The Helios M 3 is a relay switch combined with a full protection unit designed specifically for two-speed three-phase fans equipped with integrated thermal contacts. It comes in a robust light grey polymer housing rated to IP55, suitable for surface installation in various industrial and commercial environments. The device is operated using a 3‑step switch labeled “0−1−2” to control fan speeds and includes a control lamp indicating operational status. Following a fault, the unit requires manual reset by switching to position “0” to ensure safe and reliable operation.