The car fuse box is the core protective device in the vehicle electrical system, mainly used for centralized installation of fuses to provide overload or short circuit protection for the circuit. Its core function is to cut off abnormal currents through a circuit breaker mechanism, preventing overheating of the circuit from causing fires or equipment damage. Fuse boxes usually adopt modular design, integrating power distribution, signal transmission, and intelligent control functions.
Structurally, the fuse box contains the following key components:
Engineering plastic shell (common flame retardant grade UL94V0)
Copper alloy terminal (68Pin is a typical configuration)
Multi layer PCB circuit board
Fast melting/slow melting fuse array (17 MINI fuses are common specifications)
In terms of technical features:
The working temperature range is usually -30 ℃~70 ℃
The protection level can reach IP66 (dustproof and waterproof)
Supports CAN2.0B bus communication
Customizable control logic (such as 19 DOH+4 DOL output configurations)
Installation precautions:
M5 bolts (4 fixing points) are required to ensure seismic resistance
The wiring harness interface should be waterproofed (it is recommended to use DTM sealed joints)
Suggested installation location away from high temperature sources (such as maintaining a 50cm distance in the engine compartment)
Industry development trends show that integrated intelligent fuse boxes are gradually replacing traditional products, with new features including:
Real time monitoring of current (accuracy ± 1.5%)
OTA remote upgrade capability
Fault self diagnosis system
Common troubleshooting:
Frequent circuit melting requires checking the impedance of the circuit (normal value should be less than 0.5 Ω)
CAN communication abnormality suggests terminating the resistor (120 Ω) first
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