Surge suppressor circuit board 1170-2


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Thread: Surge suppressor circuit board 1170-2

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    Default Surge suppressor circuit board 1170-2

    Surge suppressor circuit board 1170-2 contains three varistors.
    Which of them is correct for 240-250 volts power supply line:
    NTE524V15 or NTE524V25 ?
    Can anyone answer?

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    Member john-100's Avatar
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    Default Re: Surge suppressor circuit board 1170-2

    it could be a mixture of both varistors

    if you have just the L1 , L2 and Neutral connections from a transformer like this

    Surge suppressor circuit board 1170-2-230ph-high_leg_delta_transformer-jpg



    you can use a NTE524V15 if its connected between L1 and Neutral or L2 and Neutral

    Surge suppressor circuit board 1170-2-nte524v15-jpg


    you will need to use a NTE524V25 if its connected between L1 and L2

    Surge suppressor circuit board 1170-2-nte524v25-nte-electronics-tvs-varistor-mov-250-a


    while you could trace the connections on the board but
    a simple solution without the maintenance manual will be to measure the voltage across the varistor terminals on the board

    if the voltage its about 120V use a NTE524V15

    if the voltage its about 240V use a NTE524V25

    John


    PS
    found this photo on line

    Surge suppressor circuit board 1170-2-1170-2-jpg

    its not clear what the 3 screw terminals are but I expect its going to be like this

    Surge suppressor circuit board 1170-2-board-1170-2-v2-jpg

    PPS
    if you connected the board to a 3 phase supply with 245 to 250V between phases
    like this

    Surge suppressor circuit board 1170-2-board-1170-2-three-phase-connection-jpg

    you will need to use six NTE524V25

    Last edited by john-100; 10-29-2018 at 12:13 PM. Reason: add PPS


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    Default Re: Surge suppressor circuit board 1170-2

    Thanks John-100



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    Member ASIGuy's Avatar
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    Default Re: Surge suppressor circuit board 1170-2

    Voytec1,

    If you don't want to fuss with finding the MOV's, soldering and such, we have the boards in stock ready to plug in.

    PCB-0146 (PCB: 510V SURGE SUPPRESSOR; 1170-2\N): $85
    PCB-0145 (PCB: 250V SURGE SUPPRESSOR; 1170-2): $90
    Both in stock

    FadalCNC Tech Support.



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