What is the function of the cartridge (such as porcelain) encasing the fuse wire?
To safely contain the melted fuse wire and prevent hazards
A fuse works by melting when the current exceeds a safe value, breaking the circuit. When the thin wire melts it can flash into hot droplets and produce a short arc.
The porcelain (or ceramic) cartridge is a hard, heat-resistant, non-conducting shell built to enclose this event. It confines the molten metal spray and quenches the arc so it cannot ignite nearby material or shock a user.
Porcelain is deliberately a poor conductor, so it does not carry current or improve conduction; it also does not increase the current or act as a heat sink for normal operation.
Hence, the cartridge exists to safely contain the melted fuse wire and prevent electrical hazards.
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