DEC 874D power controller - test-drb@ccmp.vtda.org

12 Sep 2007

Charles said:

...
  Does anyone have the schematic for an 874-D power
controller?
 Or better yet, a good used circuit breaker? 
Well I don't have a breaker, but at least you can check the
print set for the details.  I also recently needed to examine
the schematic, and found it at:

http://www.vt100.net/manx/details/1,3467

...
  At least one of the three (ganged) breakers is
internally flaky
 and will turn off if the handle is pushed upward all the way to
 "ON" (they work if the handle row is carefully lifted just far
 enough but obviously that is not reliable). 
You're right, not very reliable.

...
  It looks like the (original-type) Heinemann breakers
are available
 from Newark, and similar ones from Mouser that will probably fit,
 but they are *very* expensive new... 
Well, I haven't checked the prices, but you may find reasonable
success by getting another 874D unit.  I just saw one trade hands
on eBay for around $20.

- Jared