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fuse with resistor in it?

T

tempus fugit

Jan 1, 1970
0
Hey all;

I'm looking to replace a fuse in a piece of gear and it looks like a normal
fuse (you know, an inch and a half or so long glass cylinder aboiut 1/4" in
diameter) exept that there is a resistor in there. I've never seen this
before - can I just replace it with a standard fuse? What is the resistor
doing in there (limiting the AC current draw)?

Thanks
 
D

Don Klipstein

Jan 1, 1970
0
Yo,

Although I have never seen this before, I have seen low value, low
power, resistors used as fuses. This sounds like such a thing put in a
tidy fuse container.

Since you want to replace it, I must assume that the resistor is no
longer readable. If you can still see the color bands, it is not yet
blown and your problem lies elsewhere.
 
D

Don Klipstein

Jan 1, 1970
0
Hey all;

I'm looking to replace a fuse in a piece of gear and it looks like a normal
fuse (you know, an inch and a half or so long glass cylinder aboiut 1/4" in
diameter) exept that there is a resistor in there. I've never seen this
before - can I just replace it with a standard fuse? What is the resistor
doing in there (limiting the AC current draw)?

I have seen such fuses before. If I remember correctly, they are slow
blow fuses. During prolonged moderate overcurrent, the fuse blows when
the resistor gets hot enough to melt a solder joint to it. For very
severe overcurrent the fuse blows from a wire melting or maybe the
resistor blowing. Look for a current rating on the fuse and chances are
you can use any old slow blow fuse of the same shape/dimensions and amp
rating.

- Don Klipstein ([email protected])
 
L

Luhan Monat

Jan 1, 1970
0
tempus said:
Hey all;

I'm looking to replace a fuse in a piece of gear and it looks like a normal
fuse (you know, an inch and a half or so long glass cylinder aboiut 1/4" in
diameter) exept that there is a resistor in there. I've never seen this
before - can I just replace it with a standard fuse? What is the resistor
doing in there (limiting the AC current draw)?

Thanks
Yo,

Although I have never seen this before, I have seen low value, low
power, resistors used as fuses. This sounds like such a thing put in a
tidy fuse container.

Since you want to replace it, I must assume that the resistor is no
longer readable. If you can still see the color bands, it is not yet
blown and your problem lies elsewhere.
 
M

Michael A. Terrell

Jan 1, 1970
0
tempus said:
Hey all;

I'm looking to replace a fuse in a piece of gear and it looks like a normal
fuse (you know, an inch and a half or so long glass cylinder aboiut 1/4" in
diameter) exept that there is a resistor in there. I've never seen this
before - can I just replace it with a standard fuse? What is the resistor
doing in there (limiting the AC current draw)?

Thanks

There should be a type and current rating stamped into the end caps,
along the sides. This is probably a low current fuse, and they can be
fairly expensive.

http://www.littelfuse.com/ and http://www.bussmann.com/ are two large
fuse manufacturers. They have plenty of information on fuses on their
websites, if you dig for it.
 
W

Watson A.Name - Watt Sun, Dark Remover

Jan 1, 1970
0
I have seen such fuses before. If I remember correctly, they are slow
blow fuses. During prolonged moderate overcurrent, the fuse blows when
the resistor gets hot enough to melt a solder joint to it. For very
severe overcurrent the fuse blows from a wire melting or maybe the
resistor blowing. Look for a current rating on the fuse and chances are
you can use any old slow blow fuse of the same shape/dimensions and amp
rating.

- Don Klipstein ([email protected])

I've seen those also. From memory, the resistor is a 51 ohm, and one
end is pulled on by a spring, so it will separate when the solder
melts. The fuse rating is something like 1/10 amp or 1/8 amp.

These were fairly common years ago, when size was not at such a
premium. But nowadays, everything has to shoehorn into a palm-sized
case, so they use Picofuses, which are about the size of a 1/4 or 1/8
watt resistor. And of course, since they're soldered in, replacing
them is much more difficult. (for the average Joe anyway..)

Or maybe that resistor was a 15 ohm. Depends on how one looks at it
quickly.. I'll have to check and see if I have an old fuse like
that laying around.

--
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###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
 
T

tempus fugit

Jan 1, 1970
0
The fuse is rated 3/16 A (?!?), and the resistor appears to be 900k (I can
still kind of make out the colours - white, brown, yellow).

thanks

 
L

Luhan Monat

Jan 1, 1970
0
tempus said:
The fuse is rated 3/16 A (?!?), and the resistor appears to be 900k (I can
still kind of make out the colours - white, brown, yellow).

Hi,

The 3/16 A looks probable, the 900k value is not. I would just replace
with an approximate slow-blow fuse rated at 1/4 amp. Fuses are not
super critical. Even the 'proper' value may not always work properly.
 
R

Ross Mac

Jan 1, 1970
0
Watson A.Name - Watt Sun said:
I've seen those also. From memory, the resistor is a 51 ohm, and one
end is pulled on by a spring, so it will separate when the solder
melts. The fuse rating is something like 1/10 amp or 1/8 amp.

These were fairly common years ago, when size was not at such a
premium. But nowadays, everything has to shoehorn into a palm-sized
case, so they use Picofuses, which are about the size of a 1/4 or 1/8
watt resistor. And of course, since they're soldered in, replacing
them is much more difficult. (for the average Joe anyway..)

Or maybe that resistor was a 15 ohm. Depends on how one looks at it
quickly.. I'll have to check and see if I have an old fuse like
that laying around.

--
@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@

Ah yes, the pico fuse....I sat in engineering more than once when the
maintenance people would come in looking for a zero ohm
resistor....hehehe...we always got a chuckle out of that one!
 
