Function

• Whenever an electrical circuit is installed in a vehicle, there must be some way to disconnect it from the power source for maintenance. A terminal block is used to place a number of circuit disconnects in one convenient location.
  
  

Common Usage

• The most common example of a terminal block in an automobile is the fuse box.
  
  

Racing Applications

• Race cars often use a number of terminal blocks as fuse panels. Aftermarket terminal blocks are used for their simplicity and reliability over factory panels.
  
  

Types

• Fuse blocks come in three basic types: screw-in (used on stereo equipment), plug-in (fuse panel types), and PCB mounted (used for sensor and computer wiring harnesses.)
  
  

Terminal Block Segregation

• Many have found it advantageous to use a separate terminal block for each of a car's systems. One for engine electronics and ignition, another for chassis and lighting, and another for accessories.