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NVR switch failures ... why?

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hermetic:
From your description of the fault it sounds like the relay pulls in, the machine starts, and stops again as soon as you release the start button? If this is so it sounds like the holding in (maintaining) contact is not making. Is this something you can get inside or is it all sealed? Pics? Went to fit a new NVR starter on my mates 3 phase ingersoll rand compressor, he took me to his local electrical wholesaler, and we got one, £45-00 plus the vat................made in India, worked ok and still is working, but a very small plastic enclosure that made wiring the thing very difficult. Found them later on Alibaba, fob price for the starter is $4-00 each.

John Swift:
the budget no volt release switches are nothing like the direct on line starters we think of

if  I have interpreted  the diagram correctly the coil is wired across the output  of a 2 pole switch

the green start button pushes the  switch  closed and the solenoid then holds it closed until
you force it open by pushing the red stop button  :bugeye:

thinking of the early  demise of the switch
 if the mains is too low at the end of the 40 meters of cable
the solenoid may not hold the contacts closed with enough pressure to ensure they make a good low resistance connection



    John

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