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    Help identify varistor

    Need help identifying component.
    It has markings 07 431 VDE
    Attached Files

    #2
    Re: Help identify varistor

    probably a 430v VDR - is it 7mm diameter?

    Comment


      #3
      Re: Help identify varistor

      around 7mm yes
      looking for replacement.
      I have SCK 053 as spare or it is not VDR.

      Comment


        #4
        Re: Help identify varistor

        Originally posted by otoluk View Post
        around 7mm yes
        looking for replacement.
        I have SCK 053 as spare or it is not VDR.
        SCK-053 is a thermistor (these are completely different components).
        http://www.datasheetcafe.com/sck-053...et-thermistor/

        Comment


          #5
          Re: Help identify varistor

          So this is not inrush current limiter?
          How to verify if it is not bad?

          Comment


            #6
            Re: Help identify varistor

            VDR is a varistor (has no resistance) placed in parallel with the power supply (AC or DC)
            SCK is a thermistor (has a resistance) placed in the gap (as a current limiter) of the power supply.
            Last edited by lotas; 10-11-2022, 11:17 AM.

            Comment


              #7
              Re: Help identify varistor

              Double checked yes it is parallel to AC.

              Comment


                #8
                Re: Help identify varistor

                Originally posted by otoluk View Post
                Double checked yes it is parallel to AC.
                So what's the problem, it (VDR) usually explodes if the voltage has passed more than its nominal value.

                Comment


                  #9
                  Re: Help identify varistor

                  Seems it is not the problem. I got voltage drop on input so the converter shuts off after some 5 minutes looking for cause.

                  Comment


                    #10
                    Re: Help identify varistor

                    This is fuse?
                    C250 080 030W

                    measured resistance 19k Ohm
                    Attached Files
                    Last edited by otoluk; 10-11-2022, 12:35 PM.

                    Comment


                      #11
                      Re: Help identify varistor

                      A fuse cannot have a resistance of 19 kOhm. What is the position number on the board (designation)? And on the other side there is no inscription?

                      Comment


                        #12
                        Re: Help identify varistor

                        This seems to be resettable fuse - https://en.wikipedia.org/wiki/Resettable_fuse

                        Position number on board F6 and other side is blank.

                        Comment


                          #13
                          Re: Help identify varistor

                          Well, if F, then yes it's a fuse, but it's strange that he's so pot-bellied. At 250v 800mA?
                          Last edited by lotas; 10-11-2022, 01:30 PM.

                          Comment


                            #14
                            Re: Help identify varistor

                            It is from Galmet wood pellet boiler controller.
                            Apparently it was left switched on all summer in tripped state. When it trips the LED backlight is not visible so looks switched off. Wood pellet boilers this year are very popular in our region.

                            Comment


                              #15
                              Re: Help identify varistor

                              Well, then you need to replace it, put the usual one on 1A, to check the block

                              Comment


                                #16
                                Re: Help identify varistor

                                Isn't it 0.08A?

                                Comment


                                  #17
                                  Re: Help identify varistor

                                  I can’t say for sure (I need a datasheet) somewhere they write 080 - 80mA, but somewhere it’s 800mA.
                                  But 0.08A is some very small current for this block.
                                  Last edited by lotas; 10-11-2022, 02:00 PM.

                                  Comment


                                    #18
                                    Re: Help identify varistor

                                    Found manufacturer with similar symbol - https://www.made-in-china.com/showro...able-Fuse.html

                                    Comment


                                      #19
                                      Re: Help identify varistor

                                      It seems to be 250V 80mA hold, 160mA trip PTC fuse, 6.5mm dia. Sea & Land Electronic corp. C250-080
                                      There is something else shorted for this PTC fuse to heat up and die. I would look for a problem in the power supply section.

                                      Comment


                                        #20
                                        Re: Help identify varistor

                                        Thanks.
                                        The previous converter failed so maybe took this on the way.

                                        Comment

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