# What is difference between ELR and EFR.....?

**URL:** <https://forumautomation.com/t/what-is-difference-between-elr-and-efr/173>\
**Category:** Electrical\
**Created:** [November 29, 2014, 7:21am UTC](https://forumautomation.com/t/what-is-difference-between-elr-and-efr/173 "2014-11-29T07:21:00Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![automate](https://forumautomation.com/letter_avatar_proxy/v4/letter/a/51bf81/32.png) [@automate](https://forumautomation.com/u/automate)\
**Post date:** [November 29, 2014, 7:21am UTC](https://forumautomation.com/t/what-is-difference-between-elr-and-efr/173/1 "2014-11-29T07:21:01Z")

</div>

What is the difference between ELR and EFR and how they can be selected for different applications…?

---

<div class="post-metadata">

**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [November 29, 2014, 7:23am UTC](https://forumautomation.com/t/what-is-difference-between-elr-and-efr/173/2 "2014-11-29T07:23:00Z")

</div>

ELR means earth leakage relay or earth leakage circuit breaker, and EFR means earth fault relay. Both are protective relays. ELR will prevent shocks from circuit and protect life and EFR will protect transformers from fault current.Most of the EFR are IDMT type relays ie Inverse Definite Minimum Time.

> ### 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.