GFI or GFCI as they are somtimes called (ground fault circuit interrupter) 
normally have internal contacts like a relay to make and break the circuit. 
Hence they are eaily resettable. 

Inge, older style glass tube fuses sometimes had an intenral spring to pull the 
broken parts apart quickly to avoid arcing. Perhaps you are thinking of these 
used in vehicles, however, most vehicles fuses lately ar ethe plug-in blade 
type. There may be one or two of these still in a vehicle as the main fuse. 

Blair

On Fri, 21 May 2010 13:36:55 +0200, Inge <[log in to unmask]> 
wrote:

>I don't know your habits. Very few have a GFI two feet from their body half
>an hour each morning and each  afternoon.
>What I think of costs only 10 cents each. A GFI several dollars.
>A thread:  it's spring loaded with a weakened middle section.
>And most people use S words when they try to find its placement.
>
>Inge
>
>
>--------------------------------------------------
>From: "Drew meyer" <[log in to unmask]>
>Sent: den 21 May 2010 13:26
>To: <[log in to unmask]>
>Subject: Re: [TN] Visual clues of over-current for leads, additional
>
>> Inge,
>>
>> Would you mean the Ground Fault Interrupter (GFI) outlet?  A fascinating
>> device.  In simple terms in monitors the hot lead current flow and the
>> neutral
>> lead current flow.  If there is a small difference, I've heard 20mA as a
>> number,
>> the outlet is interrupted.  If 20ma more is flowing through the hot lead
>> than
>> the return it means that the current flow has found another way to
>> complete
>> the circuit.  The most likely path in that case is you! So if an outlet is
>> within
>> 6ft of water or a potential location for water it must be protected by
>> GFI.
>>
>> Drew
>>

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