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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.


  • 0

    Zoomup:

    I believe that the blades on the square section rotating shafts have to be manually set for correct operation. A new shaft with affixed blades from one fused switch may not work correctly in another fused switch of the same catalogue number. I did notice that after lubrication the ON indicator flag showed correctly in the observation window, before lubrication it seemed not to be fully showing, and a part of the OFF indicator was showing, indicating that perhaps the switch was not fully closed.




    IIRC, the mechanism is set in the factory and should not need to be adjusted subsequently.


    The tightening torque for the cable terminals in the current model is 25 Nm and my experience (of a smaller model) was that one has to be careful not to allow the contacts to twist out of alignment.

  • 0

    Chris Pearson:




    Zoomup:

    I believe that the blades on the square section rotating shafts have to be manually set for correct operation. A new shaft with affixed blades from one fused switch may not work correctly in another fused switch of the same catalogue number. I did notice that after lubrication the ON indicator flag showed correctly in the observation window, before lubrication it seemed not to be fully showing, and a part of the OFF indicator was showing, indicating that perhaps the switch was not fully closed.




    IIRC, the mechanism is set in the factory and should not need to be adjusted subsequently.


    The tightening torque for the cable terminals in the current model is 25 Nm and my experience (of a smaller model) was that one has to be careful not to allow the contacts to twist out of alignment.


     




    Indeed yes.


    Z.

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