[Milsurplus] Fuses to protect transformers

[Mark K3MSB]

Is using a transorb an alternative?

73 Mark K3MSB

Sent from my Android phone
On Mar 13, 2014 12:27 AM, <hwhall at compuserve.com> wrote:

> For this 40s vintage Link Trainer electronics I'm working on, I'm thinking
> that it'd be a good idea to fuse not only the primary but the secondary HV
> winding, since these transformers are not too easy to find anymore. I'm
> thinking of pigtail fuses inserted in the wiring under the chassis, to
> maintain appearances. But I'm not sure about what fuse selection would be
> adequate protection.
>
> Would a 1A fast blow fuse be OK for the secondary that probably delivers
> around 100ma DC? Or to put it another way, how much over the normal current
> output should I select a fast blow fuse? The filters are dual section choke
> input with 15 & 25 mfd caps. I haven't reached the point of firing up the
> whole thing, so I have to guess for now at the current.
>
> The common fuses I have available are marked 250V and the HV is 450V. Can
> they be relied on to open and not arc?
>
> Any advice? Thanks!!
>
> Wayne
> WB4OGM
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