Turn the Instant Pot onto the high saute setting and melt the butter.
Brown the Brats on all sides in the melted butter and remove to a plate.
Add the sliced bell peppers, sliced onion to the Instant Pot and saute for about 3-4 minutes.
Push the warming/cancel button to turn off the saute setting.
Return the brats to the Instant Pot. Add the beer to the Instant Pot. Place the lid on the Instant Pot and set the valve to the sealing position.
Push the manual or pressure button and set the timer for 6 minutes.
When the timer goes off allow the Instant Pot to naturally release
Carefully open the lid to the Instant Pot away from you
Serve the Brats on Rolls and top with peppers and onions.