# What is the contact gap of a basic switch?

**URL:** <https://forum.digikey.com/t/what-is-the-contact-gap-of-a-basic-switch/35366>\
**Category:** Switches\
**Tags:** switches, electromechanical, omron, faqs\
**Created:** [October 3, 2023, 7:36pm UTC](https://forum.digikey.com/t/what-is-the-contact-gap-of-a-basic-switch/35366 "2023-10-03T19:36:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![AaronRollens](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/aaronrollens/32/8752_2.png) [@AaronRollens](https://forum.digikey.com/u/AaronRollens)\
**Post date:** [October 3, 2023, 7:36pm UTC](https://forum.digikey.com/t/what-is-the-contact-gap-of-a-basic-switch/35366/1 "2023-10-03T19:36:49Z")

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### Question:

What is the contact gap of a basic switch?

![Block](https://global.discourse-cdn.com/digikey/original/3X/5/5/55dcf4301ea7c5ffe6276999c26abe879bc7edff.png)

### Answer:

The contact gaps for Omron’s basic switches are as follows:  
V size: F gap / 1 mm / Standard value  
S size: G gap / 0.5 mm / We also have F gap limited to NC specifications.  
J size: H gap / 0.25 mm

![Block](https://global.discourse-cdn.com/digikey/original/3X/5/5/55dcf4301ea7c5ffe6276999c26abe879bc7edff.png)

### Explanation:

The contact gap of a basic switch is determined largely based on its size. A larger contact gap is advantageous for withstanding voltage and DC cutoff, while a smaller contact gap is advantageous for repeatability of detection and electrical durability. In recent years, demand for a large contact gap has been increasing to withstand voltage requirements and power supply interruptions (primary and secondary), even in small sizes. A 1 mm gap variation has also been added to SS models.

 ![image](https://global.discourse-cdn.com/digikey/original/3X/e/6/e60750b4ec3a6e478aa347433a0577dec3a4da9d.png)

![Block](https://global.discourse-cdn.com/digikey/original/3X/5/5/55dcf4301ea7c5ffe6276999c26abe879bc7edff.png)

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#### Product category

Switches Basic Switches

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#### Classification

Selection, Characteristics

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#### Related keywords

Basic Switch  
Contact Gap  
F Gap  
G Gap  
H Gap  
Repeatability of Detection

![Block](https://global.discourse-cdn.com/digikey/original/3X/5/5/55dcf4301ea7c5ffe6276999c26abe879bc7edff.png)

Please visit the link below to see this product category on the Digi-Key website  
[Switches | DigiKey Electronics](https://www.digikey.com/en/products/category/switches/15)

  

This FAQ has been brought to you courtesy of

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Please click the link below to view the original FAQ

[https://components.omron.com/us-en/faq/switches/FAQE20017](https://components.omron.com/us-en/faq/switches/FAQE20017)