SP Multiple Throw relay?

[dafydd61]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

Thanks for any advice.

cheers
dafydd

 

[John Popelish]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

The old pulse dial telephone did their job by pulsing
stepper relays back a the telephone office. You might do a
search for [stepper relay]. But I think 10 (or maybe 11, a
start position and 10 other positions for the 10 digits)
throw are a lot more common than 12. But that is an opinion
based on ignorance.

 

[Tim Wescott]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

Thanks for any advice.

cheers
dafydd

What behavior are you looking for? The stepper relay that John is
talking about moves to another contact each time an input is pulsed, and
must have a way of resetting the thing back to zero (presumably with a
second input). Is that what you want, or do you want something like a 4-
wire system that selects one of 12 contacts, only for as long as power is
applied?

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

 

[JeffM]

I'm looking for (I think) a single pole 12-throw relay that can handle 120 VAC.

HOW MUCH **CURRENT**?

 

[sycochkn]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

Thanks for any advice.

cheers
dafydd

you mean like a stepping relay?

Bob

 

[BobW]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

The old pulse dial telephone did their job by pulsing stepper relays back
a the telephone office. You might do a search for [stepper relay]. But I
think 10 (or maybe 11, a start position and 10 other positions for the 10
digits) throw are a lot more common than 12. But that is an opinion based
on ignorance.

Here's on that's available on ebay. The search term was "strowger".

http://cgi.ebay.com/Western-Electri...ryZ38038QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Bob

 

[Ben Jackson]

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

12 individual relays (easy) plus a microcontroller or other logic to
drive them. The controller determines make/break before make, order, etc.

 

[John Fields]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

---
Ledex and Oak used to make motorized switches using rotary
solenoids, and they can be had surplus nowadays.

Google "LEDEX switch" for quite a few hits.

If you don't want to go that route it's easy enough to build one
using logic and discrete relays.

What's your application?

 

[Tom2000]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

Thanks for any advice.

cheers
dafydd

Hunt around for 'rotary stepping switch' or 'motorized switch'

You can find a few examples here:

http://www.surplusales.com/Switches/SWLedex-1.html

I suppose, if you can't find exactly the switch you need, you could
build your own motorized switch, using a dual-pole, 12 position
switch. You'd use one pole for your 120 VAC switching, and the other
pole for indexing the motor drive.

Good luck!

Tom

 

[Jamie]

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?

The old pulse dial telephone did their job by pulsing stepper relays
back a the telephone office. You might do a search for [stepper
relay]. But I think 10 (or maybe 11, a start position and 10 other
positions for the 10 digits) throw are a lot more common than 12. But
that is an opinion based on ignorance.

I have seen and held in my hand stepper relays with 50 positions and 10
rows of contacts. But that was 25 years ago.

Ha, We still maintain an old HIPOT test cage at work that uses 2 8
Position stepper single pole relay. The two formed as a matrix
to select 1 out of the possible 255 leads in the cage. One Selects
the low ROW while the other selects The High COL scan to select the
proper vacuumed relay when connecting a lead wire.
The machine has a mechanical timer, lead down counter, paper printer
etc.. very old but still working.

 

[dafydd61]

John Popelish wrote:

dafydd61 wrote:
Hi folks
Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throwrelaythat can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?
The old pulse dial telephone did their job by pulsing stepper relays
back a the telephone office. You might do a search for [stepper
relay]. But I think 10 (or maybe 11, a start position and 10 other
positions for the 10 digits) throw are a lot more common than 12. But
that is an opinion based on ignorance.

I have seen and held in my hand stepper relays with 50 positions and 10
rows of contacts. But that was 25 years ago.

Ha, We still maintain an old HIPOT test cage at work that uses 2 8
Position stepper single polerelay. The two formed as a matrix
to select 1 out of the possible 255 leads in the cage. One Selects
the low ROW while the other selects The High COL scan to select the
proper vacuumedrelaywhen connecting a lead wire.
The machine has a mechanical timer, lead down counter, paper printer
etc.. very old but still working.

--http://webpages.charter.net/jamie_5"

Thanks everybody for your advice. Folks here are _really_ smart!

Turns out I was thinking about it wrong, and indeed all I needed to do
was learn to think of the problem in a matrix. I've got a lot to
learn.

Thanks again for the help!

cheers
dafydd

 

[Robert Baer]

dafydd61 wrote:

Hi folks

Sorry if this is an obvious question, but I'm looking for (I think) a
single pole 12-throw relay that can handle 120 VAC. Does such a thing
exist? If not, is there a way of building one?



The old pulse dial telephone did their job by pulsing stepper relays
back a the telephone office. You might do a search for [stepper
relay]. But I think 10 (or maybe 11, a start position and 10 other
positions for the 10 digits) throw are a lot more common than 12.
But that is an opinion based on ignorance.

I have seen and held in my hand stepper relays with 50 positions and
10 rows of contacts. But that was 25 years ago.

Ha, We still maintain an old HIPOT test cage at work that uses 2 8
Position stepper single pole relay. The two formed as a matrix
to select 1 out of the possible 255 leads in the cage. One Selects
the low ROW while the other selects The High COL scan to select the
proper vacuumed relay when connecting a lead wire.
The machine has a mechanical timer, lead down counter, paper printer
etc.. very old but still working.

....and the rather elegant row/column solution was the famous Cunningham
Crossbar.

 

[Ben Jackson]

-- but if you want it to remember it's state like a stepping relay, you
have to supply power to the microcontroller.

Use latching relays. During the 'step' pulse the uc wakes up, senses the
current position or reads it from eeprom, changes the relays as appropriate
and loses power. With a suitable cap and the biultin brownout detection
in most modern micros you can ensure that pulses are either ignored or
result in one complete step.