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  • Surge Suppression

    Could anybody recommend a surge suppressor for WPD40-3L-230 Definite Purpose Contactor.
    Thanks in advance.


  • #2
    Since the whole point of a definite purpose contactor is to be cheap (and one tolerates limited life to get cheap), I'd suspect that a simple MOV (if anything) would most often be used.
    I quick search of Automation directs site didn't find one, but most major electronic component suppliers should have them, one would want one rated a fair bit higher than the normal control voltage, but not crazy high, I don't really know, maybe 400V? 300?
    At 230VAC I imagine you are not driving these with a solid state output, if the switch or relay that is driving them is beefy enough you'd probably get away with nothing, other people have.

    ADC does have surge suppressors for their more expensive contractors, e.g. https://www.automationdirect.com/adc..._80_amp/sz-z35 which costs nearly as much as you contactor, there is also ones like https://www.automationdirect.com/adc...ac3)/vrc0-3e50 that are much less expensive but mounting seems to be specific to a particular series of contractors.

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    • #3
      Originally posted by Tinker View Post
      At 230VAC I imagine you are not driving these with a solid state output, if the switch or relay that is driving them is beefy enough you'd probably get away with nothing, other people have.
      I'm using interposing relays.
      This system is controlled by a BRX and I'm having problems with it's on-board 4-20ma analog inputs acting up.
      I've had this problem before and adding surge suppression fixed the issue.
      I should've known better and should've installed some in the first place but.......
      Weird that it's having no any effect on the 0-10v analog input card.
      Thanks for your help.

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      • #4
        I try to use Quencharc R/C networks: https://www.digikey.com/product-deta...581-ND/2503688

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        • #5
          Originally posted by genebond View Post
          I try to use Quencharc R/C networks: https://www.digikey.com/product-deta...581-ND/2503688
          Thanks for the link, I'll check it out.

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          • #6
            Originally posted by genebond View Post
            I try to use Quencharc R/C networks: https://www.digikey.com/product-deta...581-ND/2503688
            Do you find the RC networks to work better than MOVs?

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            • #7
              Back in the day (in my previous life), I did some serious testing of MOV's vs. R/C's for noise spikes effecting SCR's mis-firing... I found that the R/C's were almost 10x faster at absorbing the quick spikes which caused issues. I've gone that route ever since...

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              • #8
                MOVs are a very low budget option (like definite purpose contactors) RC networks are generally considered much better, but note that the Quencharc linked to above costs about half as much as your contactor while a MOV might well be significantly less than a dollar in quantity.
                I mentioned a MOV because original poster specifically said definite purpose contactor.

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                • #9
                  OK thanks for the feedback guys and have a great Thanksgiving!

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                  • #10
                    Originally posted by genebond View Post
                    I try to use Quencharc R/C networks: https://www.digikey.com/product-deta...581-ND/2503688
                    Holy crap, $8???? Why not buy these for $0.30-0.40?

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                    • #11
                      Good question... I haven't bought them in years. That Okaya part looks to be about the same rating, and should work just as well, so why not?

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                      • #12
                        Originally posted by genebond View Post
                        Good question... I haven't bought them in years. That Okaya part looks to be about the same rating, and should work just as well, so why not?
                        I've used hundreds of them, and if there's some disaster looming, I haven't seen any signs of it.

                        CDE seems to be pretty proud of those Quencharc's don't they? Dang.

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                        • #13
                          Yea, I thought I remembered $1 or thereabouts/each...

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