Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
On-Off-On vs. On-None-On .
1,781 views
Skip to first unread message
micky
May 14, 2014, 6:42:45 PM5/14/14
to
I'm looking at the Mouser Electronics catalog, at DT rocker switches,
and I'm wondering what the difference is between
On-Off-On and On-None-On .
The second is used much less, but, suprisingly, it's used in the same
section, from the same maker, as the first is used.
A guy on the web says ""On-None-On" indicates there are only two rest
positions, making one connection or the other. " but again, the same
maker will have many other DT swtiches marked On-Off, so that's a little
hard to believe. Or is that false too, and None means the middle
position of the switch is not connected to the neon light in the switch,
but Off just means the other loads aren't connected?
I'm also wondering if there is a difference between
On-Off-(On) and On-Off-Mom ?
Is the second a new category for Mother's day? That's today, but I'm
pretty sure this catalog was printed years ago, since i've had it for
years. And again, Mom is used much less, but when it is used, it's
the same maker and the same section where (On) is used.
If one maker uses both terms, it seems like, in both cases here, they
might have different meanings, but I can't think of any.
and I'm wondering what the difference is between
On-Off-On and On-None-On .
The second is used much less, but, suprisingly, it's used in the same
section, from the same maker, as the first is used.
A guy on the web says ""On-None-On" indicates there are only two rest
positions, making one connection or the other. " but again, the same
maker will have many other DT swtiches marked On-Off, so that's a little
hard to believe. Or is that false too, and None means the middle
position of the switch is not connected to the neon light in the switch,
but Off just means the other loads aren't connected?
I'm also wondering if there is a difference between
On-Off-(On) and On-Off-Mom ?
Is the second a new category for Mother's day? That's today, but I'm
pretty sure this catalog was printed years ago, since i've had it for
years. And again, Mom is used much less, but when it is used, it's
the same maker and the same section where (On) is used.
If one maker uses both terms, it seems like, in both cases here, they
might have different meanings, but I can't think of any.
mike
May 14, 2014, 7:00:22 PM5/14/14
to
On 5/14/2014 3:42 PM, micky wrote:
> I'm looking at the Mouser Electronics catalog, at DT rocker switches,
> and I'm wondering what the difference is between
>
> On-Off-On and On-None-On .
>
> The second is used much less, but, suprisingly, it's used in the same
> section, from the same maker, as the first is used.
>
> A guy on the web says ""On-None-On" indicates there are only two rest
> positions, making one connection or the other. " but again, the same
> maker will have many other DT swtiches marked On-Off, so that's a little
> hard to believe. Or is that false too, and None means the middle
> position of the switch is not connected to the neon light in the switch,
> but Off just means the other loads aren't connected?
>
>
> I'm also wondering if there is a difference between
>
> On-Off-(On) and On-Off-Mom ?
Mom is spring return.
> I'm looking at the Mouser Electronics catalog, at DT rocker switches,
> and I'm wondering what the difference is between
>
> On-Off-On and On-None-On .
>
> The second is used much less, but, suprisingly, it's used in the same
> section, from the same maker, as the first is used.
>
> A guy on the web says ""On-None-On" indicates there are only two rest
> positions, making one connection or the other. " but again, the same
> maker will have many other DT swtiches marked On-Off, so that's a little
> hard to believe. Or is that false too, and None means the middle
> position of the switch is not connected to the neon light in the switch,
> but Off just means the other loads aren't connected?
>
>
> I'm also wondering if there is a difference between
>
> On-Off-(On) and On-Off-Mom ?
William Sommerwerck
May 14, 2014, 8:53:03 PM5/14/14
to
I raised this issue sometime last year. The terminology can be confusing.
ON-OFF-ON means the switch has three positions. In the center position, none
of the contacts is closed.
An ON-(none)-ON switch is a regular DPDT switch. It has no central third
position.
Does this make sense?
ON-OFF-ON means the switch has three positions. In the center position, none
of the contacts is closed.
An ON-(none)-ON switch is a regular DPDT switch. It has no central third
position.
Does this make sense?
Phil Allison
May 15, 2014, 7:40:21 AM5/15/14
to
"micky"
>
> A guy on the web says ""On-None-On" indicates there are only two rest
> positions, making one connection or the other. " but again, the same
> maker will have many other DT swtiches marked On-Off, so that's a little
> hard to believe.
** "On-Off " indicates the switch has two contacts ( per pole) instead of
> A guy on the web says ""On-None-On" indicates there are only two rest
> positions, making one connection or the other. " but again, the same
> maker will have many other DT swtiches marked On-Off, so that's a little
> hard to believe.
three.
.... Phil
dave
May 15, 2014, 10:48:42 PM5/15/14
to
Arfa Daily
Jun 2, 2014, 9:06:22 PM6/2/14
to
"mike" <ham...@netzero.net> wrote in message
news:ll0sil$2gv$2...@dont-email.me...
