Racal Dana 1998 blown fuse in BNC connector

• Racal Dana 1998 blown fuse in BNC connector
  Posted by PA3BBV on 17 Apr, 2024 22:20
• Hi All,
  
  I own a Racal Dana 1998. The fus in the BNC connector from input B is blown. Cannot find a replacement on internet, The subscription on the fuse is: F 1/8A
  
  Is seems to be a keramic fuse with transparant isolation. The diameter is 2,08 mm and the length  about 7 mm
  
  Is somebody having a partnumber or an adres where I can order a fuse? see attachment
  
  Thank you all!
  
  Regards, Leo
  
  
  

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• #1 Reply
  Posted by Jeff eelcr on 17 Apr, 2024 23:35
• I do not know your area but Little Fuse is the manufacturer.
  Not at work so looking up part number is out for now also.
  Jeff
• #2 Reply
  Posted by BrokenYugo on 17 Apr, 2024 23:54
• Any sign of who made the fuse holder?
• #3 Reply
  Posted by GLouie on 18 Apr, 2024 00:44
• I think that is an old version of the Littelfuse Picofuse. New ones look like axial resistors.
  They do come in fast and slow versions, and I can't help you on who stocks them.
  
  https://www.littelfuse.com/industries/consumer-electronics/fuses/pico-fuses.aspx
• #4 Reply
  Posted by AVGresponding on 18 Apr, 2024 05:26
• Mouser:  https://www.mouser.co.uk/ProductDetail/Littelfuse/0277.125NRT1?qs=Vv6sT79n3zTBYH3P4On6rw%3D%3D
• #5 Reply
  Posted by GLouie on 18 Apr, 2024 06:05
• Unfortunately, the above not stocked by Mouser in UK or USA, and minimum order of 5000pc. But Digikey Netherlands claims to have these in stock:
  
  https://www.digikey.nl/nl/products/detail/littelfuse-inc/0253-125M/553089?s=N4IgTCBcDaIAxgKwGYB0BGJBZEBdAvkA
  
  but I don't know if the 125v rating is correct, Schurter also makes a substitute,
  
  https://www.digikey.nl/nl/products/detail/schurter-inc/7010-6310-13/1731116
  
• #6 Reply
  Posted by PA3BBV on 18 Apr, 2024 14:46
• Thank You all for you sugggestions.
  
  The fuse is in an BNC connector. the space in the connector is 2.4 mm. I ordered an Littlefuse from 2,6 mm en gonna try to drill the space up 0,3 mm. I have ordered fuses and keep you informed.
• #7 Reply
  Posted by hfleming on 18 Apr, 2024 15:07
• Yes, those fuses are called ‘pico-fuses’. They are still widely available, used to protect RF stuff on their inputs.
• #8 Reply
  Posted by GLouie on 18 Apr, 2024 21:27
• The Schurter version claims 2.36mm dia.
• #9 Reply
  Posted by coppercone2 on 18 Apr, 2024 22:50
• its just clear heat shrink to prevent t he glass from dispersing if the fuse breaks nasty I think.
  
  you can get teflon heat shrink (most rugged) but it might be hard to shrink on a fuse with out damaging it (high temp required)
  
  Picofuses come from everything, I like the versions that look like 1/4 watt resistors (green)
• #10 Reply
  Posted by TERRA Operative on 19 Apr, 2024 10:41
• HP 5335A counter uses a similar fuse-in-BNC setup on the 3GHz input option. I used the pico-fuses and it was a peefect fit.
• #11 Reply
  Posted by PA3BBV on 19 Apr, 2024 21:03
• Hi All,
  Today, I have received tge pico-fuses, they fit in the connector and all is working fine again. Thank you all for the support!
   
• #12 Reply
  Posted by BreakingOhmsLaw on 02 May, 2024 17:40
• Don't order the military version, it's 10x more expensive.
  
  Digikey PN F7123CT-ND will do.