On 28 Jun 2004 13:34:48 GMT, (Hankal) wrote:

. Probably the most common is the 4509, which is a 14 volt, 100 watt bulb

I have one and it trips my 20 amp CB.
I know I do not have a short, but maybe my 20 amp CB is weak.
Any comments?

"Tungsten" loads for industrial relays are lower than one would expect
for a reason; the inrush current is very high, with the resistance
dropping dramatically as the filament heats. Likely the 20A breaker
is a "fast trip" unit, and the 40 or 50 amp inrush is getting you.

Normal options ... shorten the time (larger wire) or use a slow-trip
breaker ... neither options in an airplane. All you have left ...
check all connections for great, not just good, connections. It is
possible that another breaker might be slightly slower trip.

George