The working principle of a fuse holder primarily relies on the thermal effect of a fuse. A fuse holder typically contains a metal contact plate and a fuse. When the current flowing through the circuit exceeds the fuse's rated current, the fuse melts due to excessive heat, interrupting the current flow.
Install the fuse holder in the circuit, ensuring that the pins are properly connected to the pads on the circuit board.
When the circuit is connected and operating, current flows from the pads on the circuit board to the pins of the fuse holder.
The current flows through the metal contact plate to the load (such as a light bulb or motor).
If the current in the circuit exceeds the fuse's rated current, the fuse melts due to excessive heat.
Once the fuse blows, the circuit is interrupted, preventing further current flow, thus protecting the circuit from damage caused by overloads and short circuits.