sensor wiring harnesses are good examples of these.