# What is a potential free contact? **URL:** \ **Category:** Electrical\ **Tags:** electrical\ **Created:** [February 26, 2021, 5:57am UTC](https://forumautomation.com/t/what-is-a-potential-free-contact/9203 "2021-02-26T05:57:12Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![instrumentationtechi](https://forumautomation.com/letter_avatar_proxy/v4/letter/i/50afbb/32.png) [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\ **Post date:** [February 26, 2021, 5:57am UTC](https://forumautomation.com/t/what-is-a-potential-free-contact/9203/1 "2021-02-26T05:57:12Z")
Explain the potential free contact ---
**Author:** ![ashlin](https://forumautomation.com/user_avatar/forumautomation.com/ashlin/32/3775_2.png) [@ashlin](https://forumautomation.com/u/ashlin)\ **Post date:** [February 26, 2021, 6:00am UTC](https://forumautomation.com/t/what-is-a-potential-free-contact/9203/2 "2021-02-26T06:00:31Z")
Potential free contact means, Dry contact that has a voltage-free contact .relay, limit switch contact is a potential-free contact. There will be no Power supply to energize the Output devices (digital output signal) from the DCS panel. Relay control supply on instrument signal card and common supply to NC or NO will be from Electrical panel. That’s why it can be called a potential free contact **Eg:** Motor start/stop signal > ### You can also follow us on [**AutomationForum.co**](https://automationforum.co/), [**Facebook**](https://www.facebook.com/instrumentation.control) and [**Linkedin**](https://www.linkedin.com/showcase/81532759/feed/posts/) to receive daily Instrumentation updates. > ### You can also follow us on [**ForumElectrical.com**](https://forumelectrical.com/), [**Facebook**](https://www.facebook.com/profile.php?id=100091841583670) and [**Linkedin**](https://www.linkedin.com/showcase/91130242/feed/posts/) to receive daily Electrical updates.