Toggle switch question

I have seen the ON-OFF-ON designation used on a DPDT switch to indicate a center off position. Perhaps ON-NONE-ON is Allied's way of indicating a center off position.

On to either side of center, all off in center position.

Try "allelectronics.com" or "

We use them at the club to have local-off-main power to various areas (mostly the passenger yard).

Hmm, I'd read it the other way, that NONE means it *doesn't* have a center off position. Allied has a toll-free number, don't they? Unless someone posts a definitive answer, I'd call and ask, or shoot them an e-mail.

Steve

The On - None - On designation means that there is not a center position for the switch. It will be a TWO position switch.

The other type of switches that most people have seen is the On - Off - On type. There are others that are On - On - Off or even On - On - On in different combinations. Now if you have more poles in the swithch there are a lot of other combinations available.

But the On - None - On switches are the old standby two position switches that can be wired up to route power in two different directions or to route two different signals to one line.

ka0ies

Frank, all you need is a regular DPDT toggle switch. I'll guess, after looking through Allied's catalog listings, that ON-NONE-ON means NO center position. I checked ALL Electronics and they show their DPDT an an ON-ON switch - see:

I don't think that's right. I side with those who have guessed that On-None-On and On-Off-On are the same thing. On-On is the customary designation for a two position switch.

-- Bill McC.

One advantage to think about for a center off switch when driving tortoise motors: service position.

I've found having the off so when I need to work on a turnout (align linkages, clean points, gauge track) being able to lock the turnout in the middle (time it carefully for when to go 'off') has been great. At our club we've only had someone leave a turnout 'off' by accident once in the last 8 months as I can recall. Also if you wire lights (either control panel or semaphore lights on the trackside) into the same circuit they would go dark too and give clear warning that something is not right.

Thanks for that thought, Ken. I had not considered that as a possibility.

Then why d'ypu suppose they list switches as ON-NONE-ON (683-0063) and ON-OFF-ON (683-0066)

The "NONE" indicates no center position...

In the "Off" position the input and output wires are isolated from each other but in the "None" position the wires fall off?

"NONE" indicates a goofy notation.

"Cheery Littlebottom" wrote in message news: snipped-for-privacy@4ax.com...

I haven't seen the catalog and the OP did not indicate that On-Off-On was the only alternative in the catalog. If in On-None-On does, indeed, mean the same as On-On, it is a very unusual and misleading (witness this thread!), way to list it.

-- Bill McC.

The "ON-NONE-ON" indicates there is no center position for the switch to normally stop. Is this goofy as one post suggested? When you look at all the possible combinations of toggle switch operations that are available, it is not as goofy as it seems.

I have 30+ year old catalogs (Eaton company) that use this notation for commercial and mil spec parts. In addition to the two position 'ON-ON' and 'ON-OFF-ON' the calog described monentary operations (MON-OFF-MOM), center on operations, a 'staggered' (which is won't try to explain without graphics) and various combinations of these.

The 3 you specified are reasonably clear and obvious. I've also seen (ON)-ON-(ON) which I take to mean MOM-ON-MOM.

ON-NONE-ON ... how many positions are there, 2 or 3? The notation suggests 3. Why mention 3 conditions if there are only two states to describe?

It's a goofy notation.

Paul

Three way, centre off?

Jim.

Too bad you cut the previous posters comment:

So again I ask: how many positions are there? You and RailDavid can hash it out and let us all know the answer. *8-}

Paul

The previous poster used the word "indicates", which is not a definitive statement.

However, an alternative may be an other way of describing a break-before-make two pole switch.

And I've now read the rest of the thread and I'm waiting on an answer as well :-)

Jim.

The "ON-NONE-ON" indicates there is no center position for the switch to normally stop. Thus, this is a two position switch.