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Unusual MCB

Sparkymania
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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    Hard to believe these were manufactured in 1988 without the inclusion of an instantaneous trip mechanism.

    I see what you mean about their liking the bakerlite look. I've seen UK Fed Electric made MCBs to fit in these DBs but made of white plastic. They are totally different internally and therefore narrower. However, if you look at them side on they are padded out to be the same width. They must have made them to allow the continued use of their old DBs.

    Interesting read about electronic verses electromechanical.

    It's still strange that FE stopped making the stablock MCBs with no instantaneous trip and started to make (and mark) them as types 1, 2, 3 & 4 but didn't do the same with the RCBOs.
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  • 0
    Hard to believe these were manufactured in 1988 without the inclusion of an instantaneous trip mechanism.

    I see what you mean about their liking the bakerlite look. I've seen UK Fed Electric made MCBs to fit in these DBs but made of white plastic. They are totally different internally and therefore narrower. However, if you look at them side on they are padded out to be the same width. They must have made them to allow the continued use of their old DBs.

    Interesting read about electronic verses electromechanical.

    It's still strange that FE stopped making the stablock MCBs with no instantaneous trip and started to make (and mark) them as types 1, 2, 3 & 4 but didn't do the same with the RCBOs.
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