R

Ross Mac

Jan 1, 1970
0
tempus fugit said:
The fuse is rated 3/16 A (?!?), and the resistor appears to be 900k (I can
still kind of make out the colours - white, brown, yellow).

thanks

Watson A.Name - Watt Sun said:
Just replace it with another 3/16 amp fuse with the same time delay...there
should be a designation on it you can cross on google and whether the
resistor is there or not, it shouldn't matter as long as it is the same
spec. I used to see those types of fuses in 1/16 values quite often. They
were common 10 or more years ago...(who knows maybe 20...time passes
quickly!).....
 
M

Michael A. Terrell

Jan 1, 1970
0
Ross said:
Ah yes, the pico fuse....I sat in engineering more than once when the
maintenance people would come in looking for a zero ohm
resistor....hehehe...we always got a chuckle out of that one!

You mean you've never used a zero ohm resistor? they are very useful
for bypassing an unused attenuator on a surface mount PC board. BTW,
they come in 5% and 1% versions ;-)
 
T

tempus fugit

Jan 1, 1970
0
Thanks Luhan. That's kind of what I figured.
 
R

Ross Mac

Jan 1, 1970
0
Michael A. Terrell said:
You mean you've never used a zero ohm resistor? they are very useful
for bypassing an unused attenuator on a surface mount PC board. BTW,
they come in 5% and 1% versions ;-)
--


Michael A. Terrell
Central Florida
Not too many that looked like pico fuses!
I do remember seeing zero ohm resistors or jumpers used on single sided
boards. I think they did that so they could auto insert the part. A plain
wire would not be so easy to auto insert!....take care Mike and where do you
live in Central Florida? We were considering relocating to that area.....
 
M

Michael A. Terrell

Jan 1, 1970
0
Ross said:
Not too many that looked like pico fuses!
I do remember seeing zero ohm resistors or jumpers used on single sided
boards. I think they did that so they could auto insert the part. A plain
wire would not be so easy to auto insert!....take care Mike and where do you
live in Central Florida? We were considering relocating to that area.....

I live between Ocala and Belleview.
 
R

Ross Mac

Jan 1, 1970
0
Michael A. Terrell said:
area.....

I live between Ocala and Belleview.
--


Michael A. Terrell
Central Florida
That's amazing because we were looking to move to the Ocala / Silver Springs
area.....I won't ask if you like it...you must!....Any
suggestions???....thanks for the reply...Ross
 
K

Keith R. Williams

Jan 1, 1970
0
Not too many that looked like pico fuses!
I do remember seeing zero ohm resistors or jumpers used on single sided
boards. I think they did that so they could auto insert the part.

I've seen them used for configuration ties too. ...same reason
wires aren't used, with the addition that they look like they're
needed for operation (harder to circumvent the design).

<snipped the yucky Florida stuff - though we had snow last night>
 
M

Michael A. Terrell

Jan 1, 1970
0
Ross said:
That's amazing because we were looking to move to the Ocala / Silver Springs
area.....I won't ask if you like it...you must!....Any
suggestions???....thanks for the reply...Ross

The Ocala area is nice. You don't have the typical Florida sand all
over, there are plenty of oak trees, and the town is a mix of old and
new buildings. The roads are mostly decent, and slowly getting better.
The only thing I don't like is that there is no electronics distributors
between Orlando and Jacksonville, unless they are hiding from me.

One think to be sure of: have a good title search on any property you
want to buy, and if there is land involved, you might want to use a
lawyer rather than a realtor to make sure everything is done right. If
you are going to be in the area looking it over you can E-mail me and I
will give you my phone number and address.

I live in an older subdivision near Belleview, with the "Greenbelt"
running right behind the property. It was originally to be used to build
a canal across the state for NASA to bring things from the gulf to the
cape, but it was never completed.

BTW, the old "Tarzan" movies were filmed in Silver Springs.
 
M

Michael A. Terrell

Jan 1, 1970
0
Keith R. Williams said:
I've seen them used for configuration ties too. ...same reason
wires aren't used, with the addition that they look like they're
needed for operation (harder to circumvent the design).

<snipped the yucky Florida stuff - though we had snow last night>

It was 39 degrees in Ocala this morning. Not quite cold enough to
snow, but it felt great!
 
R

Ross Mac

Jan 1, 1970
0
Michael A. Terrell said:
The Ocala area is nice. You don't have the typical Florida sand all
over, there are plenty of oak trees, and the town is a mix of old and
new buildings. The roads are mostly decent, and slowly getting better.
The only thing I don't like is that there is no electronics distributors
between Orlando and Jacksonville, unless they are hiding from me.

One think to be sure of: have a good title search on any property you
want to buy, and if there is land involved, you might want to use a
lawyer rather than a realtor to make sure everything is done right. If
you are going to be in the area looking it over you can E-mail me and I
will give you my phone number and address.

I live in an older subdivision near Belleview, with the "Greenbelt"
running right behind the property. It was originally to be used to build
a canal across the state for NASA to bring things from the gulf to the
cape, but it was never completed.

BTW, the old "Tarzan" movies were filmed in Silver Springs.
--


Michael A. Terrell
Central Florida
Thanks Mike, we will be looking this spring....have to sell a California
house first!....thanks again, Ross
 
K

Keith R. Williams

Jan 1, 1970
0
It was 39 degrees in Ocala this morning. Not quite cold enough to
snow, but it felt great!

That's getting down there for Florida in November. It was 23F
this morning and 36F now at 3:20PM. That should be about the
high, since the sun will be setting in about an hour. :-(
 
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