RSTi‑EP power modules, sometimes called potential distribution or AUX modules, distribute 24‑V power to I/O modules within a station. They’re passive devices — no fieldbus interface — and snap onto DIN rails with spring‑style connections. Rated IP20 and V‑0, they’re suited for indoor industrial environments but need protection from moisture and dust. With up to 16 channels, they simplify wiring but add another component to purchase and maintain; integrated power distribution in a single backplane might reduce complexity.