# Are relay shields safe?

**URL:** <https://forum.arduino.cc/t/are-relay-shields-safe/916632>\
**Category:** General Guidance\
**Created:** [October 20, 2021, 11:24am UTC](https://forum.arduino.cc/t/are-relay-shields-safe/916632 "2021-10-20T11:24:34Z")\
**Posts on this page:** 1\
**Showing post:** 5

<div class="post-metadata">

**Author:** ![mario26](https://avatars.discourse-cdn.com/v4/letter/m/dec6dc/32.png) [@mario26](https://forum.arduino.cc/u/mario26)\
**Post date:** [October 20, 2021, 12:02pm UTC](https://forum.arduino.cc/t/are-relay-shields-safe/916632/5 "2021-10-20T12:02:41Z")

</div>

Thank for the response Paul.  
I might have not explained myself clearly.  
I think that my question is just if it is safe to power the relays just using my Arduino board, or do I need an external power supply as it is described in [this discussion](https://forum.arduino.cc/t/relay-jd-vcc-connection/451820/5).  
How dangerous is it not to use an external power supply for powering the relays?

---

_[View the full topic](https://forum.arduino.cc/t/are-relay-shields-safe/916632)._