What will happen if you install a 6 amp SC fuse in a 15 amp fuseholder?

Installing a 6 amp SC (slow-blow) fuse in a 15 amp fuseholder can potentially work fine under specific conditions. This is primarily because the fuseholder is designed to accommodate fuses of different ratings, and in this case, the fuse itself will protect the circuit by blowing if the current exceeds its rating of 6 amps.

If the load connected to the circuit draws more current than the 6 amp fuse can handle, the fuse will blow and protect the wiring and any connected equipment from damage caused by excessive current. However, as long as the current remains below 6 amps, the fuse will not blow, and the circuit will operate normally.

It’s important to note that using a fuse with a lower rating than the wattage requirements of the overall circuit can lead to nuisance blowing under normal operating conditions. Additionally, using a fuse that is rated for much lower than the circuit can sometimes be against electrical codes and can introduce safety risks, as it does not provide the necessary current capacity that might be expected in a 15 amp system.

In practical scenarios, care should always be taken to match the fuse rating with the circuit's design and intended load to avoid premature failures.