Sam Goldwasser wrote in
:

"Rich.Andrews" writes:

The Real Andy
.pearson@wayit_dot_com_dot_au_remove_the_obvious_ to_reply
wrote in :

On Wed, 11 Aug 2004 02:07:07 -0000, "Rich.Andrews"

wrote:

I am looking for a contactor or relay that has the following
characteristics:

1) silent or nearly silent in operation.
2) Be able to handle 20 amps of current.
3) be available in a variety of coil voltages including 120VAC.
4) Cost no more than $30.00 each
5) Rated for continuous duty use.
6) Operable in any position.

Does anyone have any suggestions?

r

Lets see, you want a contactor that does everything and cost nothing,
yet you fail to supply any details of the load you are switching?



The load is a 120 VAC transformer. Having a variety of coil voltages
allows for flexibility in the early design stages. I figured a relay
would be cheaper and that $30.00 was a good figure. Maybe I should
allow
two to three times my original dollar figure for the relay? Rarely
would
it be switched while under full load.

Check out solid state relays.

--- sam


Sam,

Solid state relays seem like a good idea but isn't there issues with them?
At one point in time I worked at a hospital that used SS relays to control
the TV sets in the patient rooms. When they got a new batch of TV sets
in, many of the sets failed in less than a month. The SS relays were
blamed and the relays were changed out. We never could figure out what
the issue was with the old ones as they worked fine with the old sets.
The old sets were zenith Chromacolor II and the new ones were Chromacolor
III. The old sets had a transformer and the new ones did not.

r


--
Nothing beats the bandwidth of a station wagon filled with DLT tapes.