When does a fuse blow, why does it blow?
The fuse “blows” when the current carried exceeds the rated value for an excessive time. The higher the overload the shorter the period before the fuse blows. So, equipment which is meant to “draw” 10 amps but which has a short from phase to ground, so it draws, say, 100 amps, will blow its fuse in milliseconds.
Can a fuse blow at 2 x its rated value?
Assume that a fuse will blow “after a while” at 2 x its rated value then we can expect it to run indefinitely at its rated value. If we have a household circuit rate at 20 amps and a number of outlets rated at say 10A then it is possible to connect more load that the rated fuse value.
How long does it take to melt a fuse?
But, a piece of equipment which draws say double the fuse’s rated value, may take many seconds to melt the fusewire and to blow the fuse. The ratio between trip times (time to blow) and “overload to rated current ratio” vary with fuse design and can to some extent be controlled by the manufacturer.
When to use a higher current rating fuse?
Higher current rating fuses shouldn’t be used unless the wiring it protects can handle it. The load attached is irrelevant. If the load wants more current than the wiring can handle, putting in a larger fuse is just asking for trouble. The load should be put on wiring that can handle it.
How often do you get a blown fuse?
Most people probably have experienced a blown fuse at one time or another. Someone always knows what to do when this happens. If you’re a homeowner, that person probably is you. Blown fuses are a common occurrence.
What happens if you have a bad fuse?
If the fuse is bad, upon retrieval and inspection the wire inside of the fuse will broken, burnt, or otherwise disconnected. A blown fuse will have to be replaced with a new one in order to restore function to the circuit. A blown fuse should also be investigated to determine what caused the fuse to blow in the first place.
The fuse “blows” when the current carried exceeds the rated value for an excessive time. The higher the overload the shorter the period before the fuse blows. So, equipment which is meant to “draw” 10 amps but which has a short from phase to ground, so it draws, say, 100 amps, will blow its fuse in milliseconds.
Assume that a fuse will blow “after a while” at 2 x its rated value then we can expect it to run indefinitely at its rated value. If we have a household circuit rate at 20 amps and a number of outlets rated at say 10A then it is possible to connect more load that the rated fuse value.
What happens when a fuse blows-the spruce?
The ribbon is sized to match the circuit wire gauge, and if too much current passes through the ribbon, it melts through, or “blows,” and the circuit goes dead. The face of the fuse has a small glass window through which you can see the metal ribbon, and when a fuse blows, you will see the metal ribbon melted through, or a cloudiness in the glass.