> On 5/14/2014 3:42 PM, micky wrote:
>> I'm looking at the Mouser Electronics catalog, at DT rocker switches,
>> and I'm wondering what the difference is between
>>
>> On-Off-On and On-None-On .
>>
>> The second is used much less, but, suprisingly, it's used in the same
>> section, from the same maker, as the first is used.
>>
>> A guy on the web says ""On-None-On" indicates there are only two rest
>> positions, making one connection or the other. " but again, the same
>> maker will have many other DT swtiches marked On-Off, so that's a little
>> hard to believe. Or is that false too, and None means the middle
>> position of the switch is not connected to the neon light in the switch,
>> but Off just means the other loads aren't connected?
>>
>>
>> I'm also wondering if there is a difference between
>>
>> On-Off-(On) and On-Off-Mom ?
>
> Mom is spring return.
As far as I have always known, so is (On) ...
>> I'm looking at the Mouser Electronics catalog, at DT rocker switches,
>> and I'm wondering what the difference is between
>>
>> On-Off-On and On-None-On .
>>
>> The second is used much less, but, suprisingly, it's used in the same
>> section, from the same maker, as the first is used.
>>
>> A guy on the web says ""On-None-On" indicates there are only two rest
>> positions, making one connection or the other. " but again, the same
>> maker will have many other DT swtiches marked On-Off, so that's a little
>> hard to believe. Or is that false too, and None means the middle
>> position of the switch is not connected to the neon light in the switch,
>> but Off just means the other loads aren't connected?
>>
>>
>> I'm also wondering if there is a difference between
>>
>> On-Off-(On) and On-Off-Mom ?
>
> Mom is spring return.
Didn't we have this discussion on here a few months ago ? I seem to recall
that we didn't reach any firm conclusions except that the terms for switch
configurations that we have all known for the last 100 years or more seem to
be changing for no real reason other than the whim of certain manufacturers
?
Arfa
Arfa Daily
Jun 2, 2014, 9:12:11 PM6/2/14
to
"William Sommerwerck" <grizzle...@comcast.net> wrote in message
news:ll135n$6l9$1...@dont-email.me...
engineers know and understand ... :-(
Why change something that had perfectly well understood meaning, for
something open to debate and needing interpretation explanation ? Makes no
sense at all to me.
Arfa
William Sommerwerck
Jun 2, 2014, 9:27:28 PM6/2/14
to
"Arfa Daily" wrote in message news:Nh9jv.310727$aZ2.2...@fx07.am4...
for the "center" position -- even if it doesn't physically exist!
"William Sommerwerck" <grizzle...@comcast.net> wrote in message
news:ll135n$6l9$1...@dont-email.me...
news:ll135n$6l9$1...@dont-email.me...
>> ON-OFF-ON means the switch has three positions. In the
>> center position, none of the contacts is closed.
>> An ON-(none)-ON switch is a regular DPDT switch. It has
>> no central third position.
>> Does this make sense?
> Rather less than the 'proper' designation of SPDT or DPDT that
> most engineers know and understand ... :-(
Somebody must have decided that all toggle switches should have a designation
>> center position, none of the contacts is closed.
>> An ON-(none)-ON switch is a regular DPDT switch. It has
>> no central third position.
>> Does this make sense?
> Rather less than the 'proper' designation of SPDT or DPDT that
> most engineers know and understand ... :-(
for the "center" position -- even if it doesn't physically exist!
josephkk
Jun 7, 2014, 10:54:43 PM6/7/14
to
On Tue, 3 Jun 2014 02:06:22 +0100, "Arfa Daily" <arfa....@ntlworld.com>
wrote:
I suspect that really crappy translations are the primary cause of these
weirdness.
?-)
wrote:
weirdness.
?-)
William Sommerwerck
Jun 8, 2014, 9:06:09 AM6/8/14
to
"josephkk" wrote in message
news:mvj7p9ls07pgp7tro...@4ax.com...
> I suspect that really crappy translations are the primary cause
> of these weirdness.
No, these are from American catalogs selling (mostly) American-made switches.
"Someone" decided to change the way multi-throw switches are
labeled/designated.
news:mvj7p9ls07pgp7tro...@4ax.com...
> I suspect that really crappy translations are the primary cause
> of these weirdness.
"Someone" decided to change the way multi-throw switches are
labeled/designated.
quadrac...@gmail.com
Jun 19, 2018, 5:49:46 PM6/19/18
to
[mom] is momentary. it returns to [off] once you let go.
on-off can be make-before-break, which is sometimes super useful, sometimes super sketchy.
on-none-on clarifies that the switch is definitely break-before-make.
It only has two positions.
on-off-on is as previously mentioned.
not sure myself about the use of brackets;
eg off-(on) versus off-on
Methinks it could be [mom] notation
on-off can be make-before-break, which is sometimes super useful, sometimes super sketchy.
on-none-on clarifies that the switch is definitely break-before-make.
It only has two positions.
on-off-on is as previously mentioned.
not sure myself about the use of brackets;
eg off-(on) versus off-on
Methinks it could be [mom] notation
0 new messages