Fast Acting and Slow Blow Fuses: How to Test Fuse There are two basic types of fuses: fast acting and slow blow. The fast acting fuses are open very quickly when the current value reaches their current rates. This fuse type is used in analog meter movements, because the current values that are too large can quickly destroy them, sometimes very quickly. The slow blow fuse hasa coiled construction inside. Their purpose is to open only on a continued overload, such as a short circuit. They are used in order to prevent the fuse from blowing during a temporary current surge. Never use the slow blow fuse in place of a fast acting fuse. It will open too slowly and the electronic components have a good chance of being damaged under a high current. In the opposite situation, when you use the fast acting fuse in place of the slow blow fuse, it won’t have a harmful effect but it will open up in situations when it is not necessary for it to. If a problem occurs with the electric fuse, you probably want to check out its condition. Turn the power off and remove the fuse from the circuit to check with a multimeter and set to the lowest ohms range. Connect the probes to both end of the fuse. You may check the fuse while it is still in circuit. A good fuse should read 0 ohm. A blown fuse is open and reads infinity on the meter.
Source of this article is the MidlandElectricSupply blog. blown fuse, center connector, electric fuse, electronic component, fuse, fuse element