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Help needed identifying onboard fuse

Discussion in 'Datasheets, Manuals and Component Identification' started by Jshiloh, Nov 15, 2018.

  1. Jshiloh

    Jshiloh

    3
    1
    Nov 15, 2018
    Hi, I am looking for some help Identifying a fuse that blew on a circuit board that i am trying to repair. I have attached 2 images showing the fuse. on one side there is a square with either a 5 or an S in it (I am assuming that is the logo but unsure who the manufacturer is), and on the other side it says T25. I have been searching online for about an hour and cannot seem to come up with anything to tell me what this fuse amp rating is. Any help would be greatly appreciated. Also this is on a Siemens Microtech 3 controller. Thanks again for any help

    IMG_0274.jpg

    IMG_0275.jpg




    [Mod edited to resize huge images]
     
    Last edited by a moderator: Nov 15, 2018
  2. Tha fios agaibh

    Tha fios agaibh

    1,901
    599
    Aug 11, 2014
    Often the amp and voltage ratings are marked on the metal ends. You may have to clean off the solder to find markings.

    Any clues on the board itself that may suggest what it may be rated?
     
  3. dave9

    dave9

    765
    170
    Mar 5, 2017
    Determine where it is in the circuit then see if the following document is helpful. It seems the Siemens now goes under the name Daikin? It has diagrams for multiple models with fuse current and you'd pick a voltage rating above that shown for that part of the circuit.

    https://www.daikinapplied.com/o365/...19-3_LR_MT-III_Controller_for_AHU_Manual.pdf/

    Keep in mind that a blown fuse is often a sign it did what it was supposed to do, blew because some other fault is causing excessive current. If you only replace the fuse, it may just blow again, or risk further damage or even fire (but probably will just blow again).
     
    Last edited: Nov 15, 2018
  4. Jshiloh

    Jshiloh

    3
    1
    Nov 15, 2018
    thanks all. after 2 hours of looking, i did find some literature on the Microtech telling me it has a max pass through current of 4amps at 24VAC (dimensions 2.3mm x 8.mm) . I also found that the fuse brand is Schurter.

    Dave9
    the fuse was originally blown due to a short in another component in the unit i was working on. Also Daikin calls it the MicroTech III, but it is manufactured by Siemens. the Siemens part number is POL687.70/MCQ

    hope this helps someone in the future having this same issue. again thank you for the responses.
     
  5. Jshiloh

    Jshiloh

    3
    1
    Nov 15, 2018
    davenn likes this.
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