As long as the electrical performance of products is involved, there will be fuses. Although the fuse may not attract everyone’s attention in the circuit, it plays a very important role. When the circuit fails or is abnormal, the current increases continuously. Moreover, the increased current may damage some important or valuable components in the circuit, and may also burn the circuit or even cause a fire. If the fuse is correctly placed in the circuit, the fuse will fuse itself to cut off the current when the current abnormally rises to a certain height and a certain time, thus protecting the safe operation of the circuit.
The basic function of the fuse is to protect the circuit when the circuit current is abnormal and exceeds its rated current. Fuses have two important operating parameters. One is the rated current and the other is the rated voltage. When using, select the corresponding fuse according to the current and voltage of the circuit. In structure, the general automotive fuse adopts the plug-in design. The fuse has an engineering plastic shell, which is wrapped with a melt structure made of zinc or copper, and the metal melt is connected with the pins. The specification of plug-in fuse for excavator is generally 2A to 40A, and its ampere value will be marked on the top of the fuse. If the amperage value is illegible due to the burnt fuse, it can also be judged by its color. According to international standards, 2A is gray, 3A is purple, 4A is pink, 5A is orange, 7.5A is coffee, 10A is red, 15A is blue, 20A is yellow, 25A is colorless and transparent, 30A is green, 40A is dark orange.
Because there are many parts and electronic devices on the excavator, and each device is equipped with a fuse. Therefore, in order to facilitate maintenance in the future, the designer concentrated the design of fuses in one place. This place is called a safe box. The fuse box is usually located behind the driver’s seat.
