MadModder

The Shop => Electronics & IC Programing => Topic started by: Pete49 on July 27, 2013, 01:02:49 AM

Title: fuse selection
Post by: Pete49 on July 27, 2013, 01:02:49 AM

Dear collective Just after some advice on fuse selection. I have just finished repairing a Waeco power supply, a Mobitronic MPS 50 which switches 240AC to 24V DC to run a portable  fridge/freezer. The fuse in question is a 15A 250V glass fuse and I need to know if it is a fast or slow blow fuse. Its in line with the 240V input prior to the rest of the circuit. Any help would go a long way to getting this job out of my shed and back to earning its keep
Pete

Title: Re: fuse selection
Post by: rdhem2 on July 27, 2013, 01:15:25 AM

There should be some additional information in the feral on the fuse.  Like AGC, or MDL.  This is what identifies the type of fuse as far as trip characteristics.  Then voltage and amperage.  As an example  AGC 15    250vac   

HTH             

Title: Re: fuse selection
Post by: tekfab on July 27, 2013, 02:45:56 AM

I find that a 0.8mm mig tips to be excellent slow burn fuse's , never had one blow yet !  ;-)

Mike

Title: Re: fuse selection
Post by: John Rudd on July 27, 2013, 12:48:23 PM

IMHO it needs to be a slow blo due to the inductive nature of the transformer....

Usual disclaimer...

 ...and I stand to be corrected if I'm wrong :zap:

Title: Re: fuse selection
Post by: David Jupp on July 27, 2013, 01:23:08 PM

I'd be very surprised if it is really 15A !  could it be 1.5A with a less than obvious decimal point?

Title: Re: fuse selection
Post by: John Rudd on July 27, 2013, 04:43:16 PM

I concur with Davld,
15amp rating on he primary doesn't seem right.......
If the secondary is rated for 12 amps or so that equates to around 1.5 amps on the primary......

Title: Re: fuse selection
Post by: Pete49 on July 27, 2013, 11:33:03 PM

there ya go I knew I could rely on you all. After the comments from David & John I went and had another look with a magnifier and yep its a 1.5 so now all fixed :clap: I had those available so now the project is moving forward again. Thank you all for the help  :mmr:
Pete

Title: Re: fuse selection
Post by: sparky961 on July 29, 2013, 12:24:52 PM

Quote from: tekfab on July 27, 2013, 02:45:56 AM

I find that a 0.8mm mig tips to be excellent slow burn fuse's , never had one blow yet !  ;-)

Mike

Probably to be taken tongue in cheek, but I'm always surprised by the number of people who ignore the importance of fuses and breakers.  If it blows, there's a reason!

Title: Re: fuse selection
Post by: awemawson on July 29, 2013, 01:15:53 PM

There is a fairly well documented report of some plonker on the web who replaced a fuse under his dash with a .22 bullet. Apparently was some time later it went through his foot  :bugeye:

Title: Re: fuse selection
Post by: mklotz on July 29, 2013, 05:09:30 PM

Quote from: awemawson on July 29, 2013, 01:15:53 PM

There is a fairly well documented report of some plonker on the web who replaced a fuse under his dash with a .22 bullet. Apparently was some time later it went through his foot  :bugeye:

BS

http://www.snopes.com/autos/techno/fuse.asp