# A three way switch with momentary on

**URL:** <https://lookmumnocomputer.discourse.group/t/a-three-way-switch-with-momentary-on/696>\
**Category:** KOSMO MODULES\
**Created:** [April 22, 2020, 12:08pm UTC](https://lookmumnocomputer.discourse.group/t/a-three-way-switch-with-momentary-on/696 "2020-04-22T12:08:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Fremen](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fremen/32/1632_2.png) [@Fremen](https://lookmumnocomputer.discourse.group/u/Fremen)\
**Post date:** [April 22, 2020, 12:08pm UTC](https://lookmumnocomputer.discourse.group/t/a-three-way-switch-with-momentary-on/696/1 "2020-04-22T12:08:43Z")

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Rapid order code 75-0152

I looked at the topics here in this sub forum and can’t remember it but someone drew a diagram where they had a three way (on, off, on) switch and one of the on switches had a push switch in line to one of the on switches as they wanted a momentary on.

At work we use SCI high current mains switches that turn pumps and motors on, we don’t use the momentary on switch but they can be found on rapid here. I remember when the on-off-on switch we had was discontinued and I learned that (on) means momentary on when sourcing a compatible replacement.

> **[SCI TA105A1 Mini Toggle Switch SPDT On/off(on)](https://www.rapidonline.com/sci-ta105a1-mini-toggle-switch-spdt-on-off-on--75-0152)**
>
> SCI - TA105A1 - SCI TA105A1 Mini Toggle Switch SPDT On/off(on) - Buy Miniature Toggle Switch SPDT On-Off-(On) from SCI – a low cost panel mounting

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**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\
**Post date:** [April 22, 2020, 12:11pm UTC](https://lookmumnocomputer.discourse.group/t/a-three-way-switch-with-momentary-on/696/2 "2020-04-22T12:11:21Z")

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@dud posted a sketch here:

> [@Mini adsr switch trick](https://lookmumnocomputer.discourse.group/t/mini-adsr-switch-trick/655):
>
> Nothing revolutionary but can maybe helped some. For those like me who build this module with a stripborad or at least a diy panel this is a little trick for the cursed switch! a normal switch (on / off / on not momentary) + a push switch button for manual trigger that’s how i did it [Sans titre]