Rated to 63 amp?

[QSGAZ]

I have to put a new sub board in, the problem i have is the installation that i need to get a feed from is 20 years old. My question is, the fork connectors that come from the busbar to the mcb, is it rated to take 63a?

 

[Knobhead]

Are you saying that the above MCB board is a DC supplied board??

I hope not, those MCBs as far as my recollection, aren't DC rated by MG!!

MG only rate them to 440V AC so there could be an inherent fault in the whole system.
That being said we don’t know what the DC voltage is.

 

[QSGAZ]

We buy most of our equipment straight from the main dealers so all the breakers we buy are for DC, the board your looking at is custom built (again along time ago). I cant double them up because i dont have enough forks to double them up with. All truth be told all i want to know is, where can i get these forks from and will they be rated to 63Amp. dont worry about the rest of the installation.
Cheers for all your feed back and your help

 

[Engineer54]

We buy most of our equipment straight from the main dealers so all the breakers we buy are for DC, the board your looking at is custom built (again along time ago). I cant double them up because i dont have enough forks to double them up with. All truth be told all i want to know is, where can i get these forks from and will they be rated to 63Amp. dont worry about the rest of the installation.
Cheers for all your feed back and your help

What do you mean, ''never mind the quality feel the width''??

I've worked with MG breakers now for a good number of years, and as far as i remember those MG breaker designation numbers you show, are not certified for DC protection... I may be wrong, but i don't think so!!!

 

[QSGAZ]

Hello Engineer54.
Can you tell me the difference from a dc breaker to an ac breaker? we work directly with schneider electric. dont forget the custom fit board is at least 10 years old.

 

[Engineer54]

All to do with coil winding of the instantaneous tip switch gaps arch gaps, arch suppression etc.... But MG and other manufactures always stipulate very clearly if an MCB is suitable/certified to operate on DC current circuits.

As an observation over the years, they tend to be wider or fatter than AC only MCBs....

 

[technospark]

These look like standard Merlin Gerin forks from the 1970s/80s From memory they did breakers up to 50 amps which connected with these forks so might be OK for 63 amps.
Might be worth seeing if your supplier has an old M.G. catalog & spec book

 

[telectrix]

As an observation over the years, they tend to be wider or fatter than AC only MCBs....

just like the rest of us. wider and fatter over the years. LOL.

 

[QSGAZ]

the c60 fuses are good for dc . the other mcbs ( the c45n) are being replace with the c60hb fuses anyway that will will work as the table below shows.

 

[HandySparks]

If it was just a one-off, I think that I'd make my own fork from a bit of copper bus bar. Shouldn't take too long with hacksaw and drill. Doesn't need to be as nicely shaped as the others. If you need a few, a local small engineering company would make them to a sketch. More expensive than off the shelf, of course (if you coud find any).

 

[QSGAZ]

Yeah we own a fabrication buisness but just dont know if this will be a one off. a price comparison would help, ive looked everywhere for something similar but no success