NotJustin Posted December 16, 2021 Share Posted December 16, 2021 Hi all I have a consumer unit for my peak supply and a one for my off peak. The MCB's are different, the peak has MCBs with a terminal to the back of the MCB into the fixed busbar and the off peak box has a floating busbar underneath the MCBs, so the MCBs are different in both. I don't understand why they are different, or what the difference is called, they are all type B MCBs, I'm sure of that. I need another one for my off peak box but I don't know what to order for the variation. Thanks for any ideas, Justin Link to comment Share on other sites More sharing options...
ProDave Posted December 16, 2021 Share Posted December 16, 2021 Just different makes, or even the same make but a different type. Your peak CU is a plug in type, probably Crabtree they were the most popular of the plug in ones for a while. The off peak is a more "normal" type. It's a shame the form factor of MCB's is not more standardises. Neither is right or wrong, just different, Post a picture of the type you are looking for. Typical plug in type https://www.screwfix.com/p/crabtree-starbreaker-16a-sp-type-b-mcb/98018 Typical normal one of the same make https://www.screwfix.com/p/crabtree-loadstar-16a-sp-type-b-mcb/189jt Link to comment Share on other sites More sharing options...
Carrerahill Posted December 16, 2021 Share Posted December 16, 2021 Photo please, make and manufacturer, type B, C... has no impact on the physical shape and size just the breaking characteristics. Could it be that the manufacturer has altered the styles and you have an earlier and later one. Wylex changed theirs a year or so ago and the old ones will fit the new, but the new not the old, but the old boards are no longer sold so shouldn't be a big issue. Things like that. Link to comment Share on other sites More sharing options...
NotJustin Posted December 16, 2021 Author Share Posted December 16, 2021 (edited) 14 minutes ago, ProDave said: Just different makes, or even the same make but a different type. Your peak CU is a plug in type, probably Crabtree they were the most popular of the plug in ones for a while. The off peak is a more "normal" type. It's a shame the form factor of MCB's is not more standardises. Neither is right or wrong, just different, Post a picture of the type you are looking for. Yes, the main box is a Crabtree. The pictured MCB is a Hager from the off peak box. I need a 50a one. The Crabtree was here when we arrived and the off peak box added a couple of years ago. Edited December 16, 2021 by NotJustin Link to comment Share on other sites More sharing options...
Onoff Posted December 16, 2021 Share Posted December 16, 2021 You need a 50A Hager mcb? Probably <£5 on Amazon etc. MTN 1** B**"? Is this what the rest are. Where in the case of a 50A, ** = 50. Link to comment Share on other sites More sharing options...
NotJustin Posted December 16, 2021 Author Share Posted December 16, 2021 (edited) This is probably what I need? https://www.toolstation.com/protek-single-pole-mcb-10ka-type-b/p38965 Edited December 16, 2021 by NotJustin Link to comment Share on other sites More sharing options...
ProDave Posted December 16, 2021 Share Posted December 16, 2021 4 minutes ago, NotJustin said: This is probably what in need? https://www.toolstation.com/protek-single-pole-mcb-10ka-type-b/p38965 NO NO NO It MUST be the same make. that one will probably not fit Screweys and TS don't stock Hager. Here is one https://www.ebay.co.uk/itm/124928773232?hash=item1d1655cc70%3Ag%3Aa3EAAOSwzCBhVwwK&LH_ItemCondition=1000 Link to comment Share on other sites More sharing options...
Onoff Posted December 16, 2021 Share Posted December 16, 2021 Do you have an electrical wholesaler near you? Won't get Hager in SF or TS. For example: https://www.cef.co.uk/catalogue/products/42519-50a-sp-6ka-type-b-mcb? Link to comment Share on other sites More sharing options...
Onoff Posted December 16, 2021 Share Posted December 16, 2021 Probably a fiver on top for delivery: https://www.tlc-direct.co.uk/Products/HGMT150.html? Link to comment Share on other sites More sharing options...
NotJustin Posted December 16, 2021 Author Share Posted December 16, 2021 19 minutes ago, ProDave said: NO NO NO It MUST be the same make. that one will probably not fit Screweys and TS don't stock Hager. Here is one https://www.ebay.co.uk/itm/124928773232?hash=item1d1655cc70%3Ag%3Aa3EAAOSwzCBhVwwK&LH_ItemCondition=1000 Brilliant, thank you Link to comment Share on other sites More sharing options...
NotJustin Posted December 16, 2021 Author Share Posted December 16, 2021 Ah, had another look at the board and they are MK make! The Hager was floating about ontop of the box. Link to comment Share on other sites More sharing options...
NotJustin Posted December 16, 2021 Author Share Posted December 16, 2021 Link to comment Share on other sites More sharing options...
Onoff Posted December 16, 2021 Share Posted December 16, 2021 I'll go look at what I've got lying around in the shed/garage in a mo. For hard to get, older MCBs etc I've used this lot before: https://www.reconelectrical.co.uk/reconditioned-circuit-breakers.html Link to comment Share on other sites More sharing options...
ProDave Posted December 16, 2021 Share Posted December 16, 2021 Here you go https://www.toolstation.com/mk-mcb/p21565 Edit: One of the reasons I HATE MK, old ones and new ones look completely different. That's why I like Hager so much, they just stick to a design and a new mcb in an old board still matches. P.S Thats a bitsa consumer unit, that is not an MK main switch. Link to comment Share on other sites More sharing options...
NotJustin Posted December 16, 2021 Author Share Posted December 16, 2021 (edited) 12 minutes ago, ProDave said: Here you go https://www.toolstation.com/mk-mcb/p21565 Edit: One of the reasons I HATE MK, old ones and new ones look completely different. That's why I like Hager so much, they just stick to a design and a new mcb in an old board still matches. P.S Thats a bitsa consumer unit, that is not an MK main switch. Yes, the one at Toolstation is out of stock, proably now the old one. Screwfix have one, different design: https://www.screwfix.com/p/mk-sentry-50a-sp-type-b-mcb/954kp I think the Hager would fit, that's why the electrician left it. So all ages of MK would fit? I'm really thinking of getting a new off peak board as this one is too small anyway, need to add three more slots. Edited December 16, 2021 by NotJustin Link to comment Share on other sites More sharing options...
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