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Old Glasgow Excel 200 Amp. 3 Phase fused switch.

Zoomup
Evnin' all,

                       I have a holiday chalet park with about 80+ chalets on it that I am responsible for electrically. In the main intake room there is a Delta 657 that supplies the Glasgow Excel 200 Amp three phase fused switch. I went to lubricate it today. It has a retracting handle and is very mechanical inside, with a flag that shows ON or OFF through a little window. The red phase fuse seems to be original, as is the yellow phase fuse. The blue phase fuse has been replaced at some point in time and seems newer than the other two. (Busmann DD200.)


Now what I noticed is that the fingers on the blue phase switch blades are damaged and burnt back by a mm or two. It appears that the switch has been opened on a heavy load, or that the contacts are deteriorating due to additional loads being added. Did the old fuse blow due to overheating of the contacts, or are the contacts damaged due to the fuse getting hot? Who knows?


Can we still get spare parts for this fused switch?


Thanks,


Z.


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  • 0

    Zoomup:

    I did have a look at the fixed contacts but they are mostly hidden by porcelain insulation "blocks" and are difficult to see.  I didn't look too deeply though as I can not see a way to disconnect the incoming supply which comes from the Delta unit mentioned above. The ends of the fingers are definitely eaten away and I am concerned about the reliability of the blue phase switch. The other two are as good as new.




    Zoomup, is that the fingers on both the supply and load sides of the fuse carrier?


    I think that the female side of the contacts have to be inspected - it seems most unlikely that the fingers could be eroded, but not the other side of the contacts.


    I don't see any alternative to getting the fuses pulled so that you can get the shield off and have a proper look.

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  • 0

    Zoomup:

    I did have a look at the fixed contacts but they are mostly hidden by porcelain insulation "blocks" and are difficult to see.  I didn't look too deeply though as I can not see a way to disconnect the incoming supply which comes from the Delta unit mentioned above. The ends of the fingers are definitely eaten away and I am concerned about the reliability of the blue phase switch. The other two are as good as new.




    Zoomup, is that the fingers on both the supply and load sides of the fuse carrier?


    I think that the female side of the contacts have to be inspected - it seems most unlikely that the fingers could be eroded, but not the other side of the contacts.


    I don't see any alternative to getting the fuses pulled so that you can get the shield off and have a proper look.

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