Racal Dana 1998 blown fuse in BNC connector

[PA3BBV]

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

[Jeff eelcr]

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

[BrokenYugo]

Any sign of who made the fuse holder?

[GLouie]

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

[AVGresponding]

Mouser:  https://www.mouser.co.uk/ProductDetail/Littelfuse/0277.125NRT1?qs=Vv6sT79n3zTBYH3P4On6rw%3D%3D

[GLouie]

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

[PA3BBV]

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.

[hfleming]

Yes, those fuses are called ‘pico-fuses’. They are still widely available, used to protect RF stuff on their inputs.

[GLouie]

The Schurter version claims 2.36mm dia.

[coppercone2]

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)

[TERRA Operative]

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.