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In Reply to: RE: Over sensitive Expensive fuses ??? posted by ABliss on June 10, 2007 at 08:57:36
You are correct different fuse materials have different "blow" charactistics.
I wrote something here a year or two ago about fuses material blow characteristics and how they sounded.
I suspect the unit really needs a slow blow fuse to allow for the power-on surge and the reason they dont blow when you power on the power-station is that it cant deliver the full surge current at powerup to blow the fuses.
Chris
Follow Ups:
So with the power already sitting at the switch, the surge is greater than when the Exactpower is turned on from a cold start to power everything? Hmmm, still sticking with the cheap one, the difference in sound doesn't justify the cost.
AB.
"So with the power already sitting at the switch, the surge is greater than when the Exactpower is turned on from a cold start to power everything?"Um, the power isn't "sitting at the switch". Current/voltage does not flow from the outlet in your PC until the switch on the component is engaged that then allows the circuit to "draw" power from the PC or from the wall outlet, for that matter. In addition, the component/circuit will only "draw" what power is needed to operate the circuit.
If your using your PC to power up all the components in your system at one time, your initial power draw at start up will be vastly greater than if U powered up each component sequencially/seperately.
"Hmmm, still sticking with the cheap one, the difference in sound doesn't justify the cost"
If a fuse is manufactured to a specified rated current draw/flash over voltage, then it stands to reason that it wouldn't matter what the conductive metal or fuse element is made of, it should blow when the capacity has been exceeded.
Still, your observations with regards to the fuses do induce some thought pondering.........
Cheers
"If your using your PC to power up all the components in your system at one time, your initial power draw at start up will be vastly greater than if U powered up each component sequencially/seperately."
If thats the case, why doesn't they blow when I power up everything from the power conditioner.
AB.
I think you missed the point i was trying to make.
Kenster is correct at the intial current drawn by each component is higher when each device is powered up separatly. But the combined current delivered to each component when they are all swiched on and the powerstation switch is thrown is some what limited by the powerstation unit itself, hence each component is not able to draw the full inital current surge from it, so the current to the devices is not as high at this intail stage. The actual current surge can be many times the the running current (depending on the individual devices power supply's design).
But I agree at $25 a punt they are not worth it imo.
btw
fast blow fuses are in the 10-50msec range
slow blows are about 250-500ms.
fuseology is a bit of science in itself using different materials ranging from nickel, mild steel, tungstun steel to bronze,brass and copper,silver and gold and there alloys. So the chances are that each has a different sound on different equipment. (not that my toaster seems to care:).
Chris
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