# Fuse Protection inline with DC Brush Motor

I have run into a number of instances where my 12A DC brush motor (linear actuator) is being overloaded. I have tried fusing it with a 10A Blade Fuse as well as a 15A Blade Fuse. In both instances, the fuses failed to blow. I was under the impression that under-rating the fuse would cause it to blow sooner, and over-rating it would allow for a bit more amperage draw (or current spike) and blow.

Is there a reason why the fuses are not blowing in either situation?

• What does "overloaded" mean? Dec 12 '19 at 2:30

2. Measure the motor's resistance between the power terminals. Then calculate the stall current from Ohm's law, $I = \frac {V}{R}$. You may find that at the voltage you are running at that the stall current is lower than you expected.