Racal Dana 1998 blown fuse in BNC connector - Page 1
Forum section: electronics / testgear

author: PA3BBV
author_rank: Contributor
timestamp: April 17, 2024, 10:20:50 pm
content: 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 1/8AIs seems to be a keramic fuse with transparant isolation. The diameter is 2,08 mm and the length about 7 mmIs somebody having a partnumber or an adres where I can order a fuse? see attachmentThank you all!Regards, Leo

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: April 17, 2024, 11:35:07 pm
content: 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

author: BrokenYugo
author_rank: Super Contributor
timestamp: April 17, 2024, 11:54:24 pm
content: Any sign of who made the fuse holder?

author: GLouie
author_rank: Regular Contributor
timestamp: April 18, 2024, 12:44:00 am
content: 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

author: AVGresponding
author_rank: Super Contributor
timestamp: April 18, 2024, 05:26:25 am
content: Mouser:https://www.mouser.co.uk/ProductDetail/Littelfuse/0277.125NRT1?qs=Vv6sT79n3zTBYH3P4On6rw%3D%3D

author: GLouie
author_rank: Regular Contributor
timestamp: April 18, 2024, 06:05:53 am
content: 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=N4IgTCBcDaIAxgKwGYB0BGJBZEBdAvkAbut 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

author: PA3BBV
author_rank: Contributor
timestamp: April 18, 2024, 02:46:57 pm
content: 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.

author: hfleming
author_rank: Regular Contributor
timestamp: April 18, 2024, 03:07:31 pm
content: Yes, those fuses are called ‘pico-fuses’. They are still widely available, used to protect RF stuff on their inputs.

author: GLouie
author_rank: Regular Contributor
timestamp: April 18, 2024, 09:27:36 pm
content: The Schurter version claims 2.36mm dia.

author: coppercone2
author_rank: Super Contributor
timestamp: April 18, 2024, 10:50:48 pm
content: 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)

author: TERRA Operative
author_rank: Super Contributor
timestamp: April 19, 2024, 10:41:30 am
content: 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.

author: PA3BBV
author_rank: Contributor
timestamp: April 19, 2024, 09:03:57 pm
content: 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!

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: May 02, 2024, 05:40:18 pm
content: Don't order the military version, it's 10x more expensive.Digikey PN F7123CT-ND will do.