On the search for mk rcbo.....

[littlespark]

....To fit old Sentry board.

Present board has 80A, 30mA RCD mainswitch, and it’s a 16 way board!!

I can’t get all circuits to stay on all at once. Have to leave any one of 3 lighting circuits off for rcd to hold.
Individually they work fine.

Accumulative earth leak between all circuits, dropping out the rcd which when ramp tested tripped at 19mA.
Have recommended changing all breakers to rcbo, and normal mainswitch. Either find RCBOs to replace, or all new board.
The old mcbs model numbers are. LN 5906, or 5916 etc.
Do new mk rcbo’s fit this old board?
Homebase are still selling their MK stock off cheap

 

[westward10]

MK made retro kits for new devices to fit the old LN range but they are as rare as chickens teeth. It would be cheaper and easier to replace the board.

 

[littlespark]

MK made retro kits for new devices to fit the old LN range but they are as rare as chickens teeth. It would be cheaper and easier to replace the board.

That was my thinking.... new board.

Is the LN range standard DIN rail mounted?
I could just get the rcbo’s and a length of busbar. Save taking all the cables out that are neatly clipped top entry.

 

[westward10]

You would end up with non compatible parts to the original enclosure. I wouldn't have thought it worth the grief.

 

[littlespark]

You would end up with non compatible parts to the original enclosure. I wouldn't have thought it worth the grief.

Even newer MK devices?
I suppose, they might fit the din rail fine, but be too deep for the cover to go back on or the lid to close.

I’ll go with an all new board. Will be cheaper anyway.

 

[Andy78]

From memory, if the older LN breaker has an "s" suffix they are compatible with newer ones, eg 5906s.
If not it's probably time to update.

 

[littlespark]

This is the main rcd and first few breakers.
Don’t see an “s” suffix

 

[Andy78]

This is the main rcd and first few breakers.
Don’t see an “s” suffix

View attachment 54393

Nah that's the older stuff that's not compatible. I'm working with one on an occupied rewire at the moment. someone has actually fitted a modern sentry breaker, but it's definitely not a legit fit. It's bodged in with a flying lead off the busbar.

 

[DT1991]

Dont they have enough showers Haha

 

[Andy78]

Dont they have enough showers Haha

Weird, the one I'm doing also has three showers, one of them a power shower though.

 

[littlespark]

Yes. 3 shower circuits. I don’t know why... oil fired central heating, surely they can get hot water from it too.

It’s a sprawling barn conversion. Rewired in bits over the years. Shower in the “guest wing” I believe.

 

[freddo]

RCBOs were never common for these boards. I've only ever seen a few, 2 of which I have here somewhere, for some reason.

 

[littlespark]

I popped over to my wholesalers this morning to price up a new board. YESSS are now stocking Fusebox brand, which should save a few quid.

 

[davesparks]

Nah that's the older stuff that's not compatible. I'm working with one on an occupied rewire at the moment. someone has actually fitted a modern sentry breaker, but it's definitely not a legit fit. It's bodged in with a flying lead off the busbar.

MK did make a retrofit kit to allow new breakers to be fitted in to the old boards, so if it's a properly made flylead then it may be legit.

 

[Andy78]

MK did make a retrofit kit to allow new breakers to be fitted in to the old boards, so if it's a properly made flylead then it may be legit.

Ah, didn't know that. I'll have a look next week.

 

[davesparks]

Ah, didn't know that. I'll have a look next week.

Part number 5567s it's discontinued now as far as I know.

 

[westward10]

That is them. As I said rare as hens teeth.

 

[freddo]

Not worth bothering with now, better to renew the CU to something with easily available parts.

 

[Andy78]

Yep, turns out it was a proper kit. And whoever put it in had some fun in there

 

[DT1991]

Good photos Andy.

Is that thermal damage from a failed attempt previous or the kit itself failing now?

Edit : I didn't look at the photos of the metal case damage. Duh!!!