fuses with a push button reset

[YTSOxford]

Hi, I remember at college I was told that if you see old resettable cartridge fuses (the ones where a button pops out) to replace them - but I can't remember the reasons why??? I just said that they no longer comply to my customer but what actually is the reason? I hate not knowing and talking rubish!

And anyone know the BS number of these so I can put it in the quote?

Cheers.

 

[Jason Smith]

Have a load on the van mate and will have you are your answer if no one lse can by tomorrow.
If you do change the box out, keep the button fuses, they plug into rewireable boards a treat for when you fault finding!!

 

[DurhamSparky]

yeah the Number is "BS OUT of DATE...."

not sure mate some bdy will pop up though

bs number of the new MCB flick switches is 60898

 

[YTSOxford]

yeah the Number is "BS OUT of DATE...."

not sure mate some bdy will pop up though

bs number of the new MCB flick switches is 60898

Yeah cheers mate, thats pretty much what I said to the bloke.

 

[Notsosmart]

I think you are talking about the old wylex MCB's (fuses are not resetable, once they have blown a new one is required) if so the bs number was; Bs3871 generally they only had a short circuit capacity of 1 or 2KA (M1 or M2)

 

[DurhamSparky]

quick google check show me that they are indeed BS3871 type 2

 

[YTSOxford]

I think you are talking about the old wylex MCB's (fuses are not resetable, once they have blown a new one is required) if so the bs number was; Bs3871 generally they only had a short circuit capacity of 1 or 2KA (M1 or M2)

Cheers, I can't tell from the pictures if that is the breaker, but the small short circuit capacity is ringing a bell - so I think thats it.

 

[pevvers]

You lot are way too quick for my likings tonight...

Yep, 3871's. As far as I recall depending on the rating the breaking capacity was different. I think 5A were rated at 1 or 1.5kA, and the rest at 3 or 3.5kA, but it is clearly marked on the label or embossment (if there is such a word!) on the side....

Also, I seem to remember that there was a problem with the devices getting stuck closed due to the design.

 

[ian.settle1]

Some fuses have a pop out but this is to indicate the fuse has blown not a reset.

 

[MWE]

Hi anybody tell me if old rewireable fuses and old bs3871's push button type and mcb's are all allowed within the same board (old wylex type)