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Lighting Controller Repair.

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I ordered some new triacs from fleabay. The are type BTA08-600B. The seller said that they were suitable for an N.J.D. lighting controller repair, amongst others. So I fitted one. I had fitted a new 20mm H.R.C. 6.3 Amp fuse inside the controller replacing the old glass one. I had the lid off the controller but decided to turn it over, just in case, before I powered it up. BANG. The internal  6.3 fuse Amp blew and the supply socket R.C.D. tripped off. The 5 Amp plug fuse remained intact.


The reason?


The device did not have an isolated heat sink tab so a L to E fault occurred on the common earthed aluminium heat sink, the controller has four triacs. Thank heavens for the H.R.C. fuse which physically did not shatter.


I told the seller about this so that others can be warned. Some triacs are isolated some not.


Z.
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  • 0
    AdrianWint:

    Are you sure they are BTA08-600B ?


    The BTB08-600B is a non isolated tab 8A 600V device, the BTA08-600B is its insulated cousin. The trailing 'B' tells you about the gate sensitivity.


    Like you, I found out the hardway, years ago, about the different varieties of TRIACs, ironically also fixing NJD controllers (NJD = New Junction Discotheques, - those controllers where made in Sandiacre, Nottingham... about 5 miles from where I type this)




     


    Hello Adrian, yes definitely marked BTA08-600B. The centre pin connects to the heat sink tab. Perhaps they are wrongly marked or a sub-standard faulty batch? I have used N.J.D. stuff for years, although its design is a bit antiquated nowadays. But I like retro!


    Z.


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  • 0
    AdrianWint:

    Are you sure they are BTA08-600B ?


    The BTB08-600B is a non isolated tab 8A 600V device, the BTA08-600B is its insulated cousin. The trailing 'B' tells you about the gate sensitivity.


    Like you, I found out the hardway, years ago, about the different varieties of TRIACs, ironically also fixing NJD controllers (NJD = New Junction Discotheques, - those controllers where made in Sandiacre, Nottingham... about 5 miles from where I type this)




     


    Hello Adrian, yes definitely marked BTA08-600B. The centre pin connects to the heat sink tab. Perhaps they are wrongly marked or a sub-standard faulty batch? I have used N.J.D. stuff for years, although its design is a bit antiquated nowadays. But I like retro!


    Z.


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