professorpaul wrote:

How about a light coat of silicon grease (any auto parts store). That
will slow down the corrosion issue substantially. Light coat, wipe most
of it off.


The first thing I tried, when the first fuse "fried" that way, was to
brush a little Thomas & Betts "Koppershield" on the switch contact
surfaces and on the cartridge fuse clips themselves.

That may have helped, but it didn't stop it from happening over and over
again every couple of years.

I've mentioned the problem to several experienced electricians and they
all said they've seen the same problems occur in GE fused disconnect
switches.

I suspect that the first time the overheating happens the heat anneals
the copper swich blades and or the springs which apply pressure so they
are no longer stiff enough to maintain a low resistance contact.

Whatever, nuttin's perfect is it?

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.