Login Join Maker Pro

# DoesThis Exist? Thermally Coupled Fuses

D

#### D from BC

Jan 1, 1970
0
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.
D from BC

E

#### Eeyore

Jan 1, 1970
0
D said:
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Ciruit breaker ?

Graham

J

#### John Barrett

Jan 1, 1970
0
D from BC said:
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.
D from BC

I dont know of a way to do it thermally -- are you sure you want to
deliberatly burn something ?? but plenty of ways to do it electronically

NC thermal switch driving a relay ?? relay inline on B driven by A.. i.e.
when A blows, it interrupts the current to the coil, opening the relay on B
??

Use 2 breakers ganged ??

dont know what the A circuit has on it -- a little more info pls ??

D

#### D from BC

Jan 1, 1970
0
Ciruit breaker ?

Graham

Oh yeah... I've seen electrical box breakers ganged together with a
clip. If one breaker trips..it takes out the other breaker...
Can I can get that in the 1A to 5A range..??
I neglected to mention the fuse rating of interest in my OP.
oops...
D from BC

S

Jan 1, 1970
0
D from BC said:
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.
D from BC

Could you use a striker fuse? They have a shaft that pushes out when the
fuse blows, that shaft usually is used to activate a microswitch.

R

#### Rich Grise

Jan 1, 1970
0
Ciruit breaker ?

Oh yeah... I've seen electrical box breakers ganged together with a clip.
If one breaker trips..it takes out the other breaker... Can I can get that
in the 1A to 5A range..?? I neglected to mention the fuse rating of
interest in my OP. oops...[/QUOTE]

Digi-key has some, for about US$30-US$50 =:-O

But they're out there somewhere.

You _could_ get a couple of breakers and gang them with a piece of
plastic and some glue.

Good Luck!
Rich

R

#### Rich Grise

Jan 1, 1970
0
Could you use a striker fuse? They have a shaft that pushes out when the
fuse blows, that shaft usually is used to activate a microswitch.

Aim it at the other fuse's fuseholder, to pop it out when the first
one blows. ;-)

Cheers!
Rich

D

#### D from BC

Jan 1, 1970
0
I dont know of a way to do it thermally -- are you sure you want to
deliberatly burn something ?? but plenty of ways to do it electronically

NC thermal switch driving a relay ?? relay inline on B driven by A.. i.e.
when A blows, it interrupts the current to the coil, opening the relay on B
??

Use 2 breakers ganged ??

dont know what the A circuit has on it -- a little more info pls ??

I'm just curious if such a nonresettable fuse exists..
It might be a part that could exist but is not in production.
If it does exist...it probably would be about 5mmx10mm in size and be
slow blow.
I just came up with the idea while working on some failsafe circuits.
D from BC

D

#### D from BC

Jan 1, 1970
0
Could you use a striker fuse? They have a shaft that pushes out when the
fuse blows, that shaft usually is used to activate a microswitch.

wow...that's something I haven't heard of...

However..I forgot to mention in my OP that small size is of interest.
Small like those fuses that look like resistors..
Also a 1A to 5A rating...
D from BC

D

#### D from BC

Jan 1, 1970
0
Aim it at the other fuse's fuseholder, to pop it out when the first
one blows. ;-)

Cheers!
Rich

lol
D from BC

M

#### maxfoo

Jan 1, 1970
0
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.
D from BC

Have the 1st circuit fire a scr that blows the 2nd fuse.

R

Jan 1, 1970
0
D from BC said:
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.

You might be able to do something like that with polyswitches. I think
Raychem has some notes in thermally coupling them to improve
parallelism. You'd have to experiment find what happens to the trip
point, these are thermal devices so coupling them to another thermal
mass will raise the trip point. I'm not sure I'd want to use it for
significant voltage isolation, you'd need to check voltage isolation and

Robert

D

#### D from BC

Jan 1, 1970
0
Have the 1st circuit fire a scr that blows the 2nd fuse.

I wonder if that could get tricky if one needed lots of isolation
between the cct with fuse 1 and the cct with fuse 2.
D from BC

R

#### Robert Baer

Jan 1, 1970
0
D said:
I wonder if that could get tricky if one needed lots of isolation
between the cct with fuse 1 and the cct with fuse 2.
D from BC
Use gunpowder or an azide for that ignition and burning...

M

#### maxfoo

Jan 1, 1970
0
trigger the scr with an optocoupler on most scr's Vgt is less than 1volt.
Use gunpowder or an azide for that ignition and burning...

SCR = 'solid combustible rocket' ummmm OKay...please post on youtube.

R

#### Ross Herbert

Jan 1, 1970
0
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.
D from BC

In the telephony world there are fuses which have a spring loaded
plunger which is retained by the fuse wire in normal operation. When
the fuse is ruptured due to overload the plunger is released to
operate a contact which can then b used to initiate an alarm. You
could use this alarm contact to perform any desired action subsequent
to the fuse operating. Many different manufacturesrs will have their
own designs and styles but here is the pdf for one type from a
Japanese manufacturer;
http://www.daitotusin.co.jp/english/contents/c_j/pdf/E_P4_PL4_P3_PL3F.pdf

M

#### maxfoo

Jan 1, 1970
0
I wonder if that could get tricky if one needed lots of isolation
between the cct with fuse 1 and the cct with fuse 2.
D from BC

A Photoscr (4n39) or a phototriac would give you isolation. Try Vishay, they may
even have appnotes on what you're trying to accomplish.

S

Jan 1, 1970
0
D from BC said:
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

Since metal can't be used to couple the fuses together (isolation
wanted) maybe fuse A can ignite a non conducting dry chemical to burn
out fuse B.
D from BC

Could you use a striker fuse? They have a shaft that pushes out when the
fuse blows, that shaft usually is used to activate a microswitch.

P

#### Phil Allison

Jan 1, 1970
0
"D from BC" <
Does this exist?

It's kinda like an optocoupler but only with fuses.
An input fuse and output fuse that's thermally coupled.
Or in other words...
A device that has two isolated fuses yet share the same heat.
When fuse A blows, it also blows fuse B or vice versa..

** Sure.

You just have to get a couple of fuses that are paid up members

of the " Amalgamated Fuse and Circuit Breakers Union " .

This is their motto :

" One Out - All Out "

....... Phil

E

#### ehsjr

Jan 1, 1970
0
D said:
wow...that's something I haven't heard of...

However..I forgot to mention in my OP that small size is of interest.
Small like those fuses that look like resistors..
Also a 1A to 5A rating...
D from BC

Does that mean that cams and gears and belcranks
and linkages and solenoids, all connected together
to operate a 5 pound rubber mallet to smash the other
fuse when the first one blows, are out?

But seriously - can you gate the supply to the
second fuse with a mosfet only when voltage is available
from the first fuse?

Ed

Replies
3
Views
604
Replies
6
Views
4K
Replies
3
Views
732
Replies
2
Views
532
Replies
11
Views
1K