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Angier,
Relays usually incorporate two coils - a "pull" and a "hold" coil - and a
system of springs (to return the solenoid when power is released) to best
function for a particular task. A master contactor pulls quite slowly/hard but
holds quite easily. This is because the master solenoid remains closed
throughout the duration of the trip (i.e. "continuous duty"). A starter
contactor, on the other hand, "pulls" quite easily (to close the "gap" quickly
to minimize arching from the larger current loads created by the starter motor)
and is only designed to "hold" for only short periods of time. (i.e.
"intermittent duty").
If you look long enough you will find what you need here.
Grayhawk
In a message dated 3/25/2013 6:44:33 P.M. Central Daylight Time,
N4ZQ@VERIZON.NET writes:
About 3
mos ago, the high side relay failed while 4ZQ was up on jacks. I figured that
old age (original kit) plus X number of cycles during construction took that
relay to the end of its useful life. So trying to kill two birds with one
stone, I replaced both hi/lo relays with new (chinese) from the local auto
parts store.
The cause of yesterday's gear failure turned out to be the
NEW low side relay, and it had just 14 cycles....
So, on the assumption
that relay quality differs, who makes a HIGH quality relay with the same
footprint as those that
came with the kit? Any reason why they should not
be continuous duty type?
Angier Ames
N4ZQ
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