As mentioned in the other answers, the fuse blows due to too much current flowing. After the fuse has blown the circuit becomes open so a voltage develops across the fuse (usually the supply voltage like mains voltage or the battery voltage). The fuse must be able to withstand that voltage and keep the circuit open.
You (wrongly) protect this circuit with a 1 A, 50 V fuse. When the fuse is intact (not blown) there is no issue, no more than 0.5 A flows through the fuse so it does not blow. Then a fault develops in the circuit making more current flow and blowing the fuse.
If you apply 240V to a circuit designed for 6V, the fuse will probably blow because the current in the circuit would be multiplied by 40 (240V/6V), thus the fuse would dissipate 40^2=1600 times more power. Well, if you want to get pedantic, ultimately it's heat that causes it to blow.
But, it's not the supply voltage or rated voltage of the fuse, it's the Voltage drop across the fuse along the R/Temp curve. Perhaps I'm being pedantic, but a fuse's usefulness really depends on it's non-linear R combined with the fundamental Power transfer law in a series circuit and power is a function of Voltage and Current.
The fuse has no idea how much voltage is involved. There's only a small fraction of a volt drop across the fuse. The fuse has no terminals connected to common, neutral, ground or any other voltage ref. The entire fuse floats at supply voltage. Until the fuse blows; then it has working voltage across it as long as the switch is on.
Nobody has yet pointed out clearly that the rated current of a fuse is the maximum current that it will happily pass forever. Over that and it will blow, the greater the overcurrent the quicker it blows, depending on slow- or quick-blow design, etc. The likelihood of a fuse blowing is based mainly on how inconvenient it will be.
My question is what causes these resistors to go bad? and why do they take out internal fuse protection and the fuse protection for the unit itself? Internal fuses are 100 amps …
Electrical Overloads. One of the most common reasons for blown fuses is electrical overloads. When the air conditioner draws more current than the fuse can handle, …
If you know this rating and the overall resistance (supply + fuse + ESR of the capacitor), you can calculate exactly how much far you are from blowing the fuse while the …
After the fuse has blown the circuit becomes open so a voltage develops across the fuse (usually the supply voltage like mains voltage or the battery voltage). The fuse must …
Attach a fuse (where the fuse rating is calculated using the formula: In = 0.8 / C (A), where C is the capacitor''s capacitance) in series with the capacitor and connect them to a …
Install a capacitor with higher voltage and ripple current ratings (assuming it isn''t too big to fit in the case). Make sure the unit isn''t running too …
After the fuse has blown the circuit becomes open so a voltage develops across the fuse (usually the supply voltage like mains voltage or the battery voltage). The fuse must be able to withstand that voltage and keep the …
It depends what the fuse was intended to protect, what the fuse type and rating are, and what caused the elco (electrolytic capacitor) to blow up. Internal pressure, rather than …
In addition to the fuse blowing, installing a fuse with a different ampere rating could damage the wiring and cause a fire. Therefore, when replacing a fuse, it is best to use the same type of …
effectively an overload protection if the capacitor is leaky internally or has been subjected to prolonged overloads trying to start a stalled motor. If the top is bulged, replace it. …
3. Faulty Capacitor. The capacitor in an air handler stores electrical energy to start and run the motor. A faulty capacitor can draw excessive current, causing the fuse to …
Capacitor Failure. Capacitors store electrical energy and help maintain voltage levels in the microwave. If a capacitor fails, it can disrupt the microwave''s electrical system, …
If the capacitor unit is protected with internal fuses the lost reactive power in the case of a blown fuse is very low (approximately 2% of a unit). Because of the low percentage power loss there …
AC Fuse Blown Because of Bad Capacitor. The capacitor in your AC unit is used to provide an initial "jolt" of electricity to start the electric motors in your AC unit. If your AC unit''s capacitor is bad, the compressor or condenser …
A fuse is blown, but the capacitors themselves are still functional. These blown fuses may stay on the system for quite some time before they are noticed (see Figure 6.14). Capacitors with blown fuses increase …
Blown Fuse: If the fuse blows, the capacitor is short-circuited internally. No Blown Fuse: After a few seconds of charging, turn off the power and discharge the capacitor …
It depends what the fuse was intended to protect, what the fuse type and rating are, and what caused the elco (electrolytic capacitor) to blow up. Internal pressure, rather than …
A capacitor that has failed or is malfunctioning can cause power surges or fluctuations, resulting in blown fuses. Replace any faulty capacitors to restore the proper …
Blown Fuse: If the fuse blows, the capacitor is short-circuited internally. No Blown Fuse: After a few seconds of charging, turn off the power and discharge the capacitor by shorting the leads with an insulated screwdriver.
Overheating: A failing compressor can generate excessive heat, causing the air handler to overheat and blow fuses. Capacitor Problems. Capacitors are electrical …
A fuse is blown, but the capacitors themselves are still functional. These blown fuses may stay on the system for quite some time before they are noticed (see Figure 6.14). …
A quick check of the fuse should be the first step, but if the fuse is good, then the problem lies elsewhere. A capacitors job is to block dc, allow ac currents to flow and provide filtering. A …
Capacitor Voltage Calculation For Blown FuseThis video shows a basic calculation of voltage across capacitors when a unit fuse blows. The capacitor unit with...
Install a capacitor with higher voltage and ripple current ratings (assuming it isn''t too big to fit in the case). Make sure the unit isn''t running too hot due to insufficient ventilation …