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What does an "ON-(ON)" switch mean??

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Oznog

Active Member
I'm looking through Mouser for a SPST latching pushbutton switch. Click on, click off power.

I see them listed as:
"()= Momentary"
OFF-(ON)
ON-(OFF)
OFF-ON
ON-(ON)
ON-ON
ON-OFF

OK the first three I think I get. "OFF-(ON) normally off and momentarily on, right? Then "OFF-ON" would mean latching?

But by that same line of thinking, "ON-(ON)" would be normally on then momentarily on, which sounds like nonsense, as does "ON-ON". "ON-OFF" would be the same as "OFF-ON" too, the 2 latching states appear identical for a button.

Am I interpreting this correctly at all? What do "ON-(ON)", "ON-ON", and "ON-OFF" mean??
 

ericgibbs

Well-Known Member
Most Helpful Member
This may help.:)

https://www.kpsec.freeuk.com/components/switch.htm


EDIT:


Am I interpreting this correctly at all? What do "ON-(ON)", "ON-ON", and "ON-OFF" mean??

The (ON) brackets mean the toggle is spring loaded and has to be held this position to operate the switch, releasing the switch it will jump back to the previous position.

So ON-(ON) means that
if the toggle/lever is in the ON position the switch is latched ON
if the toggle/lever is HELD in the (ON) position the switch is ON while pressed.

ON-ON means
if the toggle/lever is in either of the ON positions the switch is latched ON

ON-OFF means
if the toggle/lever is in the ON positions the switch is latched ON
if the toggle/lever is in the OFF positions the switch is latched OFF
 
Last edited:

geko

Active Member
ON-ON would be have three terminals, common and two switched, when one is on the other is off and vice versa. (single pole, double throw)

ON-OFF would have two terminals, so it's either on or off (single pole, single throw)

ON-(ON) the switch doesn't latch in the second position. The (ON) requires someone to hold the switch and it will switch back to ON when they let go. (single pole, double throw, non-latching)
 

rezer

New Member
To me, it's simpler to think of the brackets as a momentary position.
 
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