# Switch function

**URL:** <https://forum.digikey.com/t/switch-function/68513>\
**Category:** Q&A\
**Created:** [May 2, 2026, 6:03pm UTC](https://forum.digikey.com/t/switch-function/68513 "2026-05-02T18:03:44Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![greggk47](https://avatars.discourse-cdn.com/v4/letter/g/b487fb/32.png) [@greggk47](https://forum.digikey.com/u/greggk47)\
**Post date:** [May 2, 2026, 6:03pm UTC](https://forum.digikey.com/t/switch-function/68513/1 "2026-05-02T18:03:44Z")

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------Question for CR102J3RS215QF7 Please Put your question below------

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**Author:** ![PaulHutch](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/paulhutch/32/3357_2.png) [@PaulHutch](https://forum.digikey.com/u/PaulHutch)\
**Post date:** [May 4, 2026, 11:30am UTC](https://forum.digikey.com/t/switch-function/68513/2 "2026-05-04T11:30:42Z")

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It’s SPST

[https://www.digikey.com/en/products/detail/c-k/CR102J3RS215QF7/566785](https://www.digikey.com/en/products/detail/c-k/CR102J3RS215QF7/566785)

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**Author:** ![Irfan\_Koric](https://avatars.discourse-cdn.com/v4/letter/i/3d9bf3/32.png) [@Irfan\_Koric](https://forum.digikey.com/u/Irfan_Koric)\
**Post date:** [May 4, 2026, 12:08pm UTC](https://forum.digikey.com/t/switch-function/68513/3 "2026-05-04T12:08:13Z")

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Hello **[greggk47](https://forum.digikey.com/u/greggk47)**,

Welcome to the DigiKey TechForum.

As Paul said, this CR102J3RS215QF7 is a basic ON-OFF single pole single throw switch.

Regards.

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<div class="post-metadata">

**Author:** ![greggk47](https://avatars.discourse-cdn.com/v4/letter/g/b487fb/32.png) [@greggk47](https://forum.digikey.com/u/greggk47)\
**Post date:** [May 4, 2026, 5:41pm UTC](https://forum.digikey.com/t/switch-function/68513/4 "2026-05-04T17:41:48Z")

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My inquiry is, will the switch light up when turned on? I previously bought a switch on PO REDACTED, and when I installed and turned it on, the switch lit up momentarily, then the light burned out. I’m using it on a 120V power source.

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**Author:** ![Kristof\_2649](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/kristof_2649/32/2325_2.png) [@Kristof\_2649](https://forum.digikey.com/u/Kristof_2649)\
**Post date:** [May 4, 2026, 5:57pm UTC](https://forum.digikey.com/t/switch-function/68513/5 "2026-05-04T17:57:24Z")

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You can wire it up with input Line Voltage connected to terminal 2 so the illumination is always on or you can wire it up with input line voltage connected to terminal 1 so that the illumination is only on when the switch is closed.

 ![image](https://global.discourse-cdn.com/digikey/original/3X/3/e/3e41dfd40430e5a8ea3cc909871e521567119305.png)

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**Author:** ![rick\_1976](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/rick_1976/32/1571_2.png) [@rick\_1976](https://forum.digikey.com/u/rick_1976)\
**Post date:** [May 4, 2026, 6:14pm UTC](https://forum.digikey.com/t/switch-function/68513/6 "2026-05-04T18:14:48Z")

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> [@greggk47](#):
>
> when I installed and turned it on, the switch lit up momentarily, then the light burned out.

The typical cause of this behavior is a failure to note that the illumination voltage and rated contact voltage often differ. A switch such as P/N [CW103-ND](https://www.digikey.com/en/products/detail/cw-industries/GRB112B802BR1/2349683) for example can be used to switch 120VAC, but the illumination source is designed for 12VDC.

 ![image](https://global.discourse-cdn.com/digikey/original/3X/d/9/d961742c81e58d5ee25ee687f67b6f6d621fe9ce.png)

P/N CR102J3RS215QF7 by comparison indicates a nominal illumination voltage of 125VAC.