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    Anybody Know What This Is?

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    I know what this is now, but it wasn't until a week after I found it, when I correlated the schematics to this part. Does anybody know what the thing labeled "D" is? If so, how did you know? There's no part number or manufacturing information on the component. FYI, it's just a component on a back panel, next to some fuses, relays, etc. Here's a zoomed out view:

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    #2
    Relay.

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      #3
      Originally posted by 480sparky View Post
      Relay.
      Like a relay base? That was my guess too. I was wrong though. I want to wait and see if someone can identify it before the big reveal.

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        #4
        I t looks like some encapsulated diodes.
        Just because you can, doesn't mean you should.

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          #5
          Originally posted by That Man View Post

          Like a relay base? That was my guess too. I was wrong though. I want to wait and see if someone can identify it before the big reveal.
          This crowd doesn't run like that. They will want to know, like......... NOW!

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            #6
            Originally posted by jim dungar View Post
            I t looks like some encapsulated diodes.

            A full wave rectifier. . .the "D" label denotes the DC output. It is bolted to the back plate that will serve as heat sink.

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              #7
              Originally posted by jim dungar View Post
              I t looks like some encapsulated diodes.
              I agree-- bridge rectifier-- AC in, DC out.

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                #8
                That's right. That tiny little thing is a rectifier. I've never seen one in the field before, apparently. I guess I thought they would be bigger, and have some sort of label. This forum's great.

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                  #9
                  Originally posted by myspark View Post


                  A full wave rectifier. . .the "D" label denotes the DC output. It is bolted to the back plate that will serve as heat sink.
                  I dunno... the ones I've seen have AC on one pair of diagonals, DC on the other...

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                    #10
                    Looks like a full wave rectifier to me. The D is a ?, but I would have had my handy dandy T+ on there pretty quick to verify.

                    Tom
                    TBLO

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                      #11
                      I'm with the bridge rectifier crowd. They come smaller and larger. I'm used to symbols for AC in and DC out, not a D on the heat sink extension.

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                        #12
                        Yep, diode bridge rectifier.

                        The one terminal that is at 90 deg. to all the others is always the + DC terminal, the - DC terminal is always kitty-corner to it, then the other two corners are the AC terminals.That way you can't mess up and put AC in the DC side or vice-versa (if you know that...).
                        __________________________________________________ ____________________________
                        Many people are shocked when they discover I am not a good electrician...

                        I'm in California, ergo I am still stuck on the 2014 NEC... We'll get around to the 2017 code in around 2021.

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                          #13
                          Cast my vote.
                          Rectifier.
                          That isn’t what the “D” is for though. That is the labeling for the schematics.
                          we have lots of them in 115kV breakers.
                          AC in, DC out, as stated.
                          Had one CCVT at a station that was a little low on output. Kept blowing out rectifiers.
                          Ended up putting a small 500VA series XF in to boost the voltage up to about 130V..

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                            #14
                            I've been into electronics since I was a kid (physically, I mean). I recognized the full-wave bridge rectifier immediately, probably with a 25-amp rating.
                            Master Electrician
                            Electrical Contractor
                            Richmond, VA

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                              #15
                              Some type of rectifier was my first thought too. I guess you just have to have seen them before. Not sure if anyone could know if it is half wave or full wave just by looking at it, though.

                              Another clue includes 4 wires/terminals (Although I'm not sure who made them all black - bad planning on the part of whoever assembled this panel, IMO.)

                              Also, its usually obvious there is both AC and DC in the panel . For example, AC input from a 120V panel, and relays with DC coils). I would normally expect to also see a step down transformer, and either a power supply or at least some filter caps.

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