The DNT Rauhelleren Mountain Station is a full-board hostel during the season, where you can sleep and get at least breakfast and dinner. It's also a great place to take a break. According to the DNT website (ut.no/kart), there's also a self-catering cabin next to the mountain station. I personally assume that this is only open between seasons (winter/summer) and that the hut owners may also use it for overnight stays during the season. Therefore, you should also carry a DNT key with you during the off-season to access the cabins and restrooms.
Great cabin with friendly staff; the prices are reasonable by Norwegian standards. Due to the coronavirus pandemic, reservations are currently required via email, and only the half-board package is available. However, it's recommended because you can enjoy a good dinner after a strenuous day and prepare some sandwiches for the journey at breakfast. Many dishes are locally produced and homemade. My tip: try the creamed herring at breakfast!
Rauhelleren is a beautiful and well-equipped hut on the Hardangervidda plateau. It's within a day's hike of several other huts, making it perfect for a hut-to-hut tour.