Elon Musk is continuously talking about replacing low-voltage fuse and did not involve low-voltage fuse in Model3. However, high-voltage fuse remained. I wonder the reason why.
Low-voltage fuses are typically used to protect electrical circuits in a vehicle's low-voltage electrical system, which powers features such as the car's lights, audio system, and dashboard displays. High-voltage fuses, on the other hand, are used to protect the high-voltage electrical system, which powers the electric motor and other components in electric vehicles.
Elon Musk has spoken about his desire to eliminate low-voltage fuses in Tesla vehicles because they can be a source of reliability issues and maintenance headaches. By simplifying the electrical system in this way, he believes that Tesla can make their vehicles more reliable and easier to maintain over the long term.
As for why the Model 3 still has a high-voltage fuse, it's likely because it's a critical component that helps to protect the car's expensive and complex electric drivetrain. Even a small fault in the high-voltage system can potentially cause serious damage to the motor or battery pack, so it's important to have some level of protection in place.
Overall, while Tesla is moving towards a simpler and more reliable electrical architecture, it's still necessary to have some level of protection in place for critical components like the high-voltage system.
Instead of replacing high voltage fuse, could be used as backup only, high voltage faults current could be taken care by MCBs which could be reset after fault clearance in HV circuit …..
Due to its structure and risk, low-voltage fuses can be replaced but high-voltage fuses cannot.
Low-voltage fuses are for systems up to a few hundred volts. An electrician or qualified person can remove and replace them from a compact cartridge or plug-in package. Since the voltage is low, manipulating low-voltage fuses is not dangerous.
High-voltage fuses are designed for electrical systems with thousands or tens of thousands of volts. Low-voltage fuses are smaller and simpler than these, which are commonly incorporated into the equipment or system they safeguard. High-voltage fuses pose a greater risk of electric shock or arc flash due to their higher voltage and energy.
High-voltage fuses are usually located in enclosed systems that require special equipment and training to safely access and replace. Only trained and equipped professionals should replace a high-voltage fuse. Thus, replacing high-voltage fuses without training is risky and perhaps fatal.
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