What's a fuse? This is a magical little object that will self-destruct when there is a state of surge current. So why create a device like this? The reason is simple, that is, to protect the rest of the circuit where the fuse is located, because the entire circuit will be destroyed compared to the minimum cost of replacing the fuse.
Fuses refer to self-destructing fuses in which a large surge or other current exceeds the circuit limit; That is, in order to protect the components in other parts of the normal circuit of the device where the fuse is located, the cost of replacing the fuse is negligible compared to replacing the entire circuit that may be damaged. Since the fuse is a common element that needs to be replaced, we introduce two basic common sense, a more in-depth introduction to the fusion application and test and diagnostic methods can be seen in the relevant articles of the website.
Common Sense 1: Determine whether the fuse is burned (fuse)?
If the fuse can be removed from the circuit, the case can be visual fuse to determine whether the fuse is blown; Fuses of other materials to determine whether it is continuity testing is the easiest way. Nawancan quickly test the meter to determine if it works properly, by either hearing a beep touch the wires together or seeing a 0 ohm reading. After confirming that the circuit power is turned off, put the lead on both ends of the fuse, if you hear the same buzzer, the resistance reading of the multimeter is very low, then the fuse will not be blown. If you don't hear the beep, the meter is OL, then the fuse will blow. Take reasonable precautions to stay away from dangerous voltages. Give the power circuit and then switch to the multimeter voltage measurement mode. Ensure that the DC circuit selects DC, the AC circuit selects AC... Multimeter leads on both sides of the fuse. If the indicated voltage is small, or even not, the fuse is intact. However, if a voltage difference (usually the full supply voltage amplitude) is present, the fuse is blown.
Common Sense 2: How to change the fuse correctly?
It is best to replace a bad fuse with an original model of the same specifications. If there is no fuse of the same specification, please note whether the type of fuse used is fast or slow. Usually, slow fuses can be quickly blown into place (rather than temporarily used) slow fuses, but never vice versa. Slow fuse for inductive circuit. A starting motor (excluding frequency conversion) is an example, although the motor's current rating is low, when the starting current is 3-7 times the rated current. When driving a slow fuse, a high current can be allowed for a short period of time, but the time should be very short. In this case, if a fast fuse is used, it will immediately disconnect the current.