# RT Box 1: Max power/current **URL:** \ **Category:** RT Box\ **Tags:** rt-box\ **Created:** [October 21, 2020, 4:50am UTC](https://forum.plexim.com/t/rt-box-1-max-power-current/883 "2020-10-21T04:50:42Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mmsat](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@mmsat](https://forum.plexim.com/u/mmsat)\ **Post date:** [October 21, 2020, 4:50am UTC](https://forum.plexim.com/t/rt-box-1-max-power-current/883/1 "2020-10-21T04:50:42Z")
Is there any information about how much power/current the RT Box can output via the Digital Breakout Board? Digital pins have a resistance of about 250 Ohm, but I can’t find information about the VCC-Pins. ---
**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\ **Post date:** [October 21, 2020, 2:16pm UTC](https://forum.plexim.com/t/rt-box-1-max-power-current/883/2 "2020-10-21T14:16:37Z")
The Vcc of the Digital Breakout Board can be set to either +5V or +3.3V depending on the Vcc select jumper position. The +5V output is associated with Pin 19 of the Digital Input connector of the RT Box. If you look at the Digital Input Connector pinout table in the [RT Box manual](https://www.plexim.com/sites/default/files/rtboxmanual.pdf), you’ll see the rating of the output of 5V and 1.5A max. For the +3.3V output connection there is a small onboard buck converter that steps down the +5V output from the RT Box. The current rating of the +5V input is limiting. ---
**Author:** ![mmsat](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@mmsat](https://forum.plexim.com/u/mmsat)\ **Post date:** [October 26, 2020, 3:45am UTC](https://forum.plexim.com/t/rt-box-1-max-power-current/883/3 "2020-10-26T03:45:04Z")
Thanks alot!