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Unusual MCB

Here's an interesting one.

Federal Electric 20A MCB. Had no type on it and was taking a long time to trip. Opened one up and discovered why it didn't have a type.

Others with it were ECC but virtually the same design. Only thermal. Both are plug in types called stab-lok and are bakerlite.


No instantaneous trip mechanism. Only a thermal one.



34200b5e07a12e120f5fc679b8b1b9aa-huge-mcb-with-no-instantanious-trip-mechanism-4.jpg
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  • Sparkymania:

    Looking at the others on ebay I thought the colour may have some significance too as they have a label on the front stating the type so I would say they do have a magnetic mechanism.

    However, some of the black toggled ones also have a type stated on the front as well so I would say the coloured ones are all later ones and they started making them with magnetic mechanisms first with the black toggles before colouring them.


    I still couldn't find an RCBO with a type stated on the front or on the sides (from the ones with side pics) so that still begs the question as to whether these RCBOs have a magnetic mechanism.

     


    As far as I can see, the ones with the green toggles are type 2, the orange ones type 3, and the black ones type 4. If there is no type written on the device, it seems reasonable to assume that they have no magnetic trip mechanism.


Reply
  • Sparkymania:

    Looking at the others on ebay I thought the colour may have some significance too as they have a label on the front stating the type so I would say they do have a magnetic mechanism.

    However, some of the black toggled ones also have a type stated on the front as well so I would say the coloured ones are all later ones and they started making them with magnetic mechanisms first with the black toggles before colouring them.


    I still couldn't find an RCBO with a type stated on the front or on the sides (from the ones with side pics) so that still begs the question as to whether these RCBOs have a magnetic mechanism.

     


    As far as I can see, the ones with the green toggles are type 2, the orange ones type 3, and the black ones type 4. If there is no type written on the device, it seems reasonable to assume that they have no magnetic trip mechanism.


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