[Collins] SELL: Collins 30S1 Amperite 115NO180 Time Delay Relay

[Dr. Gerald N. Johnson]

On Tue, 2009-09-08 at 23:34 -1000, Raymond Cote wrote:
> Since Ron brought up 115 volt relays, I checked my stock and I have 115NO30T 
> and 115 NO2.  Anyone know what these numbers mean?  My guess would be 115 
> Volts, NO [normally open] and the 30 would probably mean 30 seconds.  What 
> about the the ending on the first one?   The 115 NO2 is not as apparent. 
> Anyone?
> 
> 
I took a hike to my catalog archive in the attic.

Yup the first number group is the heater voltage. The letter groups
could be NO or NC. The second number group is time delay in seconds give
or take a second. The T suffix is miniature vs the standard octal based
delay.

So 115NO30T is 30 seconds miniature tube package. 115NO2 is 115 volts 2
seconds octal based package. 2 seconds would be appropriate for a step
start where the filter capacitors get to charge through a resistance in
series with the line, then the transformer primary gets full voltage.
That delay in the 30S-1 comes from using a relay on DC with an RC delay.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer