Whats this fused thing on din rail
- Thread starter Mike2007
- Start date
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It could be a fuse
Looks like it has come from some equipment that suffered fire or over heating damage
Looks like it has come from some equipment that suffered fire or over heating damage
it seems to be a DIN rail fuse holder.
https://uk.rs-online.com/web/p/rail-mount-fuse-holders/0501809
No idea why they are used rather than an MCB though.
https://uk.rs-online.com/web/p/rail-mount-fuse-holders/0501809
No idea why they are used rather than an MCB though.
They can be fitted with slow blow fuses for loads that have in-rush / transient currents that would trip the magnetic part of an MCB
Also they take up less space than an MCB
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They are also a bit cheaper, which matters if you have a lot.
When I worked in telecomms I noticed the racks had great long DIN rails full of fuses, with one 6A MCB feeding the rest of the rail.
Probability of anything ever blowing was very slight, so the manpower cost of changing a fuse was negligible.
But not impossible.
Only in exceptional circumstances (about never) would the MCB trip.
When I worked in telecomms I noticed the racks had great long DIN rails full of fuses, with one 6A MCB feeding the rest of the rail.
Probability of anything ever blowing was very slight, so the manpower cost of changing a fuse was negligible.
But not impossible.
Only in exceptional circumstances (about never) would the MCB trip.
so later than when Strowger ruled and a jammed selector mechanism would take out the fuse. Either that or the solenoid coils burnt out.
The ubiquitous Fuse type 44A which when blown closed it's alarm contact to wake up the exchange technician to fix the problem.
Those springy 'signalling" fuses were great things. We used them offshore on F&G and ESD systems. Took me quite a while to source replacements; eventually got them from a company supplying Network Rail, so I presume were also used for track signalling systems. When you have a cabinet stuffed with literally hundreds of them, you can see in an instant which one has let go by its spring connector sticking up.so later than when Strowger ruled and a jammed selector mechanism would take out the fuse. Either that or the solenoid coils burnt out.
The ubiquitous Fuse type 44A which when blown closed it's alarm contact to wake up the exchange technician to fix the problem.